具体实施方式：
[0022]The subject disclosure is now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding thereof. It may be evident, however, that the subject disclosure can be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate a description thereof.
[0023]As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless specified otherwise, or clear from the context, the phrase “X employs A or B” is intended to mean any of the natural inclusive permutations. That is, the phrase “X employs A or B” is satisfied by any of the following instances: X employs A; X employs B; or X employs both A and B. In addition, the articles “a” and “an” as used in this application and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from the context to be directed to a singular form.
[0024]Furthermore, the term “set” as employed herein excludes the empty set; e.g., the set with no elements therein. Thus, a “set” in the subject disclosure includes one or more elements or entities. As an illustration, a set of controllers includes one or more controllers, etc. Likewise, the term “group” as utilized herein refers to a collection of one or more entities; e.g., a group of nodes refers to one or more nodes, etc.
[0025]Various aspects or features will be presented in terms of systems that may include a number of devices, components, modules, layers, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, layers etc. and/or may not include all of the devices, components, modules, layers, etc. discussed in connection with the figures. A combination of these approaches also can be used.
[0026]An optical sensor (e.g., industrial sensor, photoelectric sensor, proximity sensor, etc.) can generate a beam of light to, for example, detect distance, presence or absence of an object. Optical sensors typically contain a light-emitting diode (LED) or a laser diode behind a lens. Light emitted from the LED can then be projected through the lens to generate a beam of light employed to detect distance, presence or absence of an object. However, it is often difficult to align an optical beam associated with a conventional optical sensor (e.g., tolerances associated with conventional optical sensors are difficult to achieve). Furthermore, a light source associated with a conventional optical sensor can only be employed for a single purpose (e.g., to generate a beam of light).
[0027]To address these and other issues, one or more embodiments of the present disclosure providing an auxiliary light source in an optical assembly (e.g., an optical assembly associated with an optical sensor) and/or an industrial automation indicator. The auxiliary light source can facilitate improved alignment and/or tolerances associated with optical sensors (e.g., tolerance stack up can be reduced to provide closer alignment between an optical beam and a physical package of an optical sensor). Furthermore, the auxiliary light source can be less dependent on mechanical stack-up tolerances of existing optical sensors, optical beam wander can be reduced, LED location tolerances with respect to an optical system can be improved, a uniform and/or controlled illumination on a target can be generated, etc. The auxiliary light source can also provide flexibility for use in multiple industrial applications (e.g., industrial automation applications, industrial lighting applications, industrial instrumentation applications, etc.).
[0028]In an aspect, fluorophore can be applied to a substrate (e.g., a clear substrate, a transparent substrate, a translucent substrate, etc.) to form an auxiliary light source (e.g., a luminescent label comprising fluorophore). In one example, the substrate can be a rigid substrate. In another example, the substrate can be a flexible substrate. The auxiliary light source (e.g., fluorophore of luminescent label) can be energized in response to a light source (e.g., light emitted by an LED) to provide another light source for sourcing associated with an optical sensor (e.g., for detecting distance, presence or absence of an object, etc.). Additionally, auxiliary light source (e.g., fluorophore of luminescent label) can be energized in response to a light source (e.g., light emitted by an LED) to provide another light source for indication purposes (e.g., light indicators, instrumentation, signage, indication of certain operating parameters, etc.) associated with industrial equipment (e.g., industrial automation equipment).
[0029]FIG. 1 illustrates an example system 100 for employing an auxiliary light source associated with an optical assembly. System 100 includes an optical assembly 102 (e.g., optical component 102, optical unit 102, optical device 102, etc.) and a luminescent label 104 (e.g., a fluorescent label 104, a fluorophore label 104, etc.). The optical assembly 102 can support a lens 106. The lens 106 can be associated with one or more lenses for projecting light from the optical assembly 102. In one example, the optical assembly 102 and the lens 106 can be associated with an optical sensor (e.g., a photoelectric sensor, a proximity sensor, an industrial sensor, etc.). The luminescent label 104 can include at least fluorophore (e.g., one or more fluorophores). The fluorophore of the luminescent label 104 can be applied to (e.g., printed onto, attached to, embedded within, etc.) a substrate of the luminescent label 104. For example, the luminescent label 104 can comprise fluorophore printed onto a substrate. The substrate of the luminescent label 104 can be a rigid substrate to support the fluorophore. Alternatively, the substrate of the luminescent label 104 can be a flexible substrate to support the fluorophore. The substrate of the luminescent label 104 can be a clear substrate or a translucent substrate (e.g., the fluorophore can be printed onto a transparent or translucent substrate of the luminescent label 104). Alternatively, the fluorophore can be printed directly onto a pressure sensitive adhesive of the luminescent label 104. Fluorophore inks can be printed onto the luminescent label 104 via one or more printing processes and/or one or more deposition processes. The luminescent label 104 (e.g., the substrate of the luminescent label 104) can be round, a square, a rectangular, or another type of geometry.
