白光LED用紅粉薄膜復合熒光玻璃的制備及性能研究
發(fā)布時間：2019-01-04 20:06
【摘要】：作為第四代照明光源,白光LED因節(jié)能環(huán)保、壽命長、使用電壓低、響應快等優(yōu)點,在室內外、特種照明領域受到廣泛應用。常見的商用白光LED是用硅膠或環(huán)氧樹脂包YAG:Ce3+熒光粉后直接涂覆在藍光InGaN芯片上制成的。然而,這種封裝方式存在三個問題:1)由于傳統(tǒng)有機封裝材料的熱導率太差,在長時間熱輻射的工作環(huán)境中容易老化、黃化,導致LED光衰、色坐標偏移,降低了其使用壽命;2) YAG:Ce3+熒光粉顆粒折射率與有機封裝材料折射率不匹配,同樣會導致光散射損失。3) YAG:Ce3+熒光粉發(fā)射光譜中紅光成分不足,封裝成的白光LED器件顯色指數(shù)偏低、色溫偏高使其難以得到暖白光。因而,具有熱導率高、結構穩(wěn)定、光輸出性能良好且兼有顯色指數(shù)、色溫可調等特性的新型光學材料正成為半導體照明技術研究的熱點。本課題開創(chuàng)了紅粉薄膜復合熒光玻璃的組合方式:即首先制備出熱/化學穩(wěn)定性良好、光學性能優(yōu)異的熒光玻璃(微晶玻璃),再采用絲網(wǎng)印刷的方式涂覆一層紅粉薄膜在熒光玻璃片上封裝成白光LED期間。這種復合方式既結合了玻璃優(yōu)良的導熱性能、較好的光透過性、物化性能穩(wěn)定等優(yōu)點,克服了傳統(tǒng)白光LED壽命短、折射率不匹配等缺點;又采用了絲網(wǎng)印刷法涂覆紅粉的方式實現(xiàn)了白光LED的色度可調。主要的研究內容如下:(1)在前期實驗的基礎上,采用一步低溫共燒結法首先制備了透明的LuAG:Ce3+熒光玻璃,再采用絲網(wǎng)印刷的方式涂覆1113相的CaAlSiN3:Eu2+封裝得到白光LED器件。首先制備的LuAG:Ce3+熒光玻璃利用XRD、SEM、熒光光譜等方式表征了樣品的物相、微觀結構及發(fā)光性能,并且熱穩(wěn)定性測試結果顯示LuAG:Ce3+在同等條件下熒光強度明顯高于硅膠封裝的LuAG:Ce3+,表明一步低溫共燒結法能很好的制備出導熱性能優(yōu)良、光透過性較好、物/化性能穩(wěn)定的熒光玻璃。切割成片的熒光玻璃片與藍光芯片復合封裝成LED器件,無論是改變摻雜的熒光粉濃度還是熒光玻璃片的厚度都很難獲得暖色調的白光。隨后,采用絲網(wǎng)印刷的方式將CaAlSiN3:Eu2+紅粉薄膜均勻的涂覆在切割成片的LuAG:Ce3+熒光玻璃襯底上,封裝成的LED器件色度隨紅粉含量的變化白光由冷白光到正白光后到暖百光區(qū)域移動,相應的光電參數(shù)色溫降低、顯指上升。且同等條件下,表面涂覆紅色熒光層的熒光玻璃其熒光強度與未涂覆比較只發(fā)生了微弱的變化,進一步表面這種復合紅粉薄膜和熒光玻璃方式可以應用用大功率LED室內照明。最后其封裝的器件的空間色度分布較差,未來有待進一步研究。(2)同樣,用一步低溫共燒結法首先制得透明的YAG:Ce3+,Ga3+ (YAGG)熒光玻璃,再利用絲網(wǎng)印刷的方式涂覆258相Ca2Si5Al8: Eu2+紅色粉薄膜YAGG襯底上封裝得到LED器件。制備的YAGG熒光玻璃同樣通過XRD、SEM、熒光光譜等方式表征了樣品的物相、微觀結構及發(fā)光性能,表明了 YAGG同LuAG:Ce3+一樣在該玻璃基質中保持了較好的物化、光學穩(wěn)定性。隨后,采用絲網(wǎng)印刷的方式將紅粉薄膜均勻的涂覆在切割成片的YAGG熒光玻璃。研究了不同紅粉濃度和涂覆厚度對于紅粉薄膜的光學、熱穩(wěn)定性從而找到最佳涂覆厚度,在最佳涂覆厚度上改變紅粉濃度使得封裝的LED器件色度由冷白光到正白光后到暖百光區(qū)域變化,相應的光電參數(shù)色溫降低、顯指上升。最后,我們對此封裝的LED器件進行了熱、濕穩(wěn)定性的測試研究,實驗結果顯示,經(jīng)過熱沖擊和長時間的濕侵蝕,熒光強度損失低(小;于于g%),顯指和色溫變化很小,充分表明了這種紅粉薄膜復合熒光玻璃材料具有良好的可靠性,可應用于大功率長時間的LED照明。
[Abstract]:As the fourth-generation illumination light source, the white light LED has the advantages of energy conservation, environmental protection, long service life, low use voltage, fast response and the like, and is widely applied in the field of indoor and outdoor and special illumination. The common commercial white light LED is made of silica gel or epoxy resin bag YAG: Ce3 + fluorescent powder and is directly coated on the blue-light InGaN chip. however, there are three problem in this encapsulation mode: 1) because that thermal conductivity of the conventional organic packaging material is too poor, it is easy to age and yellow in the working environment of long-time heat radiation, resulting in an LED light attenuation, a color coordinate shift, a reduced service life thereof, and 2) a YAG: and the refractive index of the Ce3 + fluorescent powder particles does not match the refractive index of the organic packaging material, and the light scattering loss is also caused. 3) the red light component in the YAG: Ce3 + fluorescent powder emission spectrum is not enough, the color rendering index of the packaged white light LED device is low, and the color temperature is high, so that the white light is difficult to obtain. therefore, the novel optical material with the characteristics of high thermal conductivity, stable structure, good light output performance and both color rendering index and color temperature adjustment is becoming a hot point for the research of the semiconductor lighting technology. The method for combining the red powder and the composite fluorescent glass comprises the following steps of: firstly, preparing a fluorescent glass (microcrystalline glass) with good thermal/ chemical stability and excellent optical property, and coating a layer of red powder film on the fluorescent glass sheet in a screen printing mode to form a white light LED. The composite mode not only combines