Single phase white LED phosphor Ca3YAl3B4O15:Ce3+,Tb3+,Sm3+ with superior performance: Color-tunable and energy transfer study
Single phase white LED phosphor Ca3YAl3B4O15:Ce3+,Tb3+,Sm3+ with superior performance: Color-tunable and energy transfer study
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单相白光LED荧光粉Ca3YAl3B4O15:Ce3,Tb3,Sm3具有优越的性能：颜色可调和能量转移研究
DOI：
10.1016/j.cej.2021.128455
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发表时间：
2021-01-18
影响因子：
15.1
通讯作者：
Wu, Mingmei
中科院分区：
文献类型：
--
作者：
Khan, Wasim Ullah;Zhou, Lei;Wu, Mingmei
白色发光二极管作为下一代的光引发剂，正成为一个不断发展和吸引人的研究领域。然而，弱的热稳定性，高相关色温（CCT），和低显色性（Ra）限制了其大规模实施的有效性。在本工作中，我们首次报道了稀土离子Ce ~（3+）-Tb ~（3+）-Sm ~（3+）掺杂到Ca_3YAl_3B_4O_（15）（CYAB）中制备WLED，其表现出可调的光致发光特性，分别实现了优异的热稳定性、单相白色光发射以及Ce ~（3+）、Tb ~（3+）、Sm ~（3+）离子之间的有效能量传递。对阳离子硼酸盐CYAB荧光粉的晶体结构和稀土离子掺杂进行了定量评价，结果表明，稀土离子掺杂的荧光粉优先选择9配位的Y位。分别通过光致发光、寿命曲线和量子效率研究了敏化效果。此外，CY（0.45）AB：0.50Tb（3+），0.05Sm（3+）和CY（0.65）AB：0.03Ce（3+），0.20Tb（3+），0.12Sm（3+）荧光粉对热猝灭现象具有显著的抵抗能力。无论是含有CY（0.45）AB：0.50 Tb（3+），0.05 Sm（3+）荧光粉与市售蓝色荧光粉混合的白色LED，还是只含有CY（0.65）AB：0.03 Ce（3+），0.20 Tb（3+），0.12 Sm（3+）荧光粉的单相WLED，都表现出暖白色发光，其低CCT分别接近4543 K或3913 K，高Ra分别为86.0或84.4。这些结果上级优于商业WLED含有Y3 Al 5 O 12：Ce 3+荧光粉和蓝光LED芯片（CCT约为7746 K，Ra约为75），这为WLED的制造提供了良好的候选者。
The white light-emitting diodes, contributing as a light initiator for the succeeding generation, is now becoming a consistently developing and attractive research area. However, the weak thermal stability, high correlated color temperature (CCT), and low color rendering (Ra) restrict its effectiveness for large-scale implementation. In this work, we reported for the first time the incorporation of rare-earth ions Ce3+-Tb3+-Sm3+ into Ca3YAl3B4O15 (CYAB) in the fabrication of WLEDs, which showed tunable photoluminescence properties to accomplish exceptional thermal stability, single-phase white light emission, and efficient energy transfer among Ce3+, Tb3+, Sm3+ ions, respectively. The crystal structure and the rare earth ion dopants in the cation borate CYAB phosphors were quantitatively evaluated, that highlighting the preferences at 9-fold-coordinated Y sites. The sensitization effects were studied by evaluating the photoluminescence, lifetime curves, and quantum efficiencies, respectively. Besides this, the CY(0.45)AB:0.50Tb(3+), 0.05Sm(3+) and CY(0.65)AB:0.03Ce(3+), 0.20Tb(3+), 0.12Sm(3+) phosphors possess significant resistance towards thermal quenching phenomena. The white LED either containing CY(0.45)AB:0.50Tb(3+), 0.05Sm(3+) phosphor blended with the commercial blue phosphor or the single-phase WLED only containing CY(0.65)AB: 0.03Ce(3+), 0.20Tb(3+), 0.12Sm(3+) phosphor exhibited warm white emissions either with low CCT approximate to 4543 K or 3913 K and high Ra with 86.0 or 84.4, respectively. These results are superior to the commercial WLED containing Y3Al5O12:Ce3+ phosphor and blue LED chip (CCT approximate to 7746 K, Ra approximate to 75), that furnish either as a good candidate for the fabrication of warm WLED.