Enhanced luminescence through interface energy transfer in hierarchical heterogeneous nanocomposites and application in white LEDs
Enhanced luminescence through interface energy transfer in hierarchical heterogeneous nanocomposites and application in white LEDs
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通过分层异质纳米复合材料中的界面能量转移增强发光及其在白光 LED 中的应用
DOI：
10.1016/j.jcis.2020.09.049
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发表时间：
2021
影响因子：
9.9
通讯作者：
Dingsheng Wang
中科院分区：
文献类型：
--
作者：
Guoyang Gao;Yini Li;Wenjing Yu;Guofeng Wang;Peifen Zhu;Weiping Qin;Dingsheng Wang
高效发光材料对于实现高性能器件至关重要。本文设计了一种新型复合体系以及增强的发光过程，其中由于NaLn(MoO4)2和In(OH)3之间成核率不同，NaLn(MoO4)2超小核可以被In(OH)3有效隔离，形成NaLn(MoO4)2@In(OH)3复合纳米团簇，然后这些小复合团簇逐渐自组装成分级结构。正如我们所预期的，通过插入In(OH)3来调节NaLn(MoO4)2超小核之间的距离，分级NaLn(MoO4)2纳米结构实现了增强的发光。一系列光谱结果表明，In(OH)3不仅充当CTB Eu3+→O2−(或MoO42−吸收)到Eu3+的能量传递桥梁，而且可以有效缓解Ln3+的浓度猝灭并改变J-O参数。 134 cm−1 处的拉曼峰有助于填充 Eu3+ 的 5D0 能级或 Er3+ 的激发态，从而产生更强的上/下转换发射。 NaLn(MoO4)2@In(OH)3 在白色发光二极管 (LED) 中的使用已得到证实。 NaLn(MoO4)2@In(OH)3 的红色发射与卤化物钙钛矿的蓝色、绿色和黄色发射相结合，可以获得具有出色视觉性能（LER 为 376 lm/W）和卓越色彩质量（CRI > 92）的白光。该实验结果为复合界面材料的设计提供了新的思路。
Highly efficient light-emitting materials are essential for achieving high-performance devices. Here, a novel composite system, as well as enhanced luminescence processes, was designed, where NaLn(MoO4)2ultra-small nucleus can be effectively isolated by In(OH)3to form NaLn(MoO4)2@In(OH)3composite nanoclusters due to the different nucleation rate between NaLn(MoO4)2and In(OH)3, and then these small composite clusters gradually self-assemble into hierarchical structures. As we expected, the enhanced luminescence was achieved from hierarchical NaLn(MoO4)2nanostructures with adjusting the distance among NaLn(MoO4)2ultra-small nucleus by inserting In(OH)3. A series of spectroscopy results show that the In(OH)3not only acts as an energy transfer bridge from CTB Eu3+→ O2−(or MoO42−absorption) to Eu3+, but also can effectively alleviate the concentration quenching of Ln3+and change the J-O parameters. The Raman peak at 134 cm−1is helpful to populate the5D0level of Eu3+or the excited states of Er3+, resulting in stronger up/down-conversion emissions. The use of NaLn(MoO4)2@In(OH)3in white light-emitting diodes (LEDs) has been demonstrated. The combination of red emission from NaLn(MoO4)2@In(OH)3with blue, green, and yellow emission from halide perovskites could achieve white light with excellent vision performance (an LER of 376 lm/W) and superior color quality (CRI > 92). The findings of this experiment provide a new idea for the design of composite interface materials.