新穎Ce3+與Eu2+稀土離子激活鈧矽酸鹽螢光體 之製備發光特性鑑定與應用

Synthesis and Luminescence Study of Novel Ce3+- and Eu2+- Activated Scandium Silicate Phosphors for White-Light LEDs

李承翰(Chen-Han Lee)

指導教授 ： 陳登銘

國立交通大學/理學院/應用化學系所/碩士(2013年)

https://doi.org/10.6842/NCTU.2013.00495

摘要

本論文利用溶膠-凝膠合成法製備NaBaScSi2O7、KSrScSi2O7、Na3ScSi2O7與K3ScSi2O7等鈧矽酸鹽主體，分別摻入Eu2+或Ce3+作為活化劑離子，並且利用X光粉末繞射儀、螢光光譜儀、掃描式電子顯微鏡儀、紫外-可見光光譜儀、熱消光、量子效率與色度座標量測以進行螢光體之結構、發光特性及色度學特性分析鑑定，試圖開發新穎且可應用於白光LED的螢光材料。
　　本論文第一部分探討不同鈧矽酸鹽主體之最佳製備條件、X光粉末繞射晶相之分析鑑定與鈧矽酸鹽主體之SEM表面影像。第二部分則探討Eu2+所摻雜鈧矽酸鹽主體之發光特性與漫反射光譜，並研究新穎螢光體之熱消光效應。第三部分則研究Ce3+所摻雜鈧矽酸鹽主體之發光特性、漫反射光譜與熱消光效應，並針對溫度與發光強度與波長偏移之關聯進行探討。第四部分則探討以KSrScSi2O7:Eu2+藍色螢光粉、綠光Ba2SiO4:Eu2+商品與紅光Sr2Si5N8:Eu2+商品且搭配365 nm波長 UV晶片所封裝成的白光LED之發光特性、演色性與色溫。

關鍵字

螢光粉 ； 發光二極體 ； 鈰離子摻雜鈧矽酸鹽 ； 銪離子摻雜鈧矽酸鹽

並列摘要

In this study, we have successfully synthesized several novel phosphors with compositions of NaBaScSi2O7:R, KSrScSi2O7:R, Na3ScSi2O7:R (R = Ce3+ or Eu2+) and K3ScSi2O7:Ce3+ by using sol-gel method. The crystal structure, luminescence and chromaticity properties of the above phosphors were characterized by X-ray diffraction (XRD), photoluminescence spectra, scanning electron microscope, diffuse reflectance spectroscopy (DR) and
thermal luminescence quenching investigations.
The first part of this thesis reports the optimization of synthetic conditions for all novel silicate phosphors, analysis of XRD profiles, cell refinement and SEM images. Secondly, the spectroscopic property, diffuse reflectance spectra and thermal quenching behaviors of the Eu2+-doped phosphors were investigated. Third, the luminescence property, diffuse reflectance spectroscopy and thermal quenching behaviors of the Ce3+-activated silicate phosphors have also been investigated. Finally, we investigated the luminescence property, color rendering and chromaticity of a white LED by using Eu2+-doped KSrScSi2O7 phosphors with green Ba2SiO4:Eu2+and red Sr2Si5N8:Eu2+ and pumped using a 365 nm UV-chip.

並列關鍵字

Phosphor ； LED

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