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明亮的热蒸发红色矿发光二极管通过现场缺陷被动化实现

Junhao Liu¹, Xiaorong Shi¹, Yajing Li¹

¹State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing 211816, Jiangsu, China.

The journal of physical chemistry letters

|September 3, 2025

概括

研究人员使用一种新的共蒸发方法开发出明亮的红色矿发光二极管 (PeLED). 这一突破提升了红色PeLED的性能,

科学领域:

材料科学
光电子产品
固态物理

背景情况:

热蒸发的矿发光二极管 (PeLED) 对大面积显示器具有优势,包括统一性和易于集成.
高亮度对于显示技术至关重要,但红色的PeLED性能在历史上落后于蓝色和绿色的同行.

研究的目的:

实现热蒸发红色PeLED的显著改善.
解决红色PeLED与其他颜色显示应用中的性能差距.

主要方法:

一个分子添加剂,2,8-bis ((diphenylphosphoryl) dibenzofuran (PPF) 的同蒸发,与PbI2和CsBr进行现场缺陷被动化.
使用第一原理计算来了解PPF在稳定 (Pb) 原子和补偿化物空缺中的机制.
薄膜特性 (晶度,均性) 和装置性能 (发光度,辐射波长) 的实验性表征.

主要成果:

通过稳定Pb外电子和补偿化物空位,PPF有效地消除了CsPbI2Br晶体中的缺陷.
加入PPF可以提高薄膜的晶度和均性,从而提高红色PeLED的发光效率.
在650nm时实现了热蒸发红色PeLED的记录亮度3789 cd m-2.

结论:

使用PPF的现场缺陷被动化策略在提高红色PeLED性能方面非常有效.
开发的红色PeLED符合Rec. 2020年红色排放标准,为高质量的显示应用铺平了道路.
这项工作是实现高亮度热蒸发红色PeLED的突破.

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