Blue light excitation of fluorescent ceramic lamp beads and near-infrared spectroscopy optical devices
By incorporating a light-shielding silicone part into the blue light-excited fluorescent ceramic lamp bead, the stray light problem in near-infrared spectral products is solved, achieving spectral stability and applicability, making it suitable for demanding applications.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGKE HAOYE (DONGGUAN) MATERIAL TECH CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-06-30
AI Technical Summary
Existing near-infrared spectral optical products suffer from stray light issues, which limits their application in demanding fields.
The design of the lamp bead using blue light to excite fluorescent ceramics ensures that blue light is emitted only from the front and is excited by the fluorescent ceramic plate to produce a light source without blue light by setting a first light-shielding silicone part around the blue light generator and a second light-shielding silicone part around the encapsulation formed by the substrate and the fluorescent ceramic plate.
It achieves spectral stability and avoids the generation of impurity light, making it suitable for fields with strict requirements on light waves, such as medicine, chemistry, forensics, security monitoring, and projection.
Smart Images
Figure CN224439562U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical product manufacturing technology, and more specifically, to a lamp bead that uses blue light to excite fluorescent ceramics and a near-infrared spectral optical device. Background Technology
[0002] The near-infrared spectral range is of great importance for many applications, such as analytical spectroscopy (medical, chemical or forensic), security monitoring (iris recognition, smoke detectors, closed-circuit television, etc.), and even projection (night vision equipment testing phase).
[0003] However, these fields have strict requirements for light waves; currently, some near-infrared spectral optical products have stray light, which limits their application in demanding fields. Utility Model Content
[0004] The purpose of this application is to provide a lamp bead that uses blue light to excite fluorescent ceramics and a near-infrared spectral optical device.
[0005] This application provides a lamp bead that uses blue light to excite fluorescent ceramics, comprising:
[0006] A substrate having an accommodating space on it;
[0007] Blue light generator; the blue light generator is fixed in the accommodating space of the substrate;
[0008] A first light-shielding silicone part is disposed circumferentially around the blue light generator to block the blue light emitted circumferentially by the blue light generator; and
[0009] A fluorescent ceramic plate; the fluorescent ceramic plate is encapsulated and covered by a first light-shielding silicone part, so that the blue light emitted by the blue light generator is excited by the fluorescent ceramic plate to produce a light source without blue light; a second light-shielding silicone part is provided circumferentially for the encapsulation body formed by the substrate and the fluorescent ceramic plate.
[0010] In the above technical solution, the first light-shielding silicone part is disposed around the circumference of the blue light generator, and the second light-shielding silicone part is disposed around the circumference of the package formed by the substrate and the fluorescent ceramic plate. This prevents the blue light generator from emitting blue light from the side, thereby ensuring that the blue light emitted by the blue light generator is emitted from the front and excited by the fluorescent ceramic plate to produce a blue-light-free light source. This type of LED bead produces a blue-light-free light source after being excited by the fluorescent ceramic plate, resulting in a light source free of impurities and with a stable spectrum. It can be well applied in fields with strict requirements for light waves, such as spectroscopy (medical, chemical, or forensic), security monitoring (iris recognition, smoke detectors, closed-circuit television, etc.), and even projection (night vision equipment testing stage) and LED lighting.
[0011] In other embodiments of this application, the light source emitted by the blue light generator described above is blue light with a wavelength of 450 nanometers to 452 nanometers.
[0012] In other embodiments of this application, the fluorescent ceramic plate described above is yttrium aluminum garnet transparent ceramic.
[0013] In other embodiments of this application, the substrate includes: an aluminum nitride substrate, a metal dam, and a ceramic limiting portion; the metal dam is disposed on the aluminum nitride substrate and is located circumferentially in the accommodating space; the ceramic limiting portion is disposed on the metal dam, a fluorescent ceramic plate is placed on the metal dam, and the ceramic limiting portion is located on the outer periphery of the fluorescent ceramic plate; the fluorescent ceramic plate is connected to the metal dam and the ceramic limiting portion through an adhesive silicone layer; the emitting surface of the blue light generator faces the fluorescent ceramic plate.
[0014] In other embodiments of this application, the substrate includes: a front circuit layer; an accommodating space is disposed on the front circuit layer, and a blue light generator is soldered into the accommodating space.
[0015] In other embodiments of this application, the substrate includes: positive and negative electrodes on the back side, and a blue light generator is connected to the positive and negative electrodes on the back side.
