WO2016173527A1 - 一种波长转换装置、荧光色轮及发光装置 - Google Patents

一种波长转换装置、荧光色轮及发光装置 Download PDF

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Publication number
WO2016173527A1
WO2016173527A1 PCT/CN2016/080643 CN2016080643W WO2016173527A1 WO 2016173527 A1 WO2016173527 A1 WO 2016173527A1 CN 2016080643 W CN2016080643 W CN 2016080643W WO 2016173527 A1 WO2016173527 A1 WO 2016173527A1
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Prior art keywords
wavelength conversion
conversion device
phosphor
light
titanium oxide
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PCT/CN2016/080643
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English (en)
French (fr)
Inventor
李乾
陈雨叁
王艳刚
许颜正
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to US15/570,441 priority Critical patent/US20180158995A1/en
Publication of WO2016173527A1 publication Critical patent/WO2016173527A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
    • G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials
    • H10H20/8513—Wavelength conversion materials having two or more wavelength conversion materials
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/23—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  for the control of the colour
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/84—Coatings, e.g. passivation layers or antireflective coatings
    • H10H20/841—Reflective coatings, e.g. dielectric Bragg reflectors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
    • H10H20/8512—Wavelength conversion materials
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/858—Means for heat extraction or cooling
    • H10H20/8583—Means for heat extraction or cooling not being in contact with the bodies
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8515—Wavelength conversion means not being in contact with the bodies

Definitions

  • the invention relates to the field of wavelength conversion illumination, in particular to a wavelength conversion device, a fluorescent color wheel and a light-emitting device suitable for a high-power laser light source.
  • LED and LD Solid-state light sources play an increasingly important role in high-brightness, high-power lighting.
  • LED or LD can provide white light directly, so LED or LD
  • the light source of the light-emitting element is obtained by obtaining red, green, and blue light of the three primary colors and combining the light to obtain white light.
  • the primary color light is usually obtained by using the multi-color segment color wheel, and then the white light is obtained by means of time-series combining light, in this way, the white light efficiency is low, and the white light is not independent. modulation.
  • white LED lighting uses a combination of blue LED and YAG phosphor to obtain white light, which passes through the blue LED.
  • the YAG phosphor is excited to obtain yellow light, and then the yellow light and the blue light are combined to obtain white light.
  • YAG will be The phosphor is coated with a transparent medium, and the blue light is partially absorbed as it passes through the transparent medium, resulting in a transparent medium and YAG.
  • the temperature of the phosphor rises, resulting in a decrease in the luminous efficiency of the phosphor. This situation becomes more apparent with the gradual increase of the excitation light power.
  • the present invention provides a wavelength conversion device suitable for a high-power excitation light source, which has less absorption of excitation light, less heat generation, and good reliability.
  • the invention provides a wavelength conversion device comprising a light-reflecting layer, the light-emitting
  • the reflective layer comprises a wavelength converting material, aluminum oxide, titanium oxide, and a binder.
  • the invention also provides a fluorescent color wheel, comprising the above wavelength conversion device, the light conversion device -
  • the reflective layer is distributed in a circular or fan-shaped shape.
  • the invention also provides a light emitting device comprising the above wavelength converting device, further comprising an excitation light source, the excitation light source being a solid state light source.
  • the present invention includes the following beneficial effects:
  • a light-emitting material comprising a wavelength converting material, alumina, titania and a binder
  • the reflective layer places the wavelength converting material and the reflective material in the same layer, so that when the excitation light is incident on the layer, part of the excitation light can be directly reflected out of the layer, thereby reducing the medium caused by the excitation light propagating in the layer.
  • the density and thermal conductivity of the reflective layer not only reduces the heat generation of the wavelength conversion device, but also enhances the heat dissipation performance of the wavelength conversion device, making it suitable for a higher power excitation light source.
  • FIG. 1 is a schematic structural diagram of a wavelength conversion device according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of a wavelength conversion device according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic structural diagram of a wavelength conversion device according to Embodiment 3 of the present invention.