[0030]The luminescent label 104 can be attached to the optical assembly 102. For example, the luminescent label 104 can be attached to an outer optical shroud of the optical assembly 102. Alternatively, the luminescent label 104 can be attached to an inner optical shroud of the optical assembly 102. In one implementation, the luminescent label 104 can be attached to the optical assembly 102 (e.g., an optical shroud of the optical assembly) via a mechanical technique. For example, the substrate of the luminescent label 104 that includes the fluorophore can be mechanically attached to the optical assembly. Additionally or alternatively, the luminescent label 104 can be attached to the optical assembly 102 via a pressure sensitive adhesive. The fluorophore can be applied, for example, to a first side of the substrate and a pressure sensitive adhesive can be applied, for example, to a second side of the substrate. Therefore, the substrate of the luminescent label 104 that includes the fluorophore can be attached (e.g., bonded, joined, etc.) to the optical assembly via the pressure sensitive adhesive. In yet another implementation, the luminescent label 104 can be attached to the optical assembly 102 during an injection molding process associated with the optical assembly 102. In an implementation where the luminescent label 104 does not include a substrate, a pressure sensitive adhesive of the luminescent label 104 that includes the fluorophore can be applied directly to the optics assembly 102.
[0031]In an implementation, the luminescent label 104 can be associated with an aperture 112 of the optical assembly 102 (e.g., the luminescent label 104 can cover an aperture of the optical assembly 102). The aperture 112 of the optical assembly 102 can be a round aperture, a square aperture, a rectangular aperture, or an aperture with a different geometry. Accordingly, the luminescent label 104 can be attached to an aperture plane of the optical assembly 102. However, it is to be appreciated that the luminescent label 104 can alternatively be attached to a natural focal plane of the optical assembly 102.
[0032]The luminescent label 104 can generate output light 110 in response to light 108 received from a light source (e.g., fluorophore of the luminescent label 104 can be illuminated in response to the light 108 received from the light source). For example, the fluorophore of the luminescent label 104 can be a fluorophore chemical compound that can emit light (e.g., the output light 110) in response to the light 108 received from the light source. The luminescent label 104 can emit the output light 110 at a specific wavelength. A wavelength associated with the output light 110 can be different than a wavelength associated with the light 108. For example, the fluorophore of the luminescent label 104 can absorb the light 108 associated with a particular wavelength (e.g., a particular color) and can re-emit the light 108 as the light 110 associated with a longer wavelength (e.g., a different color). The light source (e.g., an excitation light source for the luminescent label 104) that generates the light 108 can be a light-emitting diode (LED). For example, the light source can be, but is not limited to, a blue LED excitation source, an ultraviolet (UV) LED excitation source, a white LED excitation source, another type of LED excitation source, etc. Alternatively, the light source can be a laser (e.g., a laser diode), a phosphor emitter light source (e.g., a remote phosphor emitter light source), a solid state light source (e.g., a solid state electrical to optical light source), or another type of light source. In an implementation, the optical assembly 102, the luminescent label 104, and the light source that generates the light 108 can be associated with (e.g., located in) a common component (e.g., an optical sensor). The light source that generates the light 108 can be located behind the luminescent label 104. Alternatively, the light source that generates the light 108 can be located underneath the luminescent label 104. Alternatively, the light source that generates the light 108 can be in a different location to cause the fluorophore to fluoresce (e.g., the light 108 can be received from an alternate side of the luminescent label 104 associated with the lens 106 and can be projected back through the lens 106 as the output light 110, etc.). In another implementation, the light source can be a remote light source. For example, the optical assembly 102 and the luminescent label 104 can be associated with a particular component (e.g., an optical sensor), and the light source can be implemented separate from the particular component (e.g., the optical sensor).
