Color-tunable emissions via energy transfer in Bi3+ and Eu3+ doped beta-LaB5O9: Sol-gel synthesis and photoluminescence
Color-tunable emissions via energy transfer in Bi3+ and Eu3+ doped beta-LaB5O9: Sol-gel synthesis and photoluminescence
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通过 Bi3 和 Eu3 掺杂 β-LaB5O9 中的能量转移实现颜色可调发射：溶胶-凝胶合成和光致发光
DOI：
10.1016/j.jlumin.2019.116880
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发表时间：
2020
影响因子：
3.6
通讯作者：
Yang Tao
中科院分区：
文献类型：
--
作者：
Yang Ruirui;Qi Yuxuan;Gao Yan;Jiang Pengfei;Cong Rihong;Yang Tao
据报道，五硼酸盐β-LaB5O9是稀土激活剂Ce3+、Eu3+、Tb3+、Sm3+和Dy3+的良好基质。本工作首次采用溶胶凝胶法将Bi3+掺杂到五硼酸盐结构的β-LaB5O9中，通过对粉末X射线衍射数据的分析，确定了Bi3+的掺杂上限为17个原子%。Bi3+在440 nm处有一个很强的发射带，在12个原子%处有轻微的浓度猝灭。在β-La0.9yBi0.1EuyB5O9(0.025 ≤y≤ 0.15)荧光粉中，随着Eu3+掺杂浓度的增加，发光强度和寿命迅速下降，证实了Bi3+向Eu3+的能量转移。从CIE坐标从(0.163，0.152)到(0.318，0.211)的演化可以看出，得益于能量转移，在紫外光激发下可以实现从蓝色到粉红色的颜色可调发射。
Pentaborate β-LaB5O9was reported to be a good phosphor host for rare earth activators, like Ce3+, Eu3+, Tb3+, Sm3+and Dy3+. Herein this work, Bi3+was incorporated into the pentaborate structure β-LaB5O9for the first time using the sol-gel method, and the doping upper limit is confirmed to be 17 atom% by careful analyses on the powder X-ray diffraction data. Bi3+exhibits an intense emission band with the maximum at 440 nm and it has a slight concentration quenching at 12 atom%. Bi3+to Eu3+energy transfer was confirmed in β-La0.9-yBi0.1EuyB5O9(0.025 ≤y≤ 0.15) phosphors according to the fast decreasing of the Bi3+emission in both intensity and lifetime along with the increase of Eu3+dopant concentration. Benefiting from the energy transfer, color-tunable emissions could be realized from blue to pink under UV excitation, indicated by the CIE coordinate evolution from (0.163, 0.152) to (0.318, 0.211).