  • FIG. 4 is a schematic structural view of a fluorescent color wheel according to Embodiment 4 of the present invention.
  • the wavelength conversion device includes a light-reflecting layer 110.
  • the illuminating-reflecting layer 110 includes a wavelength converting material 210, titanium oxide particles 220, alumina particles 230, and an adhesive 240, and a light-reflecting layer 110 It has the function of reflecting incident light, and also has the function of emitting laser light after being excited.
  • the wavelength converting material is used to convert the wavelength of the excitation light from the excitation light source into a laser light, and the wavelength conversion material 210 is distributed in the light emission - In the reflective layer 110, a luminescent center and a heat generating center are formed.
  • the titanium oxide particles 220 and the aluminum oxide particles 230 are reflected and distributed in the gaps of the wavelength converting material 210 particles, wherein the titanium oxide particles 220 has better reflectance for light with wavelengths greater than 550 nm, and poor reflectivity for short-wave visible light, while alumina particles 230 have a wavelength of less than 480 nm for blue light.
  • the light has a good reflectivity.
  • the use of a single reflective particle i.e., alumina particles or titanium oxide particles
  • the present invention employs alumina particles 230.
  • titanium oxide particles 220 A combination of ways. Further, the inventors combined the alumina particles and the titanium oxide particles to find that the mixed reflective particles are extremely easy to form a film and fill the gaps between the particles, so that the mixed layer can achieve a higher reflectance in a smaller amount.
  • glue 240 is used to bond the wavelength converting material 210, the titanium oxide particles 220, and the alumina particles 230 into a layer.
  • the wavelength converting material 210 is YAG:Ce Phosphor
  • the phosphor has high luminous efficiency
  • the particle size of the phosphor is larger than that of the titanium oxide particles 220 and the alumina particles 230.
  • the large particle size YAG:Ce The phosphor has high luminous efficiency.
  • the smaller diameter of the titanium oxide particles and the aluminum oxide particles can be filled into the voids of the large-sized phosphor to cause light emission.
  • the reflective layer is more dense.
  • the wavelength conversion material may also select a combination of two or more phosphors, such as a mixed phosphor of a green phosphor and a red phosphor, which is illuminated by blue light. The reflective layer simultaneously emits red, green and blue primary colors, and the amount of green phosphor and red phosphor can be adjusted to adjust the white balance.
  • the phosphor has a particle size ranging from 1 to 50 ⁇ m. In a more preferred embodiment of the embodiment, the phosphor has a particle size range of 10 ⁇ 20 ⁇ m, if the particle size is too small, the luminescence intensity is low, and if the particle size is too large, it is not easy to form.
  • Alumina and titanium oxide have a particle size range of 0.05 ⁇ 5 ⁇ m
  • the alumina and the titanium oxide have a particle size ranging from 0.1 to 1 ⁇ m, and if the particle diameter is too small, the porous structure of the adhesive is likely to occur, which affects the light emission.
  • the thermal conductivity of the reflective layer, while the excessively large particle size is not conducive to filling the gap of the phosphor particles, resulting in an increase in the thickness of the luminescent-reflective layer.
  • the wavelength conversion material phosphor 210 accounts for 20% to 60% of the mass of the illuminating-reflecting layer 110.
  • the titanium oxide particles 220 account for 0.1% to 5% by mass of the reflective layer 110
  • the alumina particles 230 account for the mass of the light-reflecting layer 110. 0.1% ⁇ 5% .
  • the titanium oxide particles and the alumina particles have a small particle diameter, and the small particle diameter particles tend to cause voids when the binder is coated, so that the content of the titanium oxide particles and the alumina particles cannot be excessive.
  • the titanium oxide particles and the alumina particles also need to be ensured in a sufficient amount.
  • the wavelength conversion material phosphor 210 occupies a mass percentage of the luminescent-reflective layer 110. 35% to 55%, titanium oxide particles 220 account for 0.1% to 1% by mass of the light-reflecting layer 110, and alumina particles 230 account for the light-reflecting layer 110 The mass percentage is 0.1% ⁇ 1%.
