Eu2+ → Tb3+ → Eu3+ energy transfer in Ca6La2Na2(PO4)6F2:Eu, Tb phosphors
Eu2+ → Tb3+ → Eu3+ energy transfer in Ca6La2Na2(PO4)6F2:Eu, Tb phosphors
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DOI：
10.1039/c6ra03154d
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发表时间：
2016-04
期刊：
影响因子：
3.9
通讯作者：
Mubiao Xie;Guo-xian Zhu;Dongyu Li;Rongkai Pan;Xionghui Fu
中科院分区：
文献类型：
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作者：
Mubiao Xie;Guo-xian Zhu;Dongyu Li;Rongkai Pan;Xionghui Fu
在CO还原气氛下，采用固相反应法制备了新型荧光粉Ca 6La 2Na 2（PO 4）6 F2：0.10Eu2+/Eu 3+，xTb 3+（x = 0，0.05，0.10，0.20，0.30，0.40，0.50）。Ca_6La_2Na_2（PO_4）_6F_2：xEu ~（2+）的荧光光谱表明，在基质中仍有少量的Eu ~（3+）存在。通过荧光粉的激发光谱、发射光谱和荧光衰减，详细讨论了Ca 6La 2Na 2（PO 4）6 F2：0.10Eu2+/Eu 3+，xTb 3+的Eu 2 + → Tb 3 + → Eu 3+能量传递过程。由于Eu ~（2+）的敏化作用，Ca_6La_2Na_2（PO_4）_6F_2：0.10Eu ~（2+）/Eu ~（3+），xTb ~（3+）在近紫外光激发下的相对发光强度增强。此外，可以通过改变Tb 3+掺杂浓度来获得具有大色域的可调谐发射。这些结果表明，Ca 6La 2Na 2（PO 4）6 F2：Eu 2 +/Eu 3+，Tb 3+荧光粉在n-UV芯片泵浦的白色LED器件中具有潜在的应用前景。
Novel phosphors Ca6La2Na2(PO4)6F2:0.10Eu2+/Eu3+, xTb3+ (x = 0, 0.05, 0.10, 0.20, 0.30, 0.40, 0.50) were prepared by a solid state reaction in a CO-reducing atmosphere. The fluorescence spectra of samples Ca6La2Na2(PO4)6F2:xEu2+ reveal that still a small number of Eu3+ ions are detected in the host. The Eu2+ → Tb3+ → Eu3+ energy transfer process in Ca6La2Na2(PO4)6F2:0.10Eu2+/Eu3+, xTb3+ phosphors was discussed in detail through the excitation, emission spectra and the fluorescence decay. As a result of Eu2+ sensitization, the relative emission intensity of Ca6La2Na2(PO4)6F2:0.10Eu2+/Eu3+, xTb3+ is enhanced under near-ultraviolet light excitation. Furthermore, tunable emission with a large color gamut can be obtained by changing the Tb3+ doping concentration. These results indicate that the Ca6La2Na2(PO4)6F2:Eu2+/Eu3+, Tb3+ phosphors will have potential use in n-UV chip pumped white LED devices.