Preparation and properties of Prlus-plus">3+/Celus-plus">3+:YAG phosphors using triethanolamine as dispersant and pH regulator
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- 作者：SHIHONG TONG ; JUNYAN ZHAO ; XIU WEN
- 关键词：Co ; precipitation ; YAG powder ; phosphor ; white ; light LED ; ceramic.
- 刊名：Bulletin of Materials Science
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：39
- 期：6
- 页码：1515-1519
- 全文大小：792 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Engineering, general - 出版者：Springer India
- ISSN：0973-7669
- 卷排序：39
文摘
Pr3+/Ce3+:YAG precursors were co-precipitated using triethanolamine as dispersant and pH regulator. The different dosages of triethanolamine (D) vs. the properties of Pr3+/Ce3+:YAG phosphors were discussed. When D = 0.5 vol%, the pH of titration process was controlled in the range of ∼7.94–8.16 to guarantee the uniform distribution of Al, Y, Ce and Pr in the precursors. The relatively higher pH could decrease the loss of Ce and Pr in the precursors and increase the particle size of the obtained powders, which was beneficial to the enhancement of luminescent intensity. Therefore, the precursors directly converted to pure-phase YAG at 900°C, and the phosphors calcined at 1000°C showed the best dispersity due to the dispersion effect of triethanolamine and the most excellent luminescent property. When D≥ 2 vol%, although pure-phase YAG was detected, the emission intensity of the phosphors decreased due to the decrease of dispersity and purity. Moreover, the co-doped Pr3+ enhanced the red emission of Pr3+/Ce3+:YAG phosphors.