  • the adhesive is continuously distributed, that is, the light-reflecting layer 110 Any of the adhesives may reach another point in the adhesive without crossing any interface, or only the adhesive in a portion of the area needs to reach the adhesive in other areas across the interface.
  • This continuously distributed structure has good thermal and compressive properties, and heat transfer within its interior does not require an interface, ie, reduces interface thermal resistance.
  • the mass percentage of the adhesive is 40% ⁇ 80%, in a better embodiment, the mass percentage of the adhesive is 45% ⁇ 65%.
  • the adhesive in this embodiment is a glass medium which is continuously distributed.
  • the glass medium can be selected from SiO 2 -B 2 O 3 -RO , SiO 2 -TiO 2 -Nb 2 O 5 -R' 2 O , ZnO-P 2 O 5 One or more of them, wherein R is one or more of Mg, Ca, Sr, Ba, Na, K, and R' is one or more of Li, Na, K.
  • the adhesive may also be silicone or silicone, which is suitable for use in lower power excitation sources.
  • FIG. 2 is a schematic structural diagram of a wavelength conversion device according to Embodiment 2 of the present invention.
  • the wavelength conversion device includes illumination - The reflective layer 110 and the substrate 130.
  • the substrate 130 The aluminum nitride ceramic substrate has a high thermal conductivity and has a better bonding property with the luminescent-reflective layer 110 containing aluminum oxide and titanium oxide.
  • the substrate 130 can also be other ceramic substrates, such as An alumina substrate, a boron nitride substrate, a silicon nitride substrate, a silicon carbide substrate, or a hafnium oxide substrate.
  • the substrate 130 may also be a metal substrate such as an aluminum substrate or a copper substrate, which has more excellent thermal conductivity.
  • a metal substrate such as an aluminum substrate or a copper substrate, which has more excellent thermal conductivity.
  • the adhesive in 110 is a glass medium
  • the metal substrate and the light - A metallization layer or a solder layer is further included between the reflective layers to make the combination of the two more stable; when the adhesive is silica gel or silicone, there is no need to increase the metallization layer.
  • the substrate 130 may also be an alloy layer of metal and ceramic, such as an alloy layer of aluminum metal and aluminum nitride, which combines the high thermal conductivity of aluminum metal with the low coefficient of thermal expansion of aluminum nitride, and is easily combined with the luminescent-reflective layer.
  • an alloy layer of metal and ceramic such as an alloy layer of aluminum metal and aluminum nitride, which combines the high thermal conductivity of aluminum metal with the low coefficient of thermal expansion of aluminum nitride, and is easily combined with the luminescent-reflective layer.
  • FIG. 3 is a schematic structural diagram of a three-wavelength conversion device according to an embodiment of the present invention.
  • the wavelength conversion device comprises a light-reflecting layer 110, pure reflective layer 120 and substrate 130.
  • the third embodiment differs only in that the pure reflective layer 120 between the light-reflecting layer 110 and the substrate 130 is added.
  • the pure reflective layer 120 is used to reflect light passing through the illuminating-reflecting layer 110 back.
  • the pure reflective layer 120 comprises aluminum oxide, titanium oxide and a binder, and the adhesive is luminescent - The same adhesive is applied to the reflective layer, so that the two layers can be tightly bonded without peeling off due to changes in external force or temperature.
  • Alumina has excellent reflectance for visible light, and pure alumina layer can reflect visible light up to 90%. However, due to the large gap between the particles of alumina, 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 greater the thickness of the aluminum oxide layer, the thermal conductivity of the layer. The worse. Titanium oxide itself has a certain reflectivity, especially for wavelengths greater than 550nm light has better reflectivity, but 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.
  • alumina and titanium oxide reveals that the mixed reflective layer is easily formed into a film, and the titanium oxide fills the voids between the alumina particles while utilizing its own reflection characteristics to ensure that light passing through between the alumina particles is partially reflected. go back. This allows the mixed layer to achieve a higher reflectance at a thinner thickness. Further, titanium oxide has better wettability with respect to alumina and a softened adhesive (such as glass frit, silica gel or silicone resin), and it is difficult to form closed bubbles inside.