[0033]Illumination of the luminescent label 104 by the light 108 (e.g., light 108 generated by the light source) can result in fluorophore of the luminescent label 104 fluorescing into a particular color or set of colors (e.g., fluorophore of the luminescent label 104 generating the output light 110 that is associated with a particular color or set of colors). Color associated with the output light 110 can be different than color associated with the light 108. For example, the light 108 can be associated with a first color and the output light 110 can be associated with at least a second color (e.g., the luminescent label 104 can transform a color associated with the light 108). Furthermore, fluorophore of the luminescent label 104 can allow the output light 110 (e.g., a light beam of the output light 110) to be more uniform (e.g., better directed) than the light 108. Uniformity of the output light 110 (e.g., light emission of the luminescent label 104) can be controlled by the deposition process and/or the printing process employed to apply the fluorophore to the substrate.
[0034]In response to the output light 110 being generated by the luminescent label 104 (e.g., light emission of the luminescent label 104), the lens 106 can project the output light 110. Optical shroud of the optical assembly 102 can maintain the output light 110 within the optical assembly 102 so that the lens 106 can project the output light 110. In one example, the lens 106 can be implemented as an emitter lens of an optical sensor (e.g., a photoelectric sensor, a proximity sensor, an industrial sensor, etc.). An optical sensor can comprise, for example, at least the optical assembly 102 and the lens 106. Therefore, in an aspect, the output light 110 generated by the luminescent label 104 and projected by the lens 106 can be output light of an optical sensor. In one example, the output light 110 project by the lens 106 can be projected as a stationary beam of light. Alternatively, the output light 110 project by the lens 106 can be projected in an oscillatory manner to sweep across a viewing area to be monitored by an optical sensor. The output light 110 project by the lens 106 can be a pulsed beam of light (e.g., a modulated beam of light) or a beam of light that is not pulsed (e.g., not modulated).
[0035]In an implementation, the optical assembly 102 (e.g., the optical assembly and the lens 106) can be associated with a two-dimensional (2D) imaging sensor. A 2D imaging sensor that comprises at least the optical assembly 102 can be used, for example, to detect and identify shape and/or surface characteristics of objects within a viewing field. In another implementation, the optical assembly 102 can be associated with a three-dimensional (3D) imaging sensor (e.g., time-of-flight (TOF) sensor). A 3D imaging sensor that comprises at least the optical assembly 102 can be used, for example, to determine distance information and/or 2D shape information for objects and surfaces within a viewing field. The lens 106 can project the output light 110 toward a viewing area to be monitored. Accordingly, the output light 110 generated by the luminescent label 104 can be emitted from the lens 106 (e.g., an emitter lens) to facilitate detecting distance, presence and/or absence of an object within a viewing field.
[0036]In an aspect, the output light 110 generated by the luminescent label 104 can comprise a code (e.g., a color code). For example, ratios of wavelengths associated with the output light 110 generated by the luminescent label 104 can form a code. Therefore, the output light 110 generated by the luminescent label 104 can be associated with a ratio of emission wavelengths. The code associated with the output light 110 can be a unique code (e.g., a unique color code) determined by the fluorophore of the luminescent label 104. For example, a ratio associated with the output light 110 can be defined by a fluorophore composition (e.g., a fluorophore dopant composition) of the luminescent label 104 (e.g., a fluorophore composition determined by printing fluorophore on the substrate). In one implementation, fluorophore of the luminescent label 104 can be configured to emit timing signals (e.g., slewed timing signals) based on a light source that generates the light 108. The code associated with the output light 110 generated by the luminescent label 104 can reduce noise associated with other sensors and/or other devices (e.g., parasitic talk and/or cross talk from other sensors in an environment). The code associated with the output light 110 can include, but is not limited to, an authentication code (e.g., a product authentication code), a date code, a location code (e.g., a manufacturing location code), a wavelength bar code, a time of flight (ToF) code, another type of code, etc.
[0037]The luminescent label 104 can provide a way to generate any light color and/or wavelength that can be used as an excitation source for the optical assembly 102 (e.g., an optical sensor). The luminescent label 104 also provides a way to standardize a set of LED types in inventory while allowing for greater functionality of an optical sensor. For example, rather than maintaining a large quantity of LEDs in inventory and/or changing LEDs of an optical sensor to attain certain design criteria, a single LED can be employed by an optical sensor and/or different design criteria can be attained by changing design of a luminescent label 104. This consolidation in part inventory (e.g., LED inventory) can provide reduction in purchases and/or costs. Furthermore, the luminescent label 104 can provide improved detection of distance, presence or absence of an object and/or improved color sensing.
