WO2016173525A1

WO2016173525A1 - Wavelength conversion device, light-emitting device and projecting device

Info

Publication number: WO2016173525A1
Application number: PCT/CN2016/080640
Authority: WO
Inventors: 李乾; 许颜正
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2015-04-29
Filing date: 2016-04-29
Publication date: 2016-11-03
Also published as: CN106195925A

Abstract

A wavelength conversion device, comprising a light-emitting layer (110) and a reflecting layer (120) which are arranged in a stacking way, the light-emitting layer (110) comprising a first photoluminescent material and a first binding agent, and the reflecting layer (120) comprising a second photoluminescent material, a second binding agent and reflective particles; light emitted from the reflecting layer (120) emerges completely through the light-emitting layer (110); and the light-emitting layer (110) and the reflecting layer (120) are directly connected to each other or are connected to each other by means of a sintered layer. Also provided are a light-emitting device and a projecting device.

Description

Wavelength conversion device, light emitting device and projection device

Technical field

The present invention relates to the field of laser display technology and illumination, and in particular to a wavelength conversion device, a light-emitting device and a projection device.

Background technique

With the development of display and lighting technology, the original halogen bulb as a light source is increasingly unable to meet the high power and high brightness requirements of display and illumination. Use solid state light sources such as LD ( Laser Diode The laser emits excitation light to excite the wavelength conversion material to obtain visible light of various colors, and this technology is increasingly used in illumination and display. This technology has the advantages of high efficiency, low energy consumption, low cost and long life, and is an ideal alternative to existing white or monochromatic light sources.

technical problem

In the prior art, a laser light source is used to illuminate a wavelength conversion device to obtain a desired light, and a wavelength conversion device having a three-layer structure of a light-emitting layer, a reflective layer, and a heat-conducting substrate is generally used, wherein the light-emitting layer receives the laser light source and emits a laser beam, and the reflective layer The laser light emitted from the light-emitting layer and the unexcited excitation light are reflected and emitted. Generally, metal is mainly used as a heat-conducting substrate, and a reflective film layer is generally made of high-purity aluminum or high-purity silver as a plating layer, and a transparent organic substance such as silica gel or resin is used as a packaging medium, and phosphor particles and silica gel are used. / The resins are mixed together and then coated on a metal substrate to form a light-emitting layer. This metal substrate + silicone / The resin structure wavelength conversion device can be applied to low-power laser light source applications, but as the application requirements increase, in the medium-high power laser light source environment, the wavelength conversion device of this structure encounters a bottleneck in use - because high The power laser will generate high temperature during long-time illumination, which will harden and crack the silica gel, even carbonization and blackening, and the metal plating reflective layer is easy to oxidize at high temperature, making this type of wavelength conversion device unable to adapt to the medium and high power laser light source.

In order to adapt to the working environment of high power laser, we use glass powder instead of silica gel / The resin serves as a packaging medium for the phosphor particles while replacing the metal plating reflective layer with an inorganic reflective layer composed of inorganic non-metallic particles. This thermally conductive substrate + inorganic reflective layer + The wavelength conversion device of the glass light-emitting layer structure overcomes the defects of the original metal substrate-silica gel/resin wavelength conversion device.

However, since the heat generated by the glass light-emitting layer needs to pass through the glass light-emitting layer and the inorganic reflective layer to reach the heat-conducting substrate, the heat transfer path is long and the heat resistance is large, causing heat accumulation of the light-emitting layer, resulting in a phosphor, especially a large amount of heat. The phosphor works for a long time at high temperatures and the conversion efficiency is lowered. To this end, a new wavelength conversion device needs to be developed to improve its heat dissipation performance under high power excitation light working environment.

Technical solution

In view of the above-described prior art wavelength conversion device having a long heat dissipation path and a large amount of heat generation, the present invention provides a wavelength conversion device having a shorter heat dissipation path and less heat generation.

The present invention provides a wavelength conversion device comprising: a light-emitting layer and a reflective layer disposed in a stacked manner, the light-emitting layer comprising a first photoluminescent material and a first adhesive, the reflective layer comprising a second photoluminescent material, a second adhesive The splicing agent and the reflective particles, the light emitted from the reflective layer is completely emitted through the luminescent layer, and the luminescent layer is directly connected to the reflective layer or connected through the sintered layer.

Preferably, the light emitted by the first photoluminescent material excites the second photoluminescent material and causes the second photoluminescent material to emit light of a longer wavelength.

