CN215815929U

CN215815929U - Reflective fluorescent wavelength converter

Info

Publication number: CN215815929U
Application number: CN202120462798.7U
Authority: CN
Inventors: 杨柳; 文波; 盛芳
Original assignee: Nanjing Xizi New Material Technology Co ltd
Current assignee: Hangzhou Xichen Technology Co ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2022-02-11
Anticipated expiration: 2031-03-03

Abstract

The utility model relates to a reflective fluorescent wavelength converter, which realizes the conversion of incident light with one wavelength into light output with different wavelengths in a reflective mode and is used in the technical fields of LED or laser diode illumination, display and the like. The utility model provides a reflective fluorescence wavelength conversion device, which comprises a fluorescent material film (101), a transparent substrate (102) and a reflecting film (103) which are sequentially arranged. The incident light enters the fluorescent material film (101), is absorbed by the fluorescent material film and converted into light of another wavelength, and is output from the same side of the fluorescent material film (101). The utility model has the advantages of high efficiency, stable optical performance and structure, small volume and the like in the application range including the conversion of LED light sources, laser diode light sources and the like.

Description

Reflective fluorescent wavelength converter

Technical Field

The utility model relates to a fluorescence wavelength conversion device, which realizes the conversion of incident light with one wavelength into output light with different wavelengths in a reflection mode and is used in the technical fields of LED or laser diode illumination, display and the like.

Background

The wavelength converter based on the fluorescent material absorbs incident light using the fluorescent material and then emits light of a different wavelength, thereby implementing wavelength conversion of the light. Wavelength conversion devices of this type have found wide application in many fields. For example, in an LED light source, such a type of wavelength converter is used to convert blue or ultraviolet light emitted from an LED chip into green, yellow and red light and white light. In laser diode based light sources, this type of wavelength converter can also convert blue or other wavelengths of light emitted by the laser diode into green, yellow and red light and white light. It is clear that the conversion efficiency and other properties of the wavelength converter directly affect the technical and economic indicators of efficiency, reliability and cost of these light sources.

Wavelength converters are complex processes to achieve wavelength conversion of light. First, incident light may be reflected and scattered as it enters the wavelength converter. During the conversion process, part of the energy is changed into heat energy due to the increase of the wavelength of light before and after the conversion, thereby causing the wavelength converter to generate heat. These will directly result in a reduction of the efficiency of the wavelength converter. If the heat generated in the conversion process cannot be dissipated timely, the chemical stability of the material can be influenced, the mechanical property can be reduced, and the structural stability can be influenced.

Therefore, an ideal wavelength converter would have the following characteristics: (1) less scattering of incident light; (2) good thermal conductivity and excellent thermal stability; (3) excellent heat resistance; (4) excellent structural stability. In the existing wavelength converter design, the light converter based on the fluorescent material is generally made by mixing resin or glass with poor heat conductivity and poor heat resistance with ceramic fluorescent powder, and the requirements can not be met.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fluorescence wavelength conversion device working in a reflection mode aiming at the problems in the prior art.

The utility model is realized by the following technical scheme:

as shown in fig. 1, the wavelength converter of the present invention includes a fluorescent ceramic conversion film 101, a heat-conductive and heat-resistant transparent substrate 102, and a reflective film 103, which are sequentially disposed, and are integrated together. The incident light enters the fluorescent ceramic conversion film 101, is absorbed by it and converted into light of another wavelength, and is output from the fluorescent ceramic conversion film 101. Wherein the partially converted light enters the transparent substrate 102, passes through the reflective film 102, enters the fluorescent ceramic conversion film 101 again, and is then output from the fluorescent ceramic conversion film 101.

The reflective film is a single-layer or multilayer ceramic dielectric film or metal film to ensure that more than 95% of light irradiated on the reflective film is reflected back to the fluorescent ceramic film 101. The reflecting film is manufactured by adopting methods such as electron beam evaporation coating, magnetron sputtering, chemical vapor deposition and the like.

The transparent substrate has a transmittance of more than 85% for incident light and light converted by the fluorescent material, and the surface of the transparent substrate needs to be polished at an optical level. The transparent base material is required to have good thermal conductivity and heat dissipation, excellent mechanical strength, excellent corrosion resistance, and the like. The transparent substrate also needs to have a coefficient of thermal expansion close to that of the fluorescent material and the reflective film. The transparent substrate material may be, but is not limited to, sapphire (Al)₂O₃) Yttrium aluminum garnet (Y)₃Al₅O₁₂) Single crystal or transparent polycrystalline ceramics, Y₂O₃Single crystal or transparent polycrystalline ceramics, AlON transparent ceramics, MgAl₂O₄Transparent ceramics, and the like. The thickness of the transparent substrate is between 0.05mm and 10.00 mm.

The fluorescent ceramic conversion film is made of a full-ceramic material and does not contain any organic matter or glass phase, so that the excellent heat conduction and heat dissipation performance and high-temperature stability of the fluorescent ceramic conversion film are guaranteed. The thickness of the fluorescent ceramic conversion film is between 0.02mm and 0.40 mm.

The phosphor film may be a yellow phosphor, as desired, which is effective in absorbing incident light and efficiently converting to yellow, including but not limited to aluminate yellow phosphors such as YAG: ce series, silicate series, e.g. Sr₃SiO₅: eu, and the like.

The phosphor film may be a green phosphor, as desired, which can efficiently absorb incident light and efficiently convert to green light, including but not limited to aluminate green phosphors such as LuAG: ce, GaAG: ce, SrSiO₄：Eu，CaMgSi₂O₆: eu, and the like.