  • a softened adhesive such as glass frit, silica gel or silicone resin
  • the alumina particles account for 1% to 60% by mass of the pure reflective layer 120.
  • the titanium oxide particles account for 1% to 40% by mass of the pure reflective layer 120, and the adhesive accounts for 30% to 70% by mass of the pure reflective layer 120.
  • the light-reflecting layer 110 and the pure reflective layer 120 It is combined by means of co-sintering. Before sintering, the two are layered in the form of dried slurry, so that the two can be layered after the same sintering process, ensuring the uniformity of the overall wavelength conversion device.
  • FIG. 4 is a schematic structural diagram of a fluorescent color wheel according to Embodiment 4 of the present invention.
  • Fluorescent color wheel 100 includes illumination - reflective layer 110, pure reflective layer 120, substrate 130 and driving device 140.
  • Luminescence - reflective layer 110, pure reflective layer 120 and substrate 130 See the description in the above embodiment for the setting.
  • the drive unit 140 is used to drive the substrate to rotate about its central axis.
  • the substrate 130 has a disk shape, a light-reflecting layer 110 and a pure reflective layer 120. It is round.
  • the illuminating-reflecting layer 110 may also be formed by arranging a plurality of fan rings. Referring to the description in the first embodiment, the pure reflective layer 120 is not necessary and is illuminated - In the case where the reflective layer 110 cannot be permeable to light, the light-reflecting layer 110 may be directly coupled to the substrate 130.
  • the embodiment is further modified on the basis of the fourth embodiment.
  • the fluorescent color wheel of the embodiment is a multi-segment color wheel.
  • the color wheel is sequenced. Light of different wavelength ranges is emitted.