Preferably, the first photoluminescent material is a phosphor that can be excited to emit yellow light, and the second photoluminescent material is a phosphor that can be excited to emit red light.

Preferably, the reflective particles comprise titanium oxide and aluminum oxide.

Preferably, in the reflective layer, the mass fraction of alumina is 0.5% to 30%, and the mass fraction of titanium oxide is 2% to 75%. .

Preferably, the second photoluminescent material occupies a mass fraction of the reflective layer of 1% to 75%.

Preferably, the second photoluminescent material occupies a mass fraction of the reflective layer of 10% to 45%.

Preferably, the second adhesive occupies a mass fraction of the reflective layer of 20 to 50%.

Preferably, the second binder is a glass powder of the SiO ₂ -B ₂ O ₃ -RO system, wherein R is one or more of Mg, Ca, Sr, Ba, Na, K.

Preferably, the reflective layer has a thickness of 20 to 100 μm.

Preferably, the reflective layer comprises ethyl cellulose, terpineol, butyl carbitol or silicone oil, and the mass fraction of the reflective layer is 0.001%~0.1%.

Preferably, the first adhesive is one or more of SiO ₂ -B ₂ O ₃ -RO , SiO ₂ -TiO ₂ -Nb ₂ O ₅ -R' ₂ O , ZnO-P ₂ O ₅ , wherein R is selected from one or more of Mg, Ca, Sr, Ba, Na, K, and R' is selected from one or more of Li, Na, and K.

Preferably, the ceramic substrate is further disposed on a side of the reflective layer away from the light emitting layer and disposed on the reflective layer, and the ceramic substrate is directly connected to the reflective layer or connected through the sintered layer.

Preferably, the ceramic substrate is an aluminum nitride substrate.

Preferably, the wavelength conversion device is a circular or circular color wheel, the light emitting layer is distributed in a circular or fan-shaped shape, and the reflective layer is distributed in a circular or fan-shaped shape.

The invention also provides a light-emitting device, comprising the above-mentioned wavelength conversion device, further comprising an excitation light source, the excitation light source is located on a side of the light-emitting layer away from the reflective layer, and the excitation light source emits excitation light incident on the light-emitting layer.

The present invention also provides a projection apparatus comprising the above illumination apparatus.

Beneficial effect

Compared with the prior art, the present invention includes the following beneficial effects:

By using a reflective layer comprising a second photoluminescent material, a second adhesive and reflective particles, the heat generated by the second photoluminescent material only needs to pass through the partially reflective layer to reach the thermally conductive substrate, thereby shortening the heat propagation distance. At the same time, the reflective ability of the reflective layer is preserved; at the same time, the second photoluminescent material in the reflective layer absorbs the intensity of the excitation light or the wavelength of the light from the luminescent layer, and the generated heat is greatly reduced, thereby avoiding the extra generation. The heat allows the wavelength conversion device to operate at a lower temperature, resulting in better luminous efficiency.

DRAWINGS

1 is a schematic structural diagram of a wavelength conversion device according to Embodiment 1 of the present invention;

2 is a heat transfer diagram of a wavelength conversion device according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of a wavelength conversion device according to Embodiment 2 of the present invention;

4 is a schematic structural view of a color wheel according to a third embodiment of the present invention, wherein 4a is a cross-sectional view of the color wheel, and 4b is a top view of the color wheel.

BEST MODE FOR CARRYING OUT THE INVENTION

The embodiments of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

Embodiment 1

1 is a schematic structural diagram of a wavelength conversion device according to Embodiment 1 of the present invention. The wavelength conversion device includes a light emitting layer 110. , a reflective layer 120 and a thermally conductive substrate 130.

The light emitting layer 110 includes a first photoluminescent material and a first adhesive. The black solid sphere in the luminescent layer 110 in the figure represents the phosphor particles of the first photoluminescent material, and may be any one of a yellow phosphor, a green phosphor, an orange phosphor, and a red phosphor. The first photoluminescent material is encapsulated into a layer by a first adhesive and is uniformly distributed or substantially uniformly distributed in the continuum formed by the first adhesive. The first adhesive in the present invention is an inorganic adhesive. Specifically, the inorganic adhesive is a first glass frit. In a preferred embodiment of the present invention, the first glass frit is one of SiO ₂ -B ₂ O ₃ -RO , SiO ₂ -TiO ₂ -Nb ₂ O ₅ -R' ₂ O , ZnO-P ₂ O ₅ Or one or more, wherein R is selected from one or more of Mg, Ca, Sr, Ba, Na, K, and R' is selected from one or more of Li, Na, K. The glass powder has the characteristics of high visible light transmittance, high temperature resistance and structural stability, and is suitable for light propagation and long-term operation at high temperatures.

