以固態鋁源合成釔鋁石榴石螢光粉及其特性之研究

The Synthesis and Characterization of Yttrium Aluminum Garnet Phosphors Prepared with Different Aluminum Sources

黃乾祐(Chian-You Huang)

指導教授 ： 徐永富 ； 王錫福

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2006年)

https://doi.org/10.6841/NTUT.2006.00104

摘要

釔鋁石榴石攙鈰（yttrium aluminum garnet, YAG:Ce）螢光粉係屬藍光LED激發之白光LED用螢光粉，由於具有良好的熱穩定性及光轉換效率，是目前製作白光LED最常用的材料。
本研究係以α相氧化鋁、θ相氧化鋁及水鋁礦三種固態氧化物以及硝酸鋁作為鋁源，與硝酸釔及硝酸鈰等起始原料合成YAG:Ce螢光粉，藉由化學沉澱法使用正滴定、逆滴定及快速加入來達到低溫合成的效果。以化學沉澱法使用硝酸鋁為鋁源，採用正滴定及逆滴定皆可於900℃/2h得到純YAG相。而在固態鋁源方面，以逆滴定可得到最佳的混合均勻性，在以α相氧化鋁為鋁源製備前驅物經1500℃/24h之二階段煆燒可得纯YAG相；θ相氧化鋁於1400℃/24h便可得到純YAG相，而經PL檢測其最強發射峰分別為524及527 nm，介於黃綠光範圍。

關鍵字

純YAG相螢光粉 ； 混合均勻性 ； 相對發光強度 ； 固態鋁源

並列摘要

Ce3+-doped yttrium aluminum garnet (YAG:Ce) phosphor was synthesized by three different precipitation processes, in which aluminum nitrate, alumina (α and θ phase) or boehmite was used as the aluminum sorce. Pure YAG:Ce phosphor can be obtained from aluminum nitrate by normal strike and reverse strike precipitation method and calcined at 900℃ for 2h, which is shorter than that of fast titration method calcined at 900℃ for 4h.
When alumina (α and θ phase) or boehmite was used as the aluminum sorce. YAG phosphor can synthesized using θ-phase alumina by reverse strike precipitation and calcined at 1300℃/16h-1400/24h, which was 100℃ lower than that of used α-phase alumina. The spectra shows that YAG phosphors emitted at 524 and 527 nm, which was in the wavelength range of yellow to green light.

並列關鍵字

YAG phosphor ； precipitation process ； aluminum source

參考文獻

[14] I. Matsubara, M. Paranthaman, S.W. Allison, M. R. Cates, D.L. Beshears and D.E. Holcomb, “Preparation of Cr-doped Y3Al5O12 phosphors by heterogeneous precipitation methods and their luminescent properties,” Material Research Bulletin, vol. 35, no. 2, 2000, pp. 217-224.

[15] Jun-Ho Yum, Seok-Soon Kim, Yung-Eun Sung “Y3Al5O12:Ce0.05 phosphor coating on a flexible substrate for use in white light-emitting diodes ,“ Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 251, no. 1-3, 2004, pp. 203-207.

[17] Philip M. Jaffe, “Fluorescence and phosphorescence,” IEEE transactions on component parts, Vol.11, no. 3, 1964, pp. 3-7.

[18] Hui-Ling Wen and Fu-Su Yen, “Growth characteristics of boehmite-derived ultra fine theta and alpha-alumina particles during phase transformation,” Journal of Crystal Growth, vol. 208, no. 1-4, 2000, pp. 696-708.

[21] Harris, J. H. “Sintered aluminum nitride ceramics for high-power electronic applications ,“ JOM, June 1998, pp. 56.