the advantages of excellent heat conductivity of the glass, good light transmittance, stable physical and chemical property, and the like, overcomes the defects of short service life of the traditional white light LED, does not match the refractive index, and the like, and realizes the chromaticity adjustment of the white light LED by adopting a screen printing method to coat the red powder. The main research contents are as follows: (1) The transparent LuAG: Ce3 + fluorescent glass is prepared by one-step low-temperature co-sintering method on the basis of the earlier experiment, and the white light LED device is obtained by coating 1113-phase CaAlSiN3: Eu2 + in screen printing. The first prepared LuAG: Ce3 + fluorescent glass characterized the phase, microstructure and luminescence of the sample by means of XRD, SEM and fluorescence spectra, and the results of the thermal stability test show that the fluorescence intensity of the LuAG: Ce3 + under the same conditions is obviously higher than that of the LuAG: Ce3 + of the silica gel package. It is shown that the one-step low-temperature co-sintering method can produce the fluorescent glass with excellent thermal conductivity, good light transmittance and stable object/ chemical property. the fluorescent glass sheet and the blue-light chip which are cut into pieces are combined and packaged into an LED device, so that the white light of the warm color is difficult to be obtained by changing the concentration of the doped fluorescent powder or the thickness of the fluorescent glass sheet. then, the CaAlSiN3: Eu2 + red powder film is uniformly coated on a sheet-shaped LuAG: Ce3 + fluorescent glass substrate in a screen-printing manner, and the chromaticity of the packaged LED device changes with the change of the red powder content from the cold white light to the warm white light area, the color temperature of the corresponding photoelectric parameter is reduced, and the color temperature of the corresponding photoelectric parameter is raised. and under the same conditions, the fluorescence intensity of the fluorescent glass with the red fluorescent layer coated on the surface is slightly changed compared with the uncoated comparison, and the further surface of the composite red powder film and the fluorescent glass can be used for lighting in a high-power LED. Finally, the space chromaticity distribution of the packaged device is poor, and the future is to be further studied. (2) in the same way, the transparent YAG: Ce3 +, Ga3 + (YAGG) fluorescent glass is first prepared by one-step low-temperature co-sintering method, and the 258-phase Ca2Si5Al8: Eu2 + red powder film YAGG substrate is coated on the YAGG substrate by screen printing to obtain the LED device. The prepared YAGG fluorescent glass is also characterized by XRD, SEM and fluorescence spectra, and shows that YAGG has better physical and chemical and optical stability in the glass matrix, like LuAG: Ce3 +. Subsequently, the red powder film was uniformly coated on a cut sheet of YAGG fluorescent glass in a screen-printing manner. the optical and thermal stability of the different red powder concentration and the coating thickness on the red powder film are studied so as to find the optimal coating thickness, change the concentration of the red powder on the optimal coating thickness so that the chromaticity of the packaged led device is changed from the cold white light to the warm white light after the white white light to the white white light, the color temperature of the corresponding photoelectric parameter is reduced, and the color temperature of the corresponding photoelectric parameter is raised. In the end, we tested the heat and wet stability of the LED device in this package, and the results show that the fluorescence intensity loss is low (small; in g%) after thermal shock and long-time wet erosion, and the change of color temperature and color temperature is small. The red-powder thin-film composite fluorescent glass material has good reliability and can be applied to high-power long-time LED illumination.
