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提高蓝色发射的外部量子效率Ba(K) -β-Al₂O₃:Eu²⁺由格子站点工程为全频谱照明

Chao Dou¹, Shengqiang Liu¹, Fangyi Zhao¹

¹The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Inorganic chemistry

|June 14, 2023

概括

格子站点工程显著提高了紫色可刺激的蓝色发射的外部量子效率 (EQE). 这一突破增强了转换白色发光二极管 (WLED) 的性能和色彩染.

科学领域:

材料科学材料科学材料科学
固态化学固态化学
光子学是一个光子学.

背景情况:

紫色可刺激的蓝色发光对于开发转换白色发光二极管 (WLED) 至关重要.
低的外部量子效率 (EQE) 限制了许多现有的蓝色发射的实际应用.
格子站点工程为克服这些局限性提供了一个潜在的策略.

研究的目的:

为了显著提高EQE的Eu²⁺-doped Ba(K) -β-Al₂O₃蓝色发射.
为了研究格子位置修改对发光性质的影响.
为先进的WLED应用开发高性能光剂.

主要方法:

合成Eu²⁺-doped Ba(K) -β-Al₂O₃体,其替代Ba²⁺的K⁺不同.
晶体结构的表征,发光特性 (PL强度,EQE) 和热稳定性.
使用优化光的WLED设备的制造和评估.

主要成果:

对Ba2+进行K+的部分替代导致了Eu2+协调多面体的收缩,并增加了晶体场的分裂.
激发光谱红移,与终端成员相比,PL强度提高了1.42倍.
最优的, (B_0.4K_1.6) _0.84AO:Eu,在400nm紫光激发下达到53%的EQE.
观察到优异的热稳定性,在150°C时保持95%的发光.
使用这种光素制造的WLED显示出超高的色彩染指数 (Ra = 95.5).

结论:

格子站点工程是一种有效的策略,可以增强蓝色发射的EQE和光谱特性.
开发的 (B_0.4K_1.6) _0.84AO:Eu体显示出用于高性能WLED应用的巨大潜力.
这项研究为设计具有量身定制的光谱特征的新型提供了宝贵的见解.

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