In this embodiment, the light emitting layer 110 By uniformly mixing the phosphor particles of the first photoluminescent material with the first glass powder and sintering, in the preparation process, the first glass powder is heated near its softening point to be connected into a continuous whole, The phosphor particles are dispersedly embedded inside the continuous glass medium. The preparation process makes the light emitting layer of the embodiment 110 The inner dense and non-porous layer avoids the formation of a porous structure between the phosphor particles and the first glass frit particles, thereby reducing the interfacial thermal resistance caused by the voids inside the light-emitting layer 110, and improving the light-emitting layer 110. Thermal conductivity.

In a variant embodiment of the invention, the luminescent layer 110 Also included is a small amount of ethyl cellulose, a mixture of terpineol and butyl carbitol or a silicone oil which remains during the preparation of the luminescent layer 110. In preparing the light emitting layer 110 In the process of using the organic substance as a carrier, the good wettability and dispersibility can be used to make the phosphor particles and the first glass powder are more uniformly mixed. The organic carrier can be in the range of 360 to 420. At °C, it is almost completely decomposed and discharged. When the mixture of the phosphor particles and the first glass powder particles is sintered, most of the organic carrier is evaporated or decomposed and oxidized, but there is still a very small amount remaining at the interface between the phosphor particles and the glass medium. Evacuation, control reaction time, luminescent layer while reducing reaction cost and reducing residue The mixture of ethyl cellulose, terpineol and butyl carbitol or silicone oil residue in 110 accounts for 0.001% to 0.1% by mass of the light-emitting layer 110.

Reflective layer 120 A second photoluminescent material, a second adhesive, and reflective particles are included, wherein the second photoluminescent material and the reflective particles are uniformly distributed in the reflective layer 120, respectively. Reflective layer 120 The black solid sphere in the middle is the second photoluminescent material, and the second photoluminescent material is the same material as the first photoluminescent material; the reflective layer 120 in the figure The white hollow spheres in the middle are reflective particles, and the reflective particles may be single-component white diffuse reflection particles, such as alumina particles, or composite particles of two kinds of particles. In a more preferred embodiment of the present invention, the reflective particles are composite particles of alumina and titanium oxide, and the alumina is mainly used as a reflective particle, and the titanium oxide acts both as a reflection and can fill the gap between the alumina particles, and The effect is superior to the separate alumina reflective particle layer and the separate titanium oxide reflective particle layer. The alumina particles are not easy to form a dense structure, and the light will bypass the transmission of the alumina particles. Therefore, it is necessary to stack a thick aluminum oxide layer to achieve the above reflectance, and the larger the thickness of the aluminum oxide layer, the worse the thermal conductivity of the layer is. Conducive to the heat dissipation of the wavelength conversion device; and the titanium oxide has a wavelength less than 480nm The light reflectivity is not good enough to meet the performance requirements of the reflective layer reflectivity. By combining alumina and titanium oxide particles, high reflectance of visible light by alumina and easy film formation of titanium oxide can achieve higher reflectance at a thinner thickness, taking into account the reflective layer. 120 light reflectance and thermal conductivity. According to the experiment by the inventor, the output light power of the same excitation light source and the same light-emitting layer is measured, and the mass fraction of the alumina occupying the reflection layer 120 is 0.5% to 30%. When the mass fraction of the titanium oxide in the reflective layer 120 is 2% to 75%, the high-efficiency light output of the wavelength conversion device can be ensured.

In this embodiment, the second adhesive in the reflective layer 120 is a second glass frit. Specifically, the second glass frit is a glass frit of SiO ₂ -B ₂ O ₃ -RO system, wherein R is Mg, Ca, One or more of Sr, Ba, Na, K. The glass powder has excellent optical properties, reduces the loss of light when propagating in the reflective layer, thereby reducing the heat generated on the reflective layer; in addition, the flow of the glass frit is in the range of 200 ° C above the softening point. It is not very large, and it is ensured that the reflective layer 120 maintains the original flat shape in the process of high temperature treatment, and does not deform, warp, bulge, etc. due to the flow of the glass liquid. The second glass frit preferably accounts for 20 to 50% of the total mass of the reflective layer 120. When the glass powder is less than 20%, it is not enough to cover all the reflective particles and the second photoluminescent material, which is not conducive to the bonding formation of the reflective layer. When the glass powder is more than 50%, the reflective particles are too dispersed, which is not conducive to reflection. The reflection of the layer by incident light.