  • the luminescent layer of the color wheel includes white light emitting light as described in the first embodiment above. - a reflective layer, the luminescent layer further comprising an illuminating color segment which is composed of a phosphor and a binder (excluding titanium oxide and aluminum oxide) capable of emitting other light.
  • the luminescent layer can be illuminated by white light -
  • the reflective layer, the green phosphor layer, the red phosphor layer and the transparent diffusion layer are combined.
  • the color wheel and the blue excitation light source can realize the four-color color of red, green, blue and white, which greatly improves the brightness and the luminous efficiency.
  • the luminescent layer can also be illuminated by white light.
  • the reflective layer and other illuminating color segments whose spectral range is narrower than white light which belongs to the technical solution of the above-mentioned fluorescent color wheel which emits red, green, blue and white four-segment colors.
  • the invention also provides a light-emitting device, which uses the wavelength conversion device in the above embodiment as a light-emitting component, and further comprises an excitation light source, which is a solid-state light source, such as LD or LED The excitation light source is used to excite the wavelength conversion device to emit a laser.
  • an excitation light source which is a solid-state light source, such as LD or LED
  • the excitation light source is used to excite the wavelength conversion device to emit a laser.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Luminescent Compositions (AREA)
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Abstract

提供一种波长转换装置以及包括该波长转换装置的荧光色轮和发光装置。其中波长转换装置包括发光-反射层（110），该发光-反射层（110）包含波长转换材料（210）、氧化铝（220）、氧化钛（230）和粘接剂（240），不仅减少了激发光在发光-反射层（110）中传播而导致的发热，而且提高了发光-反射层（110）的致密度和散热性能，从而能够适用于更大功率的激发光源。

Description

一种波长转换装置、荧光色轮及发光装置 技术领域
本发明涉及波长转换发光领域，特别是涉及一种适用于大功率激光光源的波长转换装置、荧光色轮及发光装置。
背景技术
在目前的照明和投影领域，随着人们在生产和生活中对亮度的需求逐渐提高，直接发出白光的灯泡作为光源越来越无法满足发光需要。 LED 和 LD 的固态光源在高亮度高功率照明领域扮演着越来越重要的角色。
技术问题
然而 LED 和 LD 都无法直接提供白光，因此以 LED 或 LD 为发光元件的光源，都是通过获得红绿蓝三基色光后合光而得到白光。尤其在激发光激发荧光色轮的应用中，通常利用多色段色轮获得各基色光，然后通过时序合光的方式来获得白光，以这种方式获得白光效率低，且不利于白光的独立调制。