[0038]FIG. 2 illustrates an example luminescent label 200 (e.g., a side-view of an example luminescent label 200). The luminescent label 200 can be associated with an industrial application (e.g., an optical sensor, industrial equipment, industrial automation equipment, industrial indicators, industrial instrumentation, etc.). In one example, the luminescent label 200 can correspond to the luminescent label 104 shown in FIG. 1. However, it is to be appreciated that the luminescent label 200 can be implemented separate from the system 100 (e.g., for indication purposes associated with industrial automation equipment, etc.). In the embodiment shown in FIG. 2, the luminescent label 200 includes a fluorophore layer 202 (e.g., a fluorophore-based layer 202), a substrate layer 204 and a pressure sensitive adhesive (PSA) layer 206. However, it is to be appreciated that the luminescent label 200 can be implemented without the PSA layer 206. The fluorophore layer 202 can be applied to the substrate layer 204. For example, the fluorophore layer 202 can be printed onto the substrate layer 204 via one or more printing processes and/or one or more deposition processes. The fluorophore layer 202 can cover at least a portion of a surface of the substrate layer 204. For example, the fluorophore layer 202 can cover a portion of a surface of the substrate layer 204 and another portion of the surface of the substrate layer 204 can be uncovered. In another example, the fluorophore layer 202 can cover an entire surface of the substrate layer. A first surface of the substrate layer 204 can be associated with the fluorophore layer 202 and a second surface of the substrate layer 204 can be associated with the PSA layer 206. Alternatively, the fluorophore layer 202 can be applied directly onto the PSA layer 206. For example, the luminescent label 200 can be implemented without the substrate layer 204. In another example, the fluorophore layer 202 can be applied to a first surface of the PSA layer 206 and a second surface of the PSA layer 206 can be applied to the substrate 204.
[0039]The fluorophore layer 202 can comprise fluorophore (e.g., fluorophore chemical compound(s)). The fluorophore layer 202 can receive the light 108 (e.g., the light 108 generated by a light source) and can transform the light into the output light 110. For example, the fluorophore layer 202 can comprise one or more types of fluorophore that can emit the output light 110 in response to the light 108. The output light 110 can comprise a different wavelength than the light 108. In certain implementations, the substrate 204 and/or the PSA layer 206 can alternatively receive the light 108 and the fluorophore layer 202 can transmit the output light 110 from a surface of the fluorophore layer 202 that is not associated with the substrate 204 and/or the PSA layer 206. For example, the luminescent label 200 can alternatively be oriented so the light 108 passes through the luminescent label 200 in an opposite direction to what is shown in FIG. 2. It is to be appreciated that composition and/or properties of the fluorophore associated with the fluorophore layer 202 (e.g., fluorophore dye composition and/or properties) can be varied to generate a particular type of output light 110. The substrate layer 204 can be a clear (e.g., transparent, etc.) substrate layer. Alternatively, the substrate layer 204 can be a translucent (e.g., hazy, etc.) substrate layer. Furthermore, the substrate layer 204 can be a rigid substrate layer. Alternatively, the substrate layer 204 can be a flexible substrate layer. The substrate layer 204 can comprise a clear material, such as but not limited to, clear acrylic, a transparent thermoplastic, a clear glass, another type of transparent material, etc. Alternatively, the substrate layer 204 can comprise a translucent material, such as but not limited to, translucent acrylic, a translucent thermoplastic, translucent glass, another type of translucent material, etc. The substrate layer 204 can provide stability for the fluorophore layer 202 (e.g., fluorophore printed on the substrate layer 204). The PSA layer 206 can be, for example, a flexible pressure sensitive adhesive layer.
[0040]In an implementation, the output light 110 generated by the fluorophore layer 202 (e.g., the luminescent label 104) can be received by the optical assembly 102 and projected by the lens 106. For example, the luminescent label 200 (e.g., luminescent label 104) can be attached to the optical assembly 102 (e.g., an aperture plane of the optical assembly 102). In one example, the PSA layer 206 (e.g., an outer surface of the PSA layer 206) can be adhered to the optical assembly 102. Additionally or alternatively, the substrate layer 204 can be mechanically affixed to the optical assembly 102. A width of the fluorophore layer 202, in one example, can correspond (e.g., approximately correspond) to a width of the aperture 112 of the optical assembly 102. In another example, a width of the fluorophore layer 202 can be smaller or larger than a width of the aperture 112 of the optical assembly 102. A width of the substrate layer 204 can be larger than a width of the aperture 112 of the optical assembly 102 so that the aperture 112 is covered (e.g., completely covered) by at least a portion of the luminescent label 200. For example, a width of the substrate layer 204 can correspond (e.g., approximately correspond) to a width of a base of the optical assembly 102. In an implementation, the output light 110 generated by the fluorophore layer 202 (e.g., the luminescent label 200) can alternatively be received by an indicator associated with industrial equipment (e.g., industrial automation equipment, industrial instrumentation, industrial lighting, industrial indicators, etc.). The luminescent label 200 can be employed, for example, as a light source for indicator lights and/or signage associated with industrial equipment.
