Tunable white-light emission in single-phase Ca 9 Gd(VO 4 ) 7 :Tm 3+ , Eu 3+
Tunable white-light emission in single-phase Ca 9 Gd(VO 4 ) 7 :Tm 3+ , Eu 3+
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DOI：
10.1364/ome.4.000016
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发表时间：
2014
影响因子：
2.8
通讯作者：
Ling Li;H. Noh;B. Moon;J. Jeong;B. Choi;Xiaoguang Liu
中科院分区：
文献类型：
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作者：
Ling Li;H. Noh;B. Moon;J. Jeong;B. Choi;Xiaoguang Liu
采用固相反应法合成了一系列Tm3+和/或Eu3+掺杂Ca9Gd(VO4)7单一组分荧光粉，并研究了其发光性能。 Tm3+和Eu3+共掺杂Ca9Gd(VO4)7荧光粉在紫外激发下呈现出蓝色（在477 nm处有峰值）和红色（在620 nm处有更强的峰值）双发射带，这分别源于Tm3+和Eu3+离子的f-f跃迁。研究了从O2--V5+ CT（电荷转移）能量到Tm3+和Eu3+离子的能量转移以及从Tm3+到Eu3+离子的能量转移。通过调节Tm3+和Eu3+离子的浓度可以调节蓝色和红色发射的光致发光强度比，从而使发射颜色从蓝色到白色再到红色变化。 Ca9Gd(VO4)7:Tm3+、Eu3+单相荧光粉通过Tm3+发射和Eu3+发射相结合实现白光发射。
A series of Tm3+ and/or Eu3+ doped Ca9Gd(VO4)7 single composition phosphors were synthesized by a solid state reaction method, and their luminescence properties were investigated. Tm3+ and Eu3+ co-doped Ca9Gd(VO4)7 phosphors showed a blue with the peak at 477 nm and red with the stronger peak at 620 nm dual emission bands under the UV excitation, which originates from the f-f transitions of Tm3+ and Eu3+ ions, respectively. The energy transfer from O2--V5+ CT (charge transfer) energy to Tm3+ and Eu3+ ions as well as the energy transfer from Tm3+ to Eu3+ ions were investigated. The photoluminescence intensity ratio of blue and red emission could be tuned by adjusting the concentration of Tm3+ and Eu3+ ions and as a result the emission color varies from blue to white to red. The white-light emission is realized in single phased phosphor of Ca9Gd(VO4)7:Tm3+, Eu3+ by combining the Tm3+-emission and the Eu3+-emission.