In a variant embodiment of the invention, the reflective layer 120 Also included is a small amount of ethyl cellulose, a mixture of terpineol and butyl carbitol or a silicone oil which remains during the preparation of the reflective layer 120. In preparing the reflective layer 120 In the process of using the organic substance as a carrier, the second photoluminescent material, the reflective particles and the second glass powder can be more uniformly mixed, and the mixture of the second photoluminescent material, the reflective particles and the second glass powder particles is sintered. At the time, most of the organic carrier is evaporated or decomposed and oxidized, but a very small amount remains in the reflective layer, and the reaction time is controlled while reducing the reaction cost and reducing the residue. The mixture of ethyl cellulose, terpineol and butyl carbitol or silicone oil residue in 120 accounts for 0.001% to 0.1% of the mass of the reflective layer 120.

In this embodiment, as shown, the light-emitting layer 110 is directly connected to the reflective layer 120 such that light and heat can be directly emitted from the light-emitting layer 110. Propagation to the reflective layer 120 avoids inefficiencies caused by propagation in a medium such as air. In a variant embodiment of the embodiment, the luminescent layer 110 may also be associated with the reflective layer 120. The sintered layer may be the light emitting layer 110 and the reflective layer 120 by a sintered layer connection. Formed together under high temperature treatment, during the high temperature treatment, the first adhesive and the second adhesive in the two layers are softened and bonded together, and the sintered layer eliminates the light emitting layer 110 and the reflective layer 120. The interface and gap between the two make the interface thermal resistance decrease.

In this embodiment, after the light emitted from the excitation light source is incident on the light-emitting layer 110, there are the following three cases:

A. The excitation light excites the first photoluminescent material in the light-emitting layer 110 to emit a laser light from the light-emitting layer 110. The incident surface exits;

B. After the excitation light is incident on the light emitting layer 110, the first photoluminescent material is converted into a laser light incident on the reflective layer 120. The laser-receiving portion is reflected back to the luminescent layer 110 by the reflective particles, and then exits from the incident surface of the luminescent layer 110, and is partially scattered by the second photo-luminescent material from the luminescent layer 110. The incident surface is emitted. Since the first photoluminescent material and the second photoluminescent material in the embodiment are the same material, the second photoluminescent material cannot be excited by the laser, and can only be scattered or absorbed in a small amount;

C. The excitation light directly passes through the light emitting layer 110 and is incident on the reflective layer 120. a part of the excitation light is converted into a laser light by the second photoluminescent material, and then emitted from the light emitting layer 110, and part of the excitation light is reflected back to the light emitting layer 110 by the reflective particles, and then converted into a laser beam by the first photoluminescent material;

Referring to FIG. 2, FIG. 2 is a heat transfer diagram of a wavelength conversion device according to Embodiment 1 of the present invention. Light emitting layer 110 The heat generated is mainly derived from the light conversion of the first photoluminescent material, and the heat generated by the reflective layer 120 is mainly derived from the light conversion of the second photoluminescent material. The heat generated by the light emitting layer 110 passes through the reflective layer 120 Upon reaching the thermally conductive substrate 130, the heat generated by the reflective layer 120 directly reaches the thermally conductive substrate 130 and then diverge. Combined with Figure 1 It can be seen that the light-emitting material in a part of the light-emitting layer is filled in the reflective layer, and on the other hand, on the reflective layer 120, relative to the prior art. The second photoluminescent material in the medium generates a short heat propagation path, which reduces the accumulation of heat in the light-emitting layer 110 and the reflective layer 120; on the other hand, reaches the reflective layer 120. The intensity of the excitation light is weakened relative to the intensity of its incident on the light-emitting layer 110, so that the heat generation amount of the second photoluminescent material itself in the reflective layer 120 is reduced.

In contrast to the technical solution of separating the photoluminescent material and the reflective layer, the inventors embed the photoluminescent material into the reflective layer, and the initial emitted light intensity is the same under the same excitation light illumination, as time passes. The wavelength conversion device of the present embodiment has a small attenuation of the emitted light. Reflected by many experiments 120% contains 1%~75% When the mass fraction of the second photoluminescent material is used, the wavelength conversion device can have better performance. When the content of the second photoluminescent material is too low, the effect of shortening the heat propagation path of the reflective layer is not obvious, and when the phosphor content is too large, The reflection and scattering properties of the reflective layer are too low. In a more preferred embodiment of the invention, the phosphor content is 10%~45% quality score.