【學位授予單位】：溫州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ171.1
本文編號：2400732
[Abstract]:As the fourth-generation illumination light source, the white light LED has the advantages of energy conservation, environmental protection, long service life, low use voltage, fast response and the like, and is widely applied in the field of indoor and outdoor and special illumination. The common commercial white light LED is made of silica gel or epoxy resin bag YAG: Ce3 + fluorescent powder and is directly coated on the blue-light InGaN chip. however, there are three problem in this encapsulation mode: 1) because that thermal conductivity of the conventional organic packaging material is too poor, it is easy to age and yellow in the working environment of long-time heat radiation, resulting in an LED light attenuation, a color coordinate shift, a reduced service life thereof, and 2) a YAG: and the refractive index of the Ce3 + fluorescent powder particles does not match the refractive index of the organic packaging material, and the light scattering loss is also caused. 3) the red light component in the YAG: Ce3 + fluorescent powder emission spectrum is not enough, the color rendering index of the packaged white light LED device is low, and the color temperature is high, so that the white light is difficult to obtain. therefore, the novel optical material with the characteristics of high thermal conductivity, stable structure, good light output performance and both color rendering index and color temperature adjustment is becoming a hot point for the research of the semiconductor lighting technology. The method for combining the red powder and the composite fluorescent glass comprises the following steps of: firstly, preparing a fluorescent glass (microcrystalline glass) with good thermal/ chemical stability and excellent optical property, and coating a layer of red powder film on the fluorescent glass sheet in a screen printing mode to form a white light LED. The composite mode not only combines the advantages of excellent heat conductivity of the glass, good light transmittance, stable physical and chemical property, and the like, overcomes the defects of short service life of the traditional white light LED, does not match the refractive index, and the like, and realizes the chromaticity adjustment of the white light LED by adopting a screen printing method to coat the red powder. The main research contents are as follows: (1) The transparent LuAG: Ce3 + fluorescent glass is prepared by one-step low-temperature co-sintering method on the basis of the earlier experiment, and the white light LED device is obtained by coating 1113-phase CaAlSiN3: Eu2 + in screen printing. The first prepared LuAG: Ce3 + fluorescent glass characterized the phase, microstructure and luminescence of the sample by means of XRD, SEM and fluorescence spectra, and the results of the thermal stability test show that the fluorescence intensity of the LuAG: Ce3 + under the same conditions is obviously higher than that of the LuAG: Ce3 + of the silica gel package. It is shown that the one-step low-temperature co-sintering method can produce the fluorescent glass with excellent thermal conductivity, good light transmittance and stable object/ chemical property. the fluorescent glass