[0041]FIG. 3 illustrates an example luminescent label 300 (e.g., a side-view of an example luminescent label 300). The luminescent label 300 can be associated with an industrial application (e.g., an optical sensor, industrial equipment, industrial automation equipment, industrial indicators, industrial instrumentation, etc.). In one example, the luminescent label 300 can correspond to the luminescent label 104 shown in FIG. 1. However, it is to be appreciated that the luminescent label 300 can be implemented separate from the system 100 (e.g., for indication purposes associated with industrial automation equipment, etc.). In the embodiment shown in FIG. 3, the luminescent label 300 includes the fluorophore layer 202, the substrate layer 204 and/or the PSA layer 206. Additionally, the luminescent label 300 includes a mask layer 302 (e.g., an opaque layer 302). The fluorophore layer 202 and the mask layer 302 can be applied to the substrate layer 204. The mask layer 302 can be associated with one or more opaque printing inks that are applied to the substrate layer 204 (e.g., printed on the substrate layer 204) via one or more printing processes and/or one or more deposition processes. Alternatively, the fluorophore layer 202 can be applied directly to the pressure sensitive adhesive layer 206 and/or the luminescent label 300 can be implemented without the substrate layer 204.
[0042]The mask layer 302 can be applied to the substrate layer 204 in addition to the fluorophore layer 202 so that the light 108 is not emitted through the substrate layer 204 (e.g., so that only the output light 110 generated by the fluorophore layer 202 is emitted by the luminescent label 300, to block the light 108, etc.). For example, the mask layer 302 can be applied to the substrate layer 204 where the fluorophore layer 202 is not applied to the substrate layer 204 (e.g., in order to fully cover the aperture 112 of the optic assembly 102 with the fluorophore layer 202 and the mask layer 302). Alternatively, the fluorophore layer 202 can be applied to the mask layer 302 (e.g., printed on top of the mask layer 302 to cover at least a portion of the mask layer 302). Accordingly, only an area of the fluorophore layer 202 exposed to the lens 106 will be projected. In certain implementations, the luminescent label 300 can alternatively be oriented so the light 108 passes through the luminescent label 300 (and the output light 110 is projected in) an opposite direction to what is shown in FIG. 3.
[0043]In one example, the mask layer 302 can provide an opaque border for the fluorophore layer 202. In another example, the fluorophore layer 202 can be interposed between the mask layer 302 (e.g., a first portion of the mask layer 302 and a second portion of the mask layer 302). However, it is to be appreciated that the mask layer 302 can be applied to the substrate layer 204 based on design criteria of a particular implementation. By implementing the mask layer 302, noise associated with other light (e.g., cross talk associated with other sensors in an environment) can also be reduced.
[0044]FIG. 4 illustrates an example luminescent label 400 (e.g., a side-view of an example luminescent label 400). The luminescent label 400 can be associated with an industrial application (e.g., an optical sensor, industrial equipment, industrial automation equipment, industrial indicators, industrial instrumentation, etc.). In one example, the luminescent label 400 can correspond to the luminescent label 104 shown in FIG. 1. However, it is to be appreciated that the luminescent label 400 can be implemented separate from the system 100 (e.g., for indication purposes associated with industrial automation equipment, etc.). In the embodiment shown in FIG. 4, the fluorophore layer 202 is implemented as a plurality of fluorophore layers 202a-c. Furthermore, the mask layer 302 is implemented as a plurality of mask layers 302a-d. Rather than generating uniform output light 110 as in FIG. 2 and FIG. 3, the plurality of fluorophore layers 202a-c generate striped output light 110. The plurality of mask layer 302a-d are implemented around the plurality of fluorophore layers 202a-c so that the light 108 is not emitted through the substrate layer 204. In an implementation, each of the plurality of fluorophore layers 202a-c can generate output light 110 associated with the same color. In another implementation, the plurality of fluorophore layers 202a-c can generate output light 110 associated with two or more colors. For example, the fluorophore layer 202a can generate output light 110 associated with a first color (e.g., the fluorophore layer 202a can be associated with a first fluorophore composition), the fluorophore layer 202b can generate output light 110 associated with a second color (e.g., the fluorophore layer 202b can be associated with a second fluorophore composition), etc. Alternatively, the fluorophore layer 202 can be applied to the mask layer 302 (e.g., printed on top of the mask layer 302 to cover at least a portion of the mask layer 302). Accordingly, only an area of the fluorophore layer 202 exposed to the lens 106 will be projected. In certain implementations, the luminescent label 400 can alternatively be oriented so the light 108 passes through the luminescent label 400 (and the output light 110 is projected) in an opposite direction to what is shown in FIG. 4.