[0016] In other embodiments of this application, the thickness of the fluorescent ceramic plate is 0.3 mm to 3 mm;
[0017] The height of the metal dam is 0.25 mm to 0.4 mm.
[0018] In other embodiments of this application, the blue light generator is a blue light diode.
[0019] In other embodiments of this application, the aluminum nitride substrate is provided with through holes, through which the blue light generator is connected to the positive and negative electrodes on the back side.
[0020] In other embodiments of this application, the emission spectrum emitted by the LED is between 700 nm and 750 nm.
[0021] In a second aspect, this application provides a near-infrared spectral optical device, including a lamp bead that excites fluorescent ceramics with blue light as provided in any of the first aspects above; the near-infrared spectral optical device includes a plurality of lamp beads that excite fluorescent ceramics with blue light.
[0022] In other embodiments of this application, a second light-shielding silicone portion is provided between adjacent blue light-excited fluorescent ceramic beads. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 A schematic diagram of a lamp bead excited by blue light using a first-view perspective, provided as an embodiment of this application;
[0025] Figure 2 A schematic diagram of a lamp bead excited by blue light using a second perspective, provided in an embodiment of this application;
[0026] Figure 3 This is a schematic diagram of the substrate from a first-view perspective provided in an embodiment of this application;
[0027] Figure 4 This is a schematic diagram of the substrate from a second perspective, provided in an embodiment of this application.
[0028] Figure 5 This is a schematic diagram of the overall structure of the substrate provided in the embodiments of this application;
[0029] Figure 6 A schematic diagram of the structure of the near-infrared spectral optical device (full plate) provided in the embodiments of this application;
[0030] Figure 7 The spectrum of the near-infrared spectral optical device (single bead) provided in Embodiments 1 and 2 of this application.
[0031] Icons: 100 - LED bead excited by blue light to produce fluorescent ceramic light; 110 - Substrate; 111 - Accommodation space; 112 - Aluminum nitride substrate; 113 - Metal dam; 114 - Ceramic limiting part; 115 - Front circuit layer; 116 - Back positive and negative electrodes; 117 - Through hole; 120 - Blue light generator; 130 - First light-shielding silicone part; 140 - Fluorescent ceramic plate; 141 - Adhesive silicone layer; 200 - Near-infrared spectral optical device; 210 - Second light-shielding silicone part. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0033] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0035] In the description of the embodiments of this application, it should be understood that the terms "upper", "left", "right", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0036] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0037] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0038] Research has shown that fluorescent ceramic materials excited by a blue laser at approximately 450 nanometers can emit spectra between 700 and 750 nanometers. This includes thermal quenching behavior, which is crucial for transducers with very large Stokes shifts.
[0039] Further research revealed that yttrium aluminum garnet transparent ceramics can achieve optimal absorption of blue laser light at around 450 nanometers.
[0040] Further research revealed that in the traditional packaging process of yttrium aluminum garnet transparent ceramic LEDs, when the thickness of the fluorescent ceramic is too thick during the excitation of the yttrium aluminum garnet transparent ceramic, there will be a significant difference between the light emitted from the side and the light emitted from the front, resulting in a larger light spot of the LED; or stray light (blue light) will be generated.
[0041] Based on the above research, please refer to Figures 1-4 This application provides a lamp bead 100 that uses blue light to excite fluorescent ceramics, including: a substrate 110, a blue light generator 120, a first light-shielding silicone part 130, and a fluorescent ceramic plate 140.
[0042] Furthermore, in some embodiments of this application, a receiving space 111 is provided on the substrate 110. A blue light generator 120 is fixed to the receiving space 111 of the substrate 110. A first light-shielding silicone portion 130 is disposed circumferentially on the blue light generator 120 to block the blue light emitted circumferentially by the blue light generator 120. A fluorescent ceramic plate 140 is encapsulated and covered by the first light-shielding silicone portion 130, so that the blue light emitted by the blue light generator 120 is excited by the fluorescent ceramic plate 140 to produce a light source without blue light; a second light-shielding silicone portion is provided circumferentially on the encapsulation formed by the substrate and the fluorescent ceramic plate.
[0043] In the above technical solution, the first light-shielding silicone part 130 is disposed around the blue light generator 120 to prevent the blue light generator 120 from emitting blue light from the side. The second light-shielding silicone part 210 is disposed around the circumference of the package formed by the substrate 110 and the fluorescent ceramic plate 140, thereby ensuring that the blue light emitted by the blue light generator is emitted from the front and excited by the fluorescent ceramic plate 140 to produce a blue-light-free light source. This type of LED bead produces a blue-light-free light source after being excited by the fluorescent ceramic plate 140, and the light source is free of impurities; the spectrum is stable; and it can be well applied in fields with strict requirements for light waves, such as spectroscopy (medical, chemical or forensic), security monitoring (iris recognition, smoke detectors, closed-circuit television, etc.), and even projection (night vision equipment testing stage) and LED lighting.