sheet and the blue-light chip which are cut into pieces are combined and packaged into an LED device, so that the white light of the warm color is difficult to be obtained by changing the concentration of the doped fluorescent powder or the thickness of the fluorescent glass sheet. then, the CaAlSiN3: Eu2 + red powder film is uniformly coated on a sheet-shaped LuAG: Ce3 + fluorescent glass substrate in a screen-printing manner, and the chromaticity of the packaged LED device changes with the change of the red powder content from the cold white light to the warm white light area, the color temperature of the corresponding photoelectric parameter is reduced, and the color temperature of the corresponding photoelectric parameter is raised. and under the same conditions, the fluorescence intensity of the fluorescent glass with the red fluorescent layer coated on the surface is slightly changed compared with the uncoated comparison, and the further surface of the composite red powder film and the fluorescent glass can be used for lighting in a high-power LED. Finally, the space chromaticity distribution of the packaged device is poor, and the future is to be further studied. (2) in the same way, the transparent YAG: Ce3 +, Ga3 + (YAGG) fluorescent glass is first prepared by one-step low-temperature co-sintering method, and the 258-phase Ca2Si5Al8: Eu2 + red powder film YAGG substrate is coated on the YAGG substrate by screen printing to obtain the LED device. The prepared YAGG fluorescent glass is also characterized by XRD, SEM and fluorescence spectra, and shows that YAGG has better physical and chemical and optical stability in the glass matrix, like LuAG: Ce3 +. Subsequently, the red powder film was uniformly coated on a cut sheet of YAGG fluorescent glass in a screen-printing manner. the optical and thermal stability of the different red powder concentration and the coating thickness on the red powder film are studied so as to find the optimal coating thickness, change the concentration of the red powder on the optimal coating thickness so that the chromaticity of the packaged led device is changed from the cold white light to the warm white light after the white white light to the white white light, the color temperature of the corresponding photoelectric parameter is reduced, and the color temperature of the corresponding photoelectric parameter is raised. In the end, we tested the heat and wet stability of the LED device in this package, and the results show that the fluorescence intensity loss is low (small; in g%) after thermal shock and long-time wet erosion, and the change of color temperature and color temperature is small. The red-powder thin-film composite fluorescent glass material has good reliability and can be applied to high-power long-time LED illumination.
【學位授予單位】：溫州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ171.1
【參考文獻】
相關期刊論文 前10條
1 林航;王波;王元生;;白光LED用熒光微晶玻璃設計制備、顯微結構與發(fā)光特性研究進展[J];應用化學;2016年10期
2 陳兆平;向衛(wèi)東;劉海濤;梁曉娟;鄒軍;;Ce,Sm共摻YAG單晶的生長及其光電性能的研究[J];人工晶體學報;2014年02期
3 張延;江悠;;SPS燒結制備新型熒光玻璃材料[J];玻璃與搪瓷;2013年06期
4 劉炳峰;向衛(wèi)東;劉海濤;張志敏;梁曉娟;陳兆平;趙斌宇;鐘家松;;白光LED用Ce,Re:YAG單晶的研究進展[J];硅酸鹽通報;2013年09期
5 劉炳峰;向衛(wèi)東;劉海濤;張志敏;梁曉娟;陳兆平;趙斌宇;;Ce,Tb:YAG單晶的生長及光譜性能[J];硅酸鹽學報;2013年09期
6 張志敏;梁曉娟;趙斌宇;陳兆平;劉炳峰;鐘家松;向衛(wèi)東;呂春燕;;Ce,Mn∶YAG單晶的生長及光學性能[J];高等學�；瘜W學報;2013年08期
7 華偉;向衛(wèi)東;董永軍;梁曉娟;楊帆;金懷東;梁續(xù);呂春燕;;白光LED用新型Eu或Gd共摻雜的Ce:YAG單晶熒光材料的光譜性能研究[J];稀有金屬材料與工程;2012年08期
8 陸神洲;楊秋紅;徐峰;王永剛;;基于Ce:YAG單晶的白光發(fā)光二極管性能研究[J];光學學報;2012年03期
9 華偉;向衛(wèi)東;董永軍;梁曉娟;楊帆;金懷東;梁續(xù);呂春燕;;白光LED用新型Ce,Pr摻雜的YAG單晶熒光材料的光譜性能研究[J];光子學報;2011年06期
10 劉云朋;靳孝峰;;LED結構及其封裝技術[J];焦作大學學報;2008年04期
，本文編號：2400732
本文鏈接：http://sikaile.net/kejilunwen/huaxuehuagong/2400732.html
最近更新
教材專著