另一方面，白光 LED 照明采用蓝 LED 与 YAG 荧光粉结合的方式获得白光，其通过蓝光 LED 激发 YAG 荧光粉获得黄光，然后将黄光与蓝光合光得到白光。该技术方案中，将 YAG 荧光粉用透明介质包覆成层，蓝光在穿过该透明介质时被部分吸收，导致透明介质和 YAG 荧光粉的温度升高，导致荧光粉的发光效率下降。这种情况随着激发光功率的逐渐提高而愈发明显
 技术解决方案
针对上述现有技术中的 YAG 荧光粉层发热的缺陷，本发明提供一种适用于大功率激发光源的波长转换装置，其对激发光的吸收更少，发热量少、可靠性良好。
本发明提供了一种波长转换装置，包括发光 - 反射层，该发光 - 反射层包含波长转换材料、氧化铝、氧化钛和粘接剂。
本发明还提供了一种荧光色轮，包括上述波长转换装置，该波长转换装置的发光 - 反射层呈圆环形或扇环形分布。
本发明还提供了一种发光装置，包括上述波长转换装置，还包括一激发光源，该激发光源为固态光源。
 有益效果
与现有技术相比，本发明包括如下有益效果：
通过采用包含波长转换材料、氧化铝、氧化钛和粘接剂的发光 - 反射层，将波长转换材料与反射材料置于同一个层内，使得激发光在入射于该层时，部分激发光可以被直接反射出该层，减少了激发光在层内传播而导致的介质温度升高；同时，氧化铝和氧化钛以较少的量实现较高的反射率，并填充了波长转换材料大颗粒之间的空隙，提高了发光 - 反射层的致密度和导热性能，不仅减少波长转换装置的发热量，而且增强了波长转换装置的散热性能，从而使其能够适用于更大功率的激发光源。
 附图说明
图 1 为本发明实施例一的波长转换装置的结构示意图；
图 2 为本发明实施例二的波长转换装置的结构示意图；
图 3 为本发明实施例三的波长转换装置的结构示意图；
图 4 为本发明实施例四的荧光色轮的结构示意图 。
 本发明的最佳实施方式
下面结合附图和实施方式对本发明实施例进行详细说明。
实施例一
请参见图 1 ，图 1 为本发明实施例一的波长转换装置的结构示意图，该波长转换装置包括发光 - 反射层 110 ，该发光 - 反射层 110 包括波长转换材料 210 、氧化钛颗粒 220 、氧化铝颗粒 230 和粘接剂 240 ，发光 - 反射层 110 既有反射入射光的功能，同时也具有受激发后发出受激光的功能。
其中，波长转换材料用于将来自激发光源的激发光波长转换为受激光，波长转换材料 210 分布于发光 - 反射层 110 中，形成发光中心和发热中心。氧化钛颗粒 220 和氧化铝颗粒 230 起反射作用，分布于波长转换材料 210 颗粒的间隙中，其中氧化钛颗粒 220 对波长大于 550nm 的光具有较好的反射率，对短波可见光的反射率不佳，而氧化铝颗粒 230 对蓝光尤其是波长小于 480nm 的光具有较好的反射率。对于宽谱光尤其是白光，单独采用一种反射颗粒（即氧化铝颗粒或氧化钛颗粒）无法达到理想的反射，因此本发明采用将氧化铝颗粒 230 与氧化钛颗粒 220 相结合的方式。此外，发明人将氧化铝颗粒和氧化钛颗粒结合后发现，该混合反射颗粒极易成膜并填补颗粒间的空隙，使得该混合层能够以较少的量达到较高的反射率。粘接剂 240 用于将波长转换材料 210 、氧化钛颗粒 220 和氧化铝颗粒 230 粘接成层。
在本实施例中，波长转换材料 210 为 YAG:Ce 荧光粉，该荧光粉的发光效率高，荧光粉的粒径大于氧化钛颗粒 220 和氧化铝颗粒 230 的粒径，一方面，大粒径的 YAG:Ce 荧光粉的发光效率高，另一方面，氧化钛颗粒和氧化铝颗粒的粒径较小则可以填充到大粒径荧光粉的空隙中，使发光 - 反射层更加致密。在本发明的其他实施例中，波长转换材料也可以选择两种或两种以上荧光粉的组合，例如绿色荧光粉与红色荧光粉的混合荧光粉，在蓝光的照射下，该发光 - 反射层同时发出红绿蓝三基色光，而且可以分别调节绿色荧光粉和红色荧光粉的量来调节白平衡。
荧光粉的粒径范围为 1~50 μ m ，在本实施例的一个更优选的实施方案中，荧光粉的粒径范围为 10~20 μ m ，粒径过小则发光强度偏低，而粒径过大则不容易成型。
氧化铝和氧化钛的粒径范围为 0.05~5 μ m ，在本实施例的一个更优选的实施方案中，氧化铝和氧化钛的粒径范围为 0.1~1 μ m ，粒径过小则容易使粘接剂出现多孔状结构，影响发光 - 反射层的导热性能，而粒径过大则不利于填充荧光粉颗粒间隙，导致发光 - 反射层厚度增加。