[0044] Furthermore, in some embodiments of this application, the light source emitted by the blue light generator is blue light with a wavelength of 450 nanometers to 452 nanometers.
[0045] For example, in some embodiments of this application, the light source emitted by the blue light generator is blue light with wavelengths of 450 nanometers, 451 nanometers, 452 nanometers, or blue light in the range between any two of the aforementioned values.
[0046] Furthermore, in some embodiments of this application, the fluorescent ceramic plate is a yttrium aluminum garnet transparent ceramic.
[0047] The aforementioned yttrium aluminum garnet transparent ceramic can emit a near-infrared spectrum with an emission spectrum between 700 nm and 750 nm when excited by blue light.
[0048] For example, in some embodiments of this application, the fluorescent ceramic plate described above can be prepared using the preparation method disclosed in Chinese Patent 201310610479.6 to obtain yttrium aluminum garnet transparent ceramic.
[0049] Furthermore, in some embodiments of this application, reference is made to... Figure 3 and Figure 4 The substrate 110 includes an aluminum nitride substrate 112, a metal dam 113, and a ceramic limiting portion 114. The metal dam 113 is disposed on the aluminum nitride substrate 112 and is located circumferentially in the accommodating space 111. The ceramic limiting portion 114 is disposed on the metal dam 113, and a fluorescent ceramic plate 140 is placed on the metal dam 113, with the ceramic limiting portion 114 located on the outer periphery of the fluorescent ceramic plate 140. The fluorescent ceramic plate 140 is connected to the metal dam 113 and the ceramic limiting portion 114 via an adhesive silicone layer 141. The emitting surface of the blue light generator 120 faces the fluorescent ceramic plate 140.
[0050] For example, refer to Figure 1 The fluorescent ceramic plate 140 is positioned at the stepped locking structure formed by the metal dam 113 and the ceramic limiting part 114, which enables precise positioning and stable installation of the fluorescent ceramic plate 140.
[0051] Furthermore, the above technical solution achieves a stable encapsulation by bonding the fluorescent ceramic plate 140 to the metal dam 113 and the ceramic limiting part 114. Alternatively, in some embodiments of this application, the fluorescent ceramic plate 140 is connected to the metal dam 113 and the ceramic limiting part 114 via an adhesive silicone layer 141. This can be achieved by using a two-component transparent silicone potting solution followed by curing and encapsulation to form the adhesive silicone layer 141, thus achieving a sealed connection.
[0052] The aforementioned metal dam 113 serves to limit the height, which is beneficial for obtaining a flat appearance after the blue light generator 120 is packaged.
[0053] Further optionally, in some embodiments of this application, the substrate 110 includes: a front circuit layer 115; an accommodating space 111 disposed on the front circuit layer 115, and a blue light generator 120 soldered into the accommodating space 111.
[0054] Alternatively, in some embodiments of this application, the blue light generator 120 described above is eutectic bonded to the accommodating space 111 of the substrate 110 using die-bonding flux.
[0055] The aluminum nitride substrate 112 described above can be a common aluminum nitride substrate 112 with dedicated circuitry in the art, which typically has a cup-shaped body and can serve as the accommodating space 111 of the substrate 110 of this application.
[0056] Furthermore, in some embodiments of this application, the substrate includes: a back positive and negative electrode 116, the back positive and negative electrode 116 being disposed on the back side of the substrate 110, and a blue light generator 120 being located on the front side of the substrate 110; the blue light generator 120 is connected to the back positive and negative electrode 116.
[0057] Furthermore, in some embodiments of this application, the thickness of the fluorescent ceramic plate is 0.3 mm to 3 mm; exemplary, the thickness of the fluorescent ceramic plate is 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm or any two of the aforementioned values.
[0058] Furthermore, in some embodiments of this application, the height of the metal dam is 0.25 mm to 0.4 mm. Exemplarily, the height of the metal dam is 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, 0.30 mm, 0.31 mm, 0.32 mm, 0.33 mm, 0.34 mm, 0.35 mm, 0.36 mm, 0.37 mm, 0.38 mm, 0.39 mm, 0.40 mm, or a range between any two of the aforementioned values.
