Influence of synthetic temperature and heating time on the luminescence behavior of Mb>5b>(POb>4b>)b>3b>Cl:Eu²⁺,Mn²⁺ (M=Ca, Sr) phosphors

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• 作者：Fengli YANG ((杨凤丽))^a ; ^b ; ^c ; Wei AN ((安 炜))^d ; Hongyan LI ((李宏彦))^e ; Yunsheng HU ((胡运生))^a ; Huibing XU ((徐会兵))^a ; Xinyu YE ((叶信宇))^b ; Weidong ZHUANG ((庄卫东))^a ; ^{wdzhuang@126.com" class="auth_mail" title="E-mail the corresponding author} ; Xiping JING ((荆西平))^c ; ^{xpjing@pku.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：LED phosphors ; Eu2+-Mn2+ co-doping ; apatite ; synthetic temperature ; heating time ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：33
• 期：11
• 页码：1129-1136
• 全文大小：1531 K

文摘

To further understand the energy loss mechanism of the “charge transfer process” that was proposed in our previous work on Eu²⁺-Mn²⁺ co-doped phosphors, the influence of synthetic temperature and heating time on the photoluminescence (PL) behavior of Mb>5b>(POb>4b>)b>3b>Cl:Eu²⁺,Mn²⁺ (M=Ca, Sr) phosphors was investigated by analyzing their PL spectra and decay curves. For the Ca phase, an increase in the synthetic temperature resulted in an increase in the loss from the “charge transfer process” since more Eu²⁺ ions were involved in the Eu²⁺-Mn²⁺ clusters. This was contrary to the thermodynamic expectation. To solve this contradiction, we proposed that the formation of Eu²⁺-Mn²⁺ clusters was kinetically blocked at lower synthetic temperatures. With an increase in heating time for the phosphors synthesized at lower temperature (such as 1100 °C) the PL intensity decreased, which supported the above assertion.