The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor
碩士 === 國立中山大學 === 光電工程學系研究所 === 101 === In this study, a sol-gel method is used to enhance the fluorescence intensity of the glass phosphor and reduce the problem of impurity diffusion inside the glass. Firstly, the Ce3+:YAG powder was coated with SiO2 nano thin film. The coated Ce3+:YAG powder was...
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ndltd-TW-101NSYS51240542015-10-13T22:40:48Z http://ndltd.ncl.edu.tw/handle/25009711560149519439 The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor 利用溶膠凝膠法披覆二氧化矽奈米薄膜於Ce3+:YAG螢光粉應用於玻璃螢光體之研究 Shi-sheng Hu 胡希聖 碩士 國立中山大學 光電工程學系研究所 101 In this study, a sol-gel method is used to enhance the fluorescence intensity of the glass phosphor and reduce the problem of impurity diffusion inside the glass. Firstly, the Ce3+:YAG powder was coated with SiO2 nano thin film. The coated Ce3+:YAG powder was mixed uniformly with low temperature glass powder and sintered at 700℃. The glass phosphor is named as sol-gel Ce3+:YAG doped glass (SGCeYDG). According to the Fresnel transmission theory, the transmittance of Ce3+:YAG powder coated with SiO2 nano film was 5% higher than Ce3+:YAG powder without coated. Owing to the total internal reflection angle increasing (33°→43°), the total internal reflection of fluorescence will be reduced. A intergrating sphere and a fluorescence spectrometer were employed to measure the quantum efficiency and fluorescence intensity of glass phosphor. In comparison with Ce3+:YAG doped glass (CeYDG) without coated SiO2, the quantum efficiency and fluorescence intensity of SGCeYDG was improved about 3.95% and 6.58%, respectively. To verify the micro-structure and composition of SiO2 film, SEM, EDS, FTIR and HRTEM were employed. Furthermore, high temperature accelerated aging test and damp heat test were used to compare the reliability between SGCeYDG, CeYDG and Ce3+:YAG doped silicone (CeYDS). In the reliability test parts, the high temperature accelerated aging test (HTAAT) and damp heat test (DHT) were used to compare the reliability between SGCeYDG, CeYDG and CeYDS. At the HTAAT-450℃, the CeYDS has been carbonized. The lumen loss of SGCeYDG and CeYDG were about 3% and 7%, respectively. The color drift of SGCeYDG and CeYDG were about 5.5×10-3 and 9.6%×10-3, respectively. On the other hand, After the DHT, The lumen loss of SGCeYDG, CeYDG and CeYDS were about 3.35%, 5.07% and 6.81%, respectively. The color shift of SGCeYDG, CeYDG and CeYDS were about 0.69×10-3, 1.31×10-3 and 6.81×10-3, respectively. The results of reliability test exhibited that the lumen loss and color drift of SGCeYDG were lower than CeYDG and CeYDS. Therefore, the SGCeYDG has the potential to apply to develop as the phosphor of high power white LED as its good heat-resistance and moisture-resistance. Wood-Hi Cheng 鄭木海 2013 學位論文 ; thesis 97 zh-TW |
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碩士 === 國立中山大學 === 光電工程學系研究所 === 101 === In this study, a sol-gel method is used to enhance the fluorescence intensity of the glass phosphor and reduce the problem of impurity diffusion inside the glass. Firstly, the Ce3+:YAG powder was coated with SiO2 nano thin film. The coated Ce3+:YAG powder was mixed uniformly with low temperature glass powder and sintered at 700℃. The glass phosphor is named as sol-gel Ce3+:YAG doped glass (SGCeYDG).
According to the Fresnel transmission theory, the transmittance of Ce3+:YAG powder coated with SiO2 nano film was 5% higher than Ce3+:YAG powder without coated. Owing to the total internal reflection angle increasing (33°→43°), the total internal reflection of fluorescence will be reduced. A intergrating sphere and a fluorescence spectrometer were employed to measure the quantum efficiency and fluorescence intensity of glass phosphor. In comparison with Ce3+:YAG doped glass (CeYDG) without coated SiO2, the quantum efficiency and fluorescence intensity of SGCeYDG was improved about 3.95% and 6.58%, respectively.
To verify the micro-structure and composition of SiO2 film, SEM, EDS, FTIR and HRTEM were employed. Furthermore, high temperature accelerated aging test and damp heat test were used to compare the reliability between SGCeYDG, CeYDG and Ce3+:YAG doped silicone (CeYDS). In the reliability test parts, the high temperature accelerated aging test (HTAAT) and damp heat test (DHT) were used to compare the reliability between SGCeYDG, CeYDG and CeYDS. At the HTAAT-450℃, the CeYDS has been carbonized. The lumen loss of SGCeYDG and CeYDG were about 3% and 7%, respectively. The color drift of SGCeYDG and CeYDG were about 5.5×10-3 and 9.6%×10-3, respectively. On the other hand, After the DHT, The lumen loss of SGCeYDG, CeYDG and CeYDS were about 3.35%, 5.07% and 6.81%, respectively. The color shift of SGCeYDG, CeYDG and CeYDS were about 0.69×10-3, 1.31×10-3 and 6.81×10-3, respectively. The results of reliability test exhibited that the lumen loss and color drift of SGCeYDG were lower than CeYDG and CeYDS. Therefore, the SGCeYDG has the potential to apply to develop as the phosphor of high power white LED as its good heat-resistance and moisture-resistance.
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author2 |
Wood-Hi Cheng |
author_facet |
Wood-Hi Cheng Shi-sheng Hu 胡希聖 |
author |
Shi-sheng Hu 胡希聖 |
spellingShingle |
Shi-sheng Hu 胡希聖 The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor |
author_sort |
Shi-sheng Hu |
title |
The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor |
title_short |
The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor |
title_full |
The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor |
title_fullStr |
The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor |
title_full_unstemmed |
The Study of Ce3+:YAG Phosphor Coating with SiO2 Nano Thin Film by Sol-Gel Processing in Application of Glass Phosphor |
title_sort |
study of ce3+:yag phosphor coating with sio2 nano thin film by sol-gel processing in application of glass phosphor |
publishDate |
2013 |
url |
http://ndltd.ncl.edu.tw/handle/25009711560149519439 |
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