[0059] Furthermore, in some embodiments of this application, the blue light generator 120 is a blue light diode.
[0060] The aforementioned blue light diode can be selected from commonly used diodes in the field that can emit blue light with a light source of 450 nm to 452 nm.
[0061] Furthermore, in some embodiments of this application, the aluminum nitride substrate 112 is provided with a through hole 117, through which the blue light generator 120 is connected to the positive and negative electrodes 116 on the back side.
[0062] Furthermore, in some embodiments of this application, the emission spectrum emitted by the lamp bead is between 700 nanometers and 750 nanometers.
[0063] For example, in some embodiments of this application, the emission spectrum emitted by the lamp bead is 700 nm, 705 nm, 710 nm, 715 nm, 720 nm, 725 nm, 730 nm, 735 nm, 740 nm, 745 nm, 750 nm or any two of the aforementioned values.
[0064] Some embodiments of this application provide a near-infrared spectroscopy optical device 200, including a lamp bead 100 of fluorescent ceramic excited by blue light as provided in any of the preceding embodiments; the near-infrared spectroscopy optical device 200 includes a plurality of lamp beads 100 of fluorescent ceramic excited by blue light.
[0065] Furthermore, in some embodiments of this application, a second light-shielding silicone part 210 is provided between adjacent blue light-excited fluorescent ceramic lamp beads of the aforementioned near-infrared spectral optical device 200.
[0066] By providing the second light-shielding silicone part 210, it is further beneficial to obtain a flat surface; to avoid blue stray light emitted from the surrounding area; and to obtain a near-infrared spectral optical device with high spectral consistency and a neat appearance.
[0067] Furthermore, in some embodiments of this application, the above-described near-infrared spectral optical device can be fabricated according to the following method:
[0068] Step S1: Prepare substrate 110.
[0069] (1) Design of aluminum nitride substrate 112 with specific dimensions:
[0070] For example, in some embodiments of this application, the aluminum nitride substrate 112 is designed with dimensions of (3.4 mm to 3.6 mm) * (3.4 mm to 3.6 mm), the overall panel size is (53 mm to 55 mm) * (108 mm to 110 mm), and the total number of LED chips on the circuit board is 364. (Refer to...) Figure 5 .
[0071] (2) Functional regions are formed on aluminum nitride substrate 112 to form substrate 110.
[0072] Exemplary, in some embodiments of this application, reference is made to Figure 3 and Figure 4 The substrate 110 is provided with an aluminum nitride substrate 112, a front circuit layer 115, a back positive and negative electrode 116, a metal dam 113 (exemplarily, the height of the metal dam 113 can be selected as 0.25 mm-0.4 mm), and a ceramic limiting part 114. The front circuit layer 115 and the back positive and negative electrode 116 are connected through a through hole 117, and the front circuit layer 115 and the back positive and negative electrode 116 are solderable. Figure 3 The front functional area of substrate 110 is shown; Figure 4 The back surface of substrate 110 is shown as the power electrode region. Figure 5 A complete circuit board diagram is shown.
[0073] Step S2: Encapsulate the light source.
[0074] (1) Material preparation:
[0075] For example, in some embodiments of this application, the entire circuit board substrate of the aforementioned step S1 is used; 447 nm-455 nm blue light diodes, die bonding agent, light-shielding silicone, transparent two-component adhesive silicone, fluorescent ceramic plate (yttrium aluminum garnet transparent ceramic), and production equipment are prepared.
[0076] (2) Welding:
[0077] For example, in some embodiments of this application, 447nm-455nm blue LEDs are bonded to the aforementioned circuit board substrate using a die bonding device and a soldering flux.
[0078] Further optionally, in some embodiments of this application, the above-described die bonding process can be a flip-chip eutectic bonding process; further optionally, the flip-chip voltage range is 2.6V-3.2V. Exemplarily, the flip-chip voltage is 2.6V, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, or any two of the aforementioned values.
[0079] Further optionally, in some embodiments of this application, the die bonding process described above can be a positive bonding process; further optionally, the voltage range of the positive bonding process is 2.6V-12.8V. Exemplarily, the voltage of the positive bonding process is 2.6V, 2.7V, 2.8V, 2.9V, 3.0V, 3.1V, 3.2V, 3.3V, 3.5V, 4.0V, 4.5V, 5.0V, 5.5V, 6.0V, 6.5V, 7.0V, 8.0V, 9.0V, 10.0V, 11.0V, 12.0V, 12.8V, or a range between any two of the aforementioned values.