In this embodiment, the thickness of the reflective layer 120 is 50 μm, and the thickness of the reflective layer 120 can be determined by experiments. When the thickness is less than 20 μm, the reflective layer 120 cannot completely reflect the light to the light-emitting layer. In this case, light is incident on the thermally conductive substrate, causing a large increase in energy loss and heat.

The thermally conductive substrate 130 is a ceramic substrate. As shown, the ceramic substrate 130 is disposed on the reflective layer 120 away from the luminescent layer 110. One side. In this embodiment, the ceramic substrate 130 is directly connected to the reflective layer 120. In other modified embodiments, the ceramic substrate 130 It can also be joined by a sintered layer or other transition layer. The sintered layer may be formed by the ceramic substrate 130 and the reflective layer 120 under high temperature treatment. During the high temperature processing, the reflective layer 120 The second adhesive in the softening is easily bonded to the ceramic material, and the sintered layer eliminates the reflective layer 120 and the ceramic substrate 130. The interface and gap between the two make the interface thermal resistance decrease. The ceramic substrate 130 using an aluminum nitride substrate in this embodiment 130 The substrate is resistant to high temperature, is not easily oxidized, and has good thermal conductivity. The ceramic substrate may also be selected from materials such as alumina, silicon carbide, and silicon nitride. The thermally conductive substrate 130 is not a necessary layer structure in the reflective layer 120 In the case of having good heat dissipation performance, the heat conductive substrate 130 can be omitted.

Embodiment 2

See Figure 3, Figure 3 The structure of the wavelength conversion device according to the second embodiment of the present invention is different from the first embodiment in that the second photoluminescent material (shown by the hatched ball in the figure) and the light in the reflective layer 120 are different. Layer 110 The first photoluminescent material (black solid sphere in the figure) is different, and the light emitted by the first photoluminescent material can excite the second photoluminescent material and emit longer wavelength light.

After the first photoluminescent material is excited by the excitation light, the emitted laser energy is reduced and the wavelength is longened, and the heat generated by the laser excited second photoluminescent material directly excites the second photoluminescent material with respect to the excitation light. cut back. In visible light phosphors, some long-wavelength phosphors, such as long-wavelength yellow phosphors, orange phosphors, and red phosphors, have higher calorific value. If they are exposed to high-energy lasers, they are prone to decrease in efficiency due to intense heat generation. If these powders are used with low-calorie phosphors, their temperature rise will not only affect their own efficiency, but also affect the efficiency of other low-calorie phosphors.

In this embodiment, the first photoluminescent material is a yellow phosphor, which is excited by blue light to emit yellow light, and the second photoluminescent material is a red phosphor, which is excited by the green light component in the blue light and the yellow light to emit red light. For the red phosphor, the heat generated by the blue light directly excited by the blue light is much higher than the heat generated by the short-wavelength component of the yellow light, and the red phosphor has poor thermal stability and is easy to work in the long-term high temperature. Deterioration, so the improvement of its heat dissipation is especially important. In the prior art, since the blue light and ultraviolet light source used to excite the red phosphor are low-power light sources or non-laser light sources, the heat dissipation problem of the red phosphors is not obvious.

In this embodiment, with respect to the technical solution of separating the photoluminescent material from the reflective layer, the inventor embeds the second photoluminescent material into the reflective layer, and the initial emitted light intensity is the same under the same excitation light irradiation. Over time, the wavelength conversion device of the present embodiment has a small attenuation of the emitted light. Reflected by many experiments 120% contains 1%~75% When the mass fraction of the second photoluminescent material is used, the wavelength conversion device can have better performance. When the content of the second photoluminescent material is too low, the effect of shortening the heat propagation path of the reflective layer is not obvious, and when the phosphor content is too large, The reflection and scattering properties of incident light and excitation light are too low. In a more preferred embodiment of the invention, the phosphor content is 10%~45% quality score.

Embodiment 3

4 is a schematic structural view of a color wheel according to a third embodiment of the present invention, and 4a is a sectional view of the color wheel, 4b. A top view of the color wheel. The color wheel is a circular color wheel disk comprising a light emitting layer 110, a reflective layer 120 and a ceramic substrate 130. The light emitting layer 110, the reflective layer 120 and the ceramic substrate 130 For the structural composition, reference may be made to the description of the wavelength conversion device in the first embodiment and the second embodiment.

