Enhanced photoluminescence and phosphorescence properties of red CaAlSiN3:Eu2+ phosphor via simultaneous UV-NIR stimulation
Enhanced photoluminescence and phosphorescence properties of red CaAlSiN3:Eu2+ phosphor via simultaneous UV-NIR stimulation
复制标题
通过同时 UV-NIR 刺激增强红色 CaAlSiN3:Eu2 荧光粉的光致发光和磷光特性
DOI：
10.1039/c5tc00236b
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发表时间：
2015-01-01
影响因子：
6.4
通讯作者：
Xiao, Yong
中科院分区：
文献类型：
--
作者：
Wang, Jin;Zhang, Haoran;Xiao, Yong
以氢化钙为钙源，采用固相反应法合成了不同掺杂量的CaAlSiN 3：Eu 2+红色荧光粉。CaAlSiN 3：Eu ~（2+）的持续发光是由于Eu ~（2+）离子在低浓度时，N位的O部分取代形成正陷阱能级而引入电子陷阱所致。宽的热释光发射带表明存在多个陷阱能级，其中浅陷阱能级主要负责红色持续发光;另外，深陷阱电子在额外近红外（980 nm）激发下可以有效释放，导致光致发光和磷光增强。紫外-近红外同时激发下的增强发射有望成为研究光学储能材料中陷阱分布的一种有前途的技术。
Red-emitting CaAlSiN3:Eu2+ phosphors with different doping contents have been synthesized by solid-state reaction using calcium hydride as a calcium source. The emergence of persistent luminescence in CaAlSiN3:Eu2+ was originated from electron traps introduced by the partial substitutions of O in N sites to form positive trap levels at low Eu2+ concentration. The broad thermoluminescence emission bands indicated multiple trap levels, in which the shallow traps were mainly responsible for the red persistent luminescence; besides, the deep trap electrons could be efficiently released under extra NIR (980 nm) stimulation, resulting in enhanced photoluminescence and phosphorescence. It is expected that the enhanced emission under UV-NIR simultaneous excitation may be a promising technique to investigate the trap distributions in optical energy storage materials.