The phosphor film may be a red phosphor, as desired, that effectively absorbs incident light and efficiently converts to red light, including but not limited to silicate series such as Sr₂Si₇Al₃ON₁₃：Eu。

The fluorescent ceramic conversion film is combined with the transparent substrate in a way that no organic matter or glass material is used, and a direct high-temperature packaging (sintering) technology of the ceramic and the transparent substrate is adopted, so that the fluorescent ceramic film is in tight gapless contact with the transparent substrate, and excellent heat conduction and heat dissipation performance and high-temperature stability of the fluorescent ceramic film are guaranteed.

The utility model has the following beneficial effects:

(1) good thermal conductivity and heat dissipation: the whole device does not comprise any organic material component with poor heat conduction and heat dissipation performance, the thickness of each component except the transparent substrate is not more than 1mm, and the transparent substrate also has good heat conduction and heat dissipation performance; (2) excellent structural stability: all parts of the device are made of inorganic materials, and have excellent mechanical property and heat resistance, so that the stability of the structure is ensured; (3) excellent conversion efficiency: the device is provided with the reflecting film, the efficient fluorescent conversion film and the good heat conduction and heat dissipation conditions of the whole device are matched, so that the excellent conversion efficiency of the device is ensured; (4) performance stability: the stability of the optical performance of the whole device is ensured by the good heat conduction and heat dissipation performance and the structural stability of the device; (5) miniaturization of volume: the whole device is integrated, and the size of the device is reduced to the maximum extent.

Drawings

Fig. 1 is a schematic structural cross-sectional view of an optical wavelength conversion device according to the present invention. Wherein 101 is a fluorescent ceramic conversion film reflective film, 102 is a transparent substrate, and 103 is a reflective film.

Fig. 2 is a schematic diagram illustrating the working principle of the optical wavelength conversion device after incident light passes through the optical wavelength conversion device. In this case, 201 denotes a fluorescent ceramic conversion film, 202 denotes a sapphire substrate, and 203 denotes a reflective film. 204 is the spectrum of the incident light, and 205 is the spectrum of the output light.

Detailed Description

The following is a specific embodiment of the present invention and is further described with reference to fig. 2. However, the present invention is not limited to these examples.

The wavelength conversion device provided by the utility model comprises a fluorescent ceramic conversion film 101, a heat-conducting and heat-resisting transparent substrate 102 and a reflecting film 103 which are sequentially arranged, and the components are integrated. The incident light enters the fluorescent ceramic conversion film 101, is absorbed by it and converted into light of another wavelength, and is output from the fluorescent ceramic conversion film 101.

The wavelength converter was constructed as follows:

(1) first, a sapphire sheet having a thickness of 0.30mm and a diameter of 50mm, both sides of which were polished, was selected as a transparent substrate to serve as a substrate for the reflection film and the fluorescence conversion film.

(2) Uniformly coating a layer of Y with the thickness of 0.10-0.15 mm on one surface of a sapphire sheet₂O₃、Al₂O₃And CeO₂And (3) drying the ceramic slurry consisting of the powder, and then preserving heat for 4 hours at 1700 ℃, and simultaneously realizing that the ceramic powder mixture is YAG with a yellow fluorescent material structure: the conversion of Ce and the close contact with the sapphire surface without a gap.

(3) And a multilayer dielectric reflecting film is evaporated on the other surface of the sapphire so as to ensure that the reflectivity of light with the wavelength within the range of 400nm-750nm reaches more than 95%.

(4) The film sheet formed in accordance with the above procedure was cut into square sheets having a diameter of 5mm on a side.

Fig. 2 shows that a blue laser diode (emitting wavelength 450nm) is used as incident light 204, and after passing through the wavelength converter of the present invention, yellow light with wider wavelength (peak wavelength 550nm) and part of unconverted blue light 205 are output on the same side, so as to realize the required wavelength conversion function.

It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are given by way of example only and are not limiting of the utility model. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A reflective fluorescent wavelength converter is characterized by comprising a fluorescent material film (101), a heat-conducting and heat-resistant transparent substrate (102) and a reflecting film (103) which are sequentially arranged, wherein incident light enters the fluorescent material film (101), is absorbed by the fluorescent material film and is converted into light with another wavelength, and then is output from the same side of the fluorescent material film (101).

2. The reflective fluorescent wavelength converter of claim 1, wherein the reflective film is a multilayer oxide dielectric film or a single metal film, so as to ensure a reflectance of light with a wavelength of 400nm to 700nm of more than 95%, and is fabricated by electron beam evaporation, magnetron sputtering, or chemical vapor deposition.

3. The reflective fluorescent wavelength converter of claim 1, wherein the transparent substrate has a transmittance of 85% or more for incident light and light converted from the fluorescent material, a thermal expansion coefficient similar to that of the fluorescent material and the reflective film, and a thickness of 0.05mm to 10.00mm, and is made of sapphire, yttria alumina garnet single crystal or transparent polycrystalline ceramic, Y₂O₃Single crystal or transparent polycrystalline ceramics, AlON transparent ceramics, MgAl₂O₄One kind of transparent ceramic.

4. A reflective fluorescent wavelength converter according to claim 1, wherein the fluorescent material film is made of a fully ceramic material and does not contain any organic or glass phase.

5. A reflective fluorescent wavelength converter according to claim 1, wherein the film of fluorescent material is between 0.02mm and 0.40mm thick.

6. A reflective fluorescent wavelength converter according to claim 1, wherein the fluorescent material film is bonded to the transparent substrate without using any organic or glass material, and the fluorescent material film is tightly contacted to the transparent substrate without gap by high temperature sintering technique.