In the present embodiment, the light emitting layer 110, the reflective layer 120, and the ceramic substrate 130 All of them are annular structures. In a modified embodiment of the present invention, the light-emitting layer 110, the reflective layer 120, and the ceramic substrate 130 may have a solid circular layer structure. Light emitting layer 110 and reflective layer 120 They may each be a fan-ring structure, for example, respectively, formed by three 120 ° fan rings.

The wavelength conversion device of the color wheel disc structure of the embodiment can be rotated around its central axis under the driving of a driving device such as a motor, and a laser beam is used to illuminate the surface of the luminescent layer to form a spot. When the color wheel disk rotates, the spot is excited by a circular path. Luminous layer The photoluminescent material in 110 avoids long-term exposure to a spot area and causes the photoluminescent material to be thermally quenched. In this way, the excited light source with high power and long life can be used.

The invention further relates to a light-emitting device comprising the above-mentioned wavelength conversion device, further comprising an excitation light source, wherein the excitation light source is a laser light source, located on a side of the light-emitting layer away from the reflective layer, and the excitation light source emits excitation light incident on the light-emitting layer.

The invention further relates to a projection device comprising the above-described illumination device.

The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

1. A wavelength conversion device comprising:

Laminated light and reflective layers,

The luminescent layer includes a first photoluminescent material and a first adhesive;

The reflective layer includes a second photoluminescent material, a second adhesive, and reflective particles;

Light emitted from the reflective layer is completely emitted through the luminescent layer;

The luminescent layer is directly connected to the reflective layer or connected by a sintered layer.

2, according to claim 1 The wavelength conversion device is characterized in that the light emitted by the first photoluminescent material excites the second photoluminescent material and causes the second photoluminescent material to emit light of a longer wavelength.

3, according to claim 2 The wavelength conversion device is characterized in that the first photoluminescent material is a phosphor that can be excited by yellow light, and the second photoluminescent material is a phosphor that can be excited by red light.

4. A wavelength conversion device according to claim 1 wherein the reflective particles comprise titanium oxide and aluminum oxide.

The wavelength conversion device according to claim 4, wherein the reflective layer has a mass fraction of alumina of 0.5% to 30%. The mass fraction of titanium oxide is 2% to 75%.

The wavelength conversion device according to any one of claims 1 to 5, wherein the second photoluminescent material occupies a mass fraction of the reflective layer 1%~75%.

The wavelength conversion device according to claim 6, wherein the second photoluminescent material accounts for 10% to 45% of the mass of the reflective layer.

The wavelength conversion device according to claim 6, wherein the second adhesive accounts for 20 to 50% of the mass of the reflective layer. .

The wavelength conversion device according to claim 8, wherein the second adhesive is a glass powder of a SiO ₂ -B ₂ O ₃ -RO system, wherein R is Mg, Ca, Sr, Ba, One or more of Na and K.

The wavelength conversion device according to claim 1, wherein the reflective layer has a thickness of 20 to 100 μm.

11 according to claim 1 The wavelength conversion device is characterized in that the reflective layer comprises ethyl cellulose, terpineol, butyl carbitol or silicone oil, and the mass fraction of the reflective layer is 0.001% to 0.1%.

The wavelength conversion device according to claim 1, wherein the first adhesive is SiO ₂ -B ₂ O ₃ -RO , SiO ₂ -TiO ₂ -Nb ₂ O ₅ -R' ₂ O Or one or more of ZnO-P ₂ O ₅ , wherein R is selected from one or more of Mg, Ca, Sr, Ba, Na, K, and R′ is selected from one of Li, Na, K Kind or more.

13. According to claim 1 The wavelength conversion device further includes a ceramic substrate disposed on a side of the reflective layer away from the light emitting layer and laminated with the reflective layer, the ceramic substrate being directly connected to the reflective layer or Connected through a sintered layer.

The wavelength conversion device according to claim 13, wherein the ceramic substrate is an aluminum nitride substrate.

15 according to claim 1 The wavelength conversion device is characterized in that the wavelength conversion device is a circular or circular color wheel, the light emitting layer is distributed in a circular or fan-shaped shape, and the reflective layer is circular or fan-shaped. Circular distribution.

16. A lighting device comprising the claims 1 to 15 The wavelength conversion device according to any one of the preceding claims, further comprising an excitation light source, the excitation light source is located on a side of the light emitting layer away from the reflective layer, and the excitation light source emits excitation light incident on the light emitting layer.

17. A projection apparatus comprising the illumination apparatus of claim 16.