[0045]FIG. 5 illustrates an example luminescent label 500 (e.g., a side-view of an example luminescent label 104). The luminescent label 500 can be associated with an industrial application (e.g., an optical sensor, industrial equipment, industrial automation equipment, industrial indicators, industrial instrumentation, etc.). In one example, the luminescent label 500 can correspond to the luminescent label 104 shown in FIG. 1. However, it is to be appreciated that the luminescent label 500 can be implemented separate from the system 100 (e.g., for indication purposes associated with industrial automation equipment, etc.). In the embodiment shown in FIG. 5, the fluorophore layer 202 is implemented as a plurality of fluorophore layers 202a-c without the mask layer 302 (e.g., without the plurality of mask layers 302a-d). As in FIG. 4, the plurality of fluorophore layers 202a-c generate a striped output light 110. Furthermore, since the plurality of mask layer 302a-d are not implemented around the plurality of fluorophore layers 202a-c, light 108 generated by the light source is also emitted through the substrate layer 204 in addition to the striped output light 110 generated by the plurality of fluorophore layers 202a-c. The light 108 emitted through the substrate layer 204 can be striped light. Furthermore, the light 108 emitted through the substrate layer 204 (e.g., striped light) can be associated with a different color than the striped output light 110 generated by the plurality of fluorophore layers 202a-c. The luminescent label 400 and/or the luminescent label 500 (e.g., luminescent label 104) shown in FIG. 4 and FIG. 5 can be employed, for example, to generate a code (e.g., a color code). For example, ratios of wavelengths associated with the output light 110 generated by the luminescent label 400 and/or the luminescent label 500 (e.g., luminescent label 104) and/or the light 108 emitted through the substrate layer 204 can form a code. It is to be appreciated that the fluorophore layer 202 (e.g., the fluorophore layers 202a-c) can be associated with a uniform distribution of fluorophore patterns, varying fluorophore patterns, varying fluorophore shapes, varying emission wavelengths and/or varying temporal outputs. Alternatively, the fluorophore layer 202 can be applied to the mask layer 302 (e.g., printed on top of the mask layer 302 to cover at least a portion of the mask layer 302). Accordingly, only an area of the fluorophore layer 202 exposed to the lens 106 will be projected. In certain implementations, the luminescent label 500 can alternatively be oriented so the light 108 passes through the luminescent label 500 (and the output light 110 is projected) in an opposite direction to what is shown in FIG. 5.
[0046]FIG. 6A illustrates an example masked fluorophore layer of a luminescent label (a bottom-view of an exemplary masked fluorophore layer of a luminescent label). In the embodiment shown in FIG. 6A, a mask pattern corresponding to the mask layer 302 is applied to the fluorophore layer 202 (e.g., fluorophore layer 202 that is applied to the substrate layer 204). The mask pattern corresponding to the mask layer 302 can be employed to vary density (e.g., intensity) of the output light 110 generated by the fluorophore layer 202. Therefore, the mask layer 302 can additionally or alternatively be applied to the fluorophore layer 202 (e.g., in addition to or rather than being applied to the substrate layer 204). It is to be appreciated that the mask pattern of the mask layer 302 shown in FIG. 6A is merely an example. Therefore, a mask pattern of the mask layer 302 can be varied based on design criteria of a particular implementation.
[0047]FIG. 6B illustrates another example masked fluorophore layer of a luminescent label (a bottom-view of an exemplary masked fluorophore layer of a luminescent label). In the embodiment shown in FIG. 6B, a fluorophore pattern corresponding to the fluorophore layer 202 is generated (e.g., applied to the substrate layer 204). Furthermore, a mask layer 304 is applied (e.g.,