本实施例中，波长转换材料荧光粉 210 占发光 - 反射层 110 的质量百分比为 20%~60% ，氧化钛颗粒 220 占发光 - 反射层 110 的质量百分比为 0.1%~5% ，氧化铝颗粒 230 占发光 - 反射层 110 的质量百分比为 0.1%~5% 。氧化钛颗粒和氧化铝颗粒的粒径较小，小粒径颗粒容易导致粘接剂包覆时产生空隙，因此氧化钛颗粒和氧化铝颗粒的含量不能过多。同时，为保证最够的反射率，氧化钛颗粒和氧化铝颗粒也需要保证足够多的量。
在一个更优选的实施方案中，波长转换材料荧光粉 210 占发光 - 反射层 110 的质量百分比为 35%~55% ，氧化钛颗粒 220 占发光 - 反射层 110 的质量百分比为 0.1%~1% ，氧化铝颗粒 230 占发光 - 反射层 110 的质量百分比为 0.1%~1% 。
本实施例中，粘接剂呈连续分布，即发光 - 反射层 110 中的粘接剂中任一点都可以不跨过任何界面而到达粘接剂中的另一点，或着仅有部分区域内的粘接剂需要跨过界面到达其他区域内的粘接剂。这种连续分布的结构具有良好的导热和抗压性能，热量在其内部传输不需要经过界面，即减少了界面热阻。为达到这种连续分布，必须有足够多的粘接剂含量，同时为保证波长转换材料的利用率，粘接剂的量不能过多。在本实施例中，粘接剂的质量百分比为 40%~80% ，在一个更优的实施方式中，粘接剂的质量百分比为 45%~65% 。
本实施例中的粘接剂为玻璃介质，该玻璃介质呈连续分布。为保证透光性、导热性和耐温性，该玻璃介质可以选择 SiO2-B2O3-RO 、 SiO2-TiO2-Nb2O5-R' 2O 、 ZnO-P2O5 中的一种或多种，其中 R 为 Mg 、 Ca 、 Sr 、 Ba 、 Na 、 K 中的一种或多种， R' 为 Li 、 Na 、 K 中的一种或多种。
在本发明的其他实施方式中，粘接剂也可以为硅胶或硅树脂，该粘接剂适用于较低功率的激发光源发光。
实施例二
请参见图 2 ，图 2 为本发明实施例二的波长转换装置的结构示意图。其中波长转换装置包括发光 - 反射层 110 和基板 130 。
发光 - 反射层 110 参照实施例一中的设置，基板 130 为氮化铝陶瓷基板，该基板热导率高，且与包含氧化铝和氧化钛的发光 - 反射层 110 具有更好的结合性能。
在其他的变形实施方案中，基板 130 也可以为其他陶瓷基板，如 氧化铝基板、氮化硼基板、氮化硅基板、碳化硅基板、氧化铍基板。
基板 130 也可以为金属基板，例如铝基板或铜基板，金属基板具有更优异的导热性能。当发光 - 反射层 110 中的粘接剂为玻璃介质时，金属基板与发光 - 反射层之间还包括一金属化层或焊接层，以使两者结合更加稳定；当粘接剂为硅胶或硅树脂时，则不需要增加金属化层。
此外，基板 130 还可以是金属与陶瓷的合金层，例如铝金属与氮化铝的合金层，该层兼顾铝金属的高导热与氮化铝的低热膨胀系数，而且易与发光 - 反射层结合。
实施例三
请参见图 3 ，图 3 为本发明实施例三波长转换装置的结构示意图。其中波长转换装置包括发光 - 反射层 110 、纯反射层 120 和基板 130 。与实施例二相比，实施例三的区别仅在于增加了位于发光 - 反射层 110 和基板 130 之间的纯反射层 120 ，纯反射层 120 用于将穿过发光 - 反射层 110 的光反射回去。
纯反射层 120 包含氧化铝、氧化钛和粘接剂，该粘接剂为与发光 - 反射层相同的粘接剂，从而使得两层能够紧密结合，不因外力或温度的变化而发生剥离等现象。
氧化铝对可见光有优良的反射率，纯的氧化铝层对可见光的反射率可达到 90% ，然而由于氧化铝各颗粒间的空隙大，光线会绕过氧化铝颗粒透射，因此需要堆叠较厚的氧化铝层才能够达到上述反射率，而氧化铝层厚度越大，层体的导热性能越差。氧化钛本身具有一定的反射率，尤其对波长大于 550nm 的光具有较好的反射率，然而氧化钛对波长小于 480nm 的光反射率不佳，不能满足反射层反射率的性能需求。将氧化铝和氧化钛后结合发现，该混合反射层极易成膜，氧化钛填补了氧化铝颗粒间的空隙，同时利用自身的反射特性保证从氧化铝颗粒之间部分穿过的光被反射回去。因此使得该混合层能够在较薄的厚度下达到较高的反射率。此外，氧化钛相对于氧化铝，与软化后的粘接剂（如玻璃粉、硅胶或硅树脂）具有更好的浸润性，不易在内部形成封闭气泡。
本实施例中，为达到更好的反射效果，氧化铝颗粒占纯反射层 120 质量百分比为 1%~60% ，氧化钛颗粒占纯反射层 120 的质量百分比为 1%~40% ，粘接剂占纯反射层 120 的质量百分比为 30%~70% 。
在本实施例中，发光 - 反射层 110 和纯反射层 120 是通过共同烧结的方式结合的，烧结前，两者以烘干的浆料的形态叠加成层，这样两者可以经过相同的烧结过程后成层，保证了整体波长转换装置的均匀性。
实施例四