[0080] (3) The blue light chip is surrounded by:
[0081] Cover the blue LED that was soldered in step (2) with light-shielding silicone to retain the blue light on the front. Then bake it in an oven at 80℃-100℃ for 1 hour, then bake it at 150℃ for 2 hours until the light-shielding silicone is cured, forming the first light-shielding silicone part.
[0082] (4) Encapsulation of fluorescent ceramic plates:
[0083] For example, in some embodiments of this application, a fluorescent ceramic plate (yttrium aluminum garnet transparent ceramic) is bonded to the sealed material obtained in step (3) using a two-component transparent silicone using a special device, and then baked in an oven at 80°C-100°C for 1 hour, then at 150°C for 2 hours until the two-component transparent silicone is cured.
[0084] (5) Light-shielding silicone potting:
[0085] The edge of the whole plate product obtained in the aforementioned step (4) is surrounded by a device and placed in an oven to bake at 150°C for 2 hours. After curing, light-shielding silicone is poured into the gap of the LED product and made flush with the surface of the fluorescent ceramic plate. It is then placed in an oven at 80°C-100°C for 1 hour and then baked at 150°C for 2 hours to form the second light-shielding silicone part 210. Figure 6 It is a full-page physical object, namely an infrared spectral optical device.
[0086] (6) Cutting:
[0087] After the product has been potted and baked in step (5), a high-precision cutting device is used to precisely cut between the LED beads, allowing some of the light-shielding silicone to adhere tightly to the perimeter of the fluorescent ceramic plate. For example... Figure 1 and Figure 2 The diagram shows a single LED bead (an LED bead that excites fluorescent ceramic with blue light), with a second light-shielding silicone part 210 formed circumferentially. The near-infrared spectral optical device prepared by the above process has a uniform thickness of light-shielding silicone attached to the surface of the fluorescent ceramic plate, resulting in a smooth surface with good light-shielding effect; and by setting the second light-shielding silicone part 210, blue light is prevented from circumferentially emitted, avoiding the generation of stray light and resulting in good spectral consistency.
[0088] Furthermore, the aforementioned near-infrared spectral optical device can be applied in fields with strict requirements for light waves. For example, the aforementioned near-infrared spectral optical device can be applied to fields such as spectroscopy (medical, chemical or forensic), security monitoring (iris recognition, smoke detectors, closed-circuit television, etc.), and even projection (night vision equipment testing stage) and LED lighting.
[0089] The technical effects of the solution in this application are illustrated below with reference to specific embodiments:
[0090] Example 1
[0091] This embodiment provides a near-infrared spectroscopy optical device, which is fabricated using the aforementioned substrate 110 according to the following steps:
[0092] (a) Die bonding: Using flip-chip eutectic bonding process, the 450 nm blue light diode is eutectic bonded to the cup of the aforementioned substrate 110 with die bonding flux, so that the PN electrode of the blue light diode is conductively bonded to the positive and negative electrodes of the substrate 110.
[0093] (b) Encasing the diode: The blue diode is encased in the cup of substrate 110 with milky white light-shielding silicone through a dispensing device, leaving the front of the blue diode exposed. After completion, it is baked in an oven at 100°C for 1 hour, then at 150°C for 2 hours; thus, the first light-shielding silicone part is encased in the circumference of the blue diode.
[0094] (c) Fluorescent ceramic plate: The fluorescent ceramic plate (yttrium aluminum garnet transparent ceramic) is bonded and fixed at the step position formed by the metal dam 113 and the ceramic limiting part 114 directly above the blue light diode using two-component transparent silicone. After completion, it is placed in an oven at 100°C for 1 hour and then at 150°C for 2 hours.
[0095] (d) Side potting and wrapping of fluorescent ceramic plates: After baking, a dam is built around the entire plate material to enclose all the fluorescent ceramic plates in the middle. Milky white light-shielding silicone is potted between the fluorescent ceramic plates, with the height of the glue level with the top of the inorganic fluorescent block. After completion, it is placed in an oven at 100°C for 1 hour and then at 150°C for 2 hours (forming the second light-shielding silicone part 210). The resulting near-infrared spectral optical device has a neat appearance.
[0096] Comparative Example 1
[0097] A near-infrared spectroscopy optical device is provided, which differs from Embodiment 1 in that:
[0098] Step (d) in Example 1 is not included.
[0099] Experimental Example
[0100] The products of Example 1 and Comparative Example 1, after being potted and baked, were precisely cut into individual LED beads using a precision semiconductor cutting device; for example... Figure 1 .
