Green-emitting phosphor Na2Gd2B2O7:Ce3+, Tb3+ for near-UV LEDs
Green-emitting phosphor Na2Gd2B2O7:Ce3+, Tb3+ for near-UV LEDs
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用于近紫外 LED 的绿光荧光粉 Na2Gd2B2O7:Ce3、Tb3
DOI：
10.1039/c2ra00808d
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发表时间：
2012-01-01
期刊：
影响因子：
3.9
通讯作者：
Li, Ting
中科院分区：
文献类型：
--
作者：
Guo, Chongfeng;Jing, Heng;Li, Ting
基于Ce ~（3+）与Tb ~（3+）之间的高效能量传递，研制了Na_2Gd_2B_2O_7：Ce ~（3+），Tb ~（3+）绿色荧光粉。详细研究了其光致发光谱、激发光谱、寿命以及Tb ~（3+）浓度的影响。结果证实了从Ce 3+到Tb 3+的非辐射能量转移的发生，效率超过80%。Ce 3+的蓝光发射和Tb 3+的绿色发射的强度比可以通过调节它们的浓度来调节。Ce ~（3+）离子的4f-5d吸收峰在360 nm附近产生宽带激发峰，使Tb ~（3+）的光致发光得到增强，发射线尖锐。结果表明，最佳配比的Na 2Gd 2B 2 O 7：0.05Ce3+，0.12Tb3+荧光粉具有应用于近紫外发光二极管（n-UV LED）的潜力。
An intense green-emitting phosphor Na2Gd2B2O7:Ce3+, Tb3+ is developed on the basis of the highly efficient energy transfer from Ce3+ to Tb3+. The photoluminescence emission and excitation spectra, the lifetime, and the effect of Tb3+ concentration are investigated in detail. Results confirm the occurrence of non-radiative energy transfer from Ce3+ to Tb3+ with an efficiency of over 80%. The intensity ratio of blue emission from Ce3+ and green emission from Tb3+can be tuned by adjusting their concentrations. The enhanced photoluminescence of Tb3+ with sharp emission lines could be obtained by the broad band excitation peak at about 360 nm from the allowed 4f–5d absorption of Ce3+ ions. The results suggest that the phosphor Na2Gd2B2O7:0.05Ce3+, 0.12Tb3+ with the optimal composition could potentially be used for near ultraviolet light-emitting diodes (n-UV LEDs).