请参见图 4 ，图 4 为本发明实施例四的荧光色轮的结构示意图。荧光色轮 100 包括发光 - 反射层 110 、纯反射层 120 、基板 130 和驱动装置 140 。发光 - 反射层 110 、纯反射层 120 和基板 130 的设置参见上述实施例中的描述。驱动装置 140 用于驱动基板绕其中心轴旋转。
本实施例中，基板 130 为圆盘形，发光 - 反射层 110 和纯反射层 120 呈圆环形。在本发明的其他实施方式中，发光 - 反射层 110 也可以为多各扇环形拼接而成。参照实施例一中的描述，纯反射层 120 并非必须的，在发光 - 反射层 110 无法被光穿过的情况下，也可以直接将发光 - 反射层 110 与基板 130 连结。
实施例五
本实施例在实施例四的基础上进一步变形，本实施例的荧光色轮为多段式色轮，当激发光以形成光斑的形式照射到旋转的色轮的发光面上时，色轮依时序发射出不同波长范围的光。色轮的发光层包括如上述实施例一所述的发出白光的发光 - 反射层，发光层还包括由荧光粉和粘接剂组成（不含氧化钛和氧化铝）的能够发出其他光的发光色段。例如，发光层可以由发出白光的发光 - 反射层、绿光荧光粉层、红光荧光粉层和透明扩散层组成，该色轮配合蓝色激发光源可以实现出射红绿蓝白四段色，极大的提升了发光亮度和发光效率。当然，发光层也可以由发出白光的发光 - 反射层和其他光谱范围窄于白光的发光色段组成，该种类型属于与上述出射红绿蓝白四段色的荧光色轮为简单替代的技术方案。
本发明还提供了一种发光装置，该发光装置应用上述实施例中的波长转换装置作为发光组件，还包括一激发光源，该激发光源为固态光源，如 LD 或 LED 了，激发光源用于激发波长转换装置发出受激光。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (14)

1 、一种波长转换装置，其特征在于，包括发光 - 反射层，所述发光 - 反射层包含波长转换材料、氧化铝、氧化钛和粘接剂。
2 、根据权利要求 1 所述的波长转换装置，其特征在于，所述波长转换材料为荧光粉，该荧光粉的粒径大于所述氧化铝和氧化钛的粒径，所述荧光粉为 YAG:Ce 荧光粉，或者为绿色荧光粉与红色荧光粉的混合荧光粉。
3 、根据权利要求 2 所述的波长转换装置，其特征在于，所述荧光粉的粒径为 1~50 μ m ，氧化铝的粒径为 0.05~5 μ m ，氧化钛的粒径为 0.1~5 μ m 。
4 、根据权利要求 3 所述的波长转换装置，其特征在于，所述荧光粉的粒径为 10~20 μ m ，氧化铝的粒径为 0.1~1 μ m ，氧化钛的粒径为 0.1~1 μ m 。
5 、根据权利要求 1 所述的波长转换装置，其特征在于，所述波长转换材料占所述发光 - 反射层的质量百分比为 20%~60% ，氧化铝占所述发光 - 反射层的质量百分比为 0.1%~5% ，氧化钛占所述发光 - 反射层的质量百分比为 0.1%~5% 。
6 、根据权利要求 5 所述的波长转换装置，其特征在于，所述波长转换材料占所述发光 - 反射层的质量百分比为 35%~55% ，氧化铝占所述发光 - 反射层的质量百分比为 0.1%~1% ，氧化钛占所述发光 - 反射层的质量百分比为 0.1%~1% 。
7 、根据权利要求 1~5 中任一项所述的波长转换装置，其特征在于，所述粘接剂占所述发光 - 反射层的质量百分比为 40%~80% 。
8 、根据权利要求 7 所述的波长转换装置，其特征在于，所述粘接剂占所述发光 - 反射层的质量百分比为 45%~65% 。
9 、根据权利要求 7 所述的波长转换装置，其特征在于，所述粘接剂为玻璃介质，玻璃介质为连续玻璃介质，该玻璃介质 为 SiO2-B2O3-RO 、 SiO2-TiO2-Nb2O5-R' 2O 、 ZnO-P2O5 中的一种或多种，其中 R 为 Mg 、 Ca 、 Sr 、 Ba 、 Na 、 K 中的一种或多种， R' 为 Li 、 Na 、 K 中的一种或多种。
10 、根据权利要求 7 所述的波长转换装置，其特征在于，所述粘接剂为硅胶或硅树脂。
11 、根据权利要求 1~5 中任一项所述的波长转换装置，其特征在于，还包括位于所述发光 - 反射层一侧表面的基板，该基板为陶瓷基板、金属基板或陶瓷与金属的复合基板。
12 、根据权利要求 11 所述的波长转换装置，其特征在于，还包括位于所述基板和所述发光 - 反射层之间的纯反射层，该纯反射层包含氧化铝、氧化钛和粘接剂。
13 、一种荧光色轮，包括权利要求 1~12 中任一项所述的波长转换装置，所述波长转换装置的发光 - 反射层呈圆环形或扇环形分布。
14 、一种发光装置，包括权利要求 1~12 中任一项所述的波长转换装置，还包括一激发光源，该激发光源为固态光源。
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