[0101] The individual LED chips of Example 1 and Comparative Example 1 were tested and taped using a testing tape machine. The test results are shown in [Figure Number]. Figure 7 .
[0102] from Figure 7 It can be seen that the spectrum emitted by the LED chip in Comparative Example 1 has a characteristic peak at 450nm, and there are obvious blue light stray peaks. Therefore, the spectral consistency of Comparative Example 1 is poor. It cannot be applied to fields with strict requirements on light waves, such as spectroscopy (medical, chemical, or forensic), security monitoring (iris recognition, smoke detectors, closed-circuit television, etc.), or even projection (night vision equipment testing phase) and LED lighting.
[0103] The LED chip of Embodiment 1 of this application emits a spectrum with a characteristic peak only at 710nm, indicating that the LED chip of Embodiment 1 has no other blue light stray peaks. Therefore, the spectrum of Embodiment 1 has excellent consistency. It can be well applied in fields with strict requirements for light waves, such as spectroscopy (medical, chemical, or forensic), security monitoring (iris recognition, smoke detectors, closed-circuit television, etc.), and even projection (night vision equipment testing phase) and LED lighting.
[0104] Furthermore, this product, which uses a 450-nanometer laser to excite inorganic fluorescent materials to emit a 710-nanometer near-infrared spectrum, can be applied in the field of eye protection; it can also enable product miniaturization, for example, it can be made into wearable, blue-light-free products.
[0105] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A lamp bead for exciting a fluorescent ceramic with blue light, characterized in that include: A substrate having an accommodating space provided thereon; Blue light generator; the blue light generator is fixed in the accommodating space of the substrate; A first light-shielding silicone part, disposed circumferentially around the blue light generator, is used to block the blue light emitted circumferentially by the blue light generator; and A fluorescent ceramic plate; the fluorescent ceramic plate is encapsulated and covered by the first light-shielding silicone part, so that the blue light emitted by the blue light generator is excited into a light source without blue light by passing through the fluorescent ceramic plate; A second light-shielding silicone portion is provided circumferentially for the encapsulation formed by the substrate and the fluorescent ceramic plate.
2. The lamp bead for exciting fluorescent ceramics with blue light according to claim 1, characterized in that, The blue light generator emits blue light with a wavelength of 450-452 nanometers.
3. The lamp bead for exciting fluorescent ceramics with blue light according to claim 1, characterized in that, The fluorescent ceramic plate is a transparent yttrium aluminum garnet ceramic.
4. The lamp bead for exciting fluorescent ceramics with blue light according to any one of claims 1-3, characterized in that, The substrate includes: an aluminum nitride substrate, a metal dam, and a ceramic limiting portion; the metal dam is disposed on the aluminum nitride substrate and is located circumferentially in the accommodating space; the ceramic limiting portion is disposed on the metal dam, and the fluorescent ceramic plate is placed on the metal dam, with the ceramic limiting portion located on the outer periphery of the fluorescent ceramic plate; the fluorescent ceramic plate is connected to the metal dam and the ceramic limiting portion through an adhesive silicone layer; the emitting surface of the blue light generator faces the fluorescent ceramic plate.
5. The lamp bead for exciting fluorescent ceramics with blue light according to claim 4, characterized in that, The substrate includes: a front circuit layer; the accommodating space is disposed on the front circuit layer, and the blue light generator is soldered into the accommodating space.
6. The lamp bead for exciting fluorescent ceramics with blue light according to claim 5, characterized in that, The substrate includes: positive and negative electrodes on the back side; the blue light generator is connected to the positive and negative electrodes on the back side.
7. The lamp bead for exciting fluorescent ceramics with blue light according to claim 4, characterized in that, The thickness of the fluorescent ceramic plate is 0.3 mm to 3 mm; The height of the metal dam is 0.25 mm to 0.4 mm.
8. The lamp bead for exciting fluorescent ceramics with blue light according to claim 1, characterized in that, The emission spectrum emitted by the LED beads is between 700 nanometers and 750 nanometers.
9. A near-infrared spectroscopy optical device, characterized in that, The device includes the LED beads for exciting fluorescent ceramics with blue light as described in any one of claims 1-8; the near-infrared spectral optical device includes a plurality of LED beads for exciting fluorescent ceramics with blue light.
10. The near-infrared spectral optical device according to claim 9, characterized in that, A second light-shielding silicone part is provided between adjacent blue light-excited fluorescent ceramic lamp beads.