Origin and Luminescence of Anomalous Red-Emitting Center in Rhombohedral Ba9Lu2Si6O24:Eu2+ Blue Phosphor
Origin and Luminescence of Anomalous Red-Emitting Center in Rhombohedral Ba9Lu2Si6O24:Eu2+ Blue Phosphor
复制标题
菱面体Ba9Lu2Si6O24:Eu2蓝色荧光粉中异常红光发射中心的起源和发光
DOI：
10.1021/acs.inorgchem.6b01196
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发表时间：
2016-09-05
影响因子：
4.6
通讯作者：
Jiang, Haochuan
中科院分区：
文献类型：
--
作者：
Liu, Yongfu;Zhang, Changhua;Jiang, Haochuan
我们得到了一种蓝色荧光粉Ba_9Lu_2Si_6O_（24）：Eu ~（2+）（BLS：Eu ~（2+）），它在460 nm处有一个强的发射峰，在460 ~ 750 nm处有一个弱的拖尾。在这种菱面体结构的材料中首次观察到了610 nm的红光发射，这与Ba 9 Sc2 Si 6 O24：Eu 2+和Ba 9 Y2 Si 6 O24：Eu 2+的相同晶体结构有很大的不同。从10到550 K的发光特性和衰减进行了讨论。新的红色发射来自于Eu 2+在Ba位点处具有更大配位数（12倍）的捕获激子态。它表现出异常的发光特性，具有宽的带宽和大的斯托克斯位移。在400 nm激发下，BLS：Eu ~（2+）的外量子效率为45.4%，高于商业蓝色荧光粉BAM：Eu ~（2+）的35.7%。如果能够提高BLS：Eu 2+的热稳定性，它将在高效近紫外白色LED中显示出良好的应用前景。
We obtain a blue phosphor, Ba9Lu2Si6O24:Eu2+ (BLS:Eu2+), which shows a strong emission peak at 460 nm and a weak tail from 460 to 750 nm. A 610 nm red emission is observed for the first time in this kind of rhombohedral structure material, which is much different from the same crystal structure of Ba9Sc2Si6O24:Eu2+ and Ba9Y2Si6O24:Eu2+. The luminescence properties and decays from 10 to 550 K are discussed. The new red emission arises from a trapped exciton state of Eu2+ at the Ba site with a larger coordination number (12-fold). It exhibits abnormal luminescence properties with a broad bandwidth and a large Stokes shift. Under the 400 nm excitation, the external quantum efficiency of BLS:Eu2+ is 45.4%, which is higher than the 35.7% for the commercial blue phosphor BAM:Eu2+. If the thermal stability of BLS:Eu2+ can be improved, it will show promising applications in efficient near-UV-based white LEDs.