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关于举行华侨大学 魏展画 教授学术报告的通知

时间:2018-10-11 09:38      发布人:huangjingbo      阅读:177

报告题目:高效多彩的钙钛矿发光二极管

报 告 人:魏展画 教 授 (华侨大学)

邀 请 人:叶轩立 教授

报告时间:2018年10月17日(周三) 上午 10:00

报告地点:北区发光材料与器件国重实验室 502室

欢迎广大师生参加!
报告摘要:

High Performance and Colorful Perovskite Light-emitting Diodes

Metal halide perovskite materials are an emerging class of solution-processed semiconductors with considerable potential for use in optoelectronic devices. For example, light-emitting diodes (LEDs) based on these materials could see application in flat-panel displays and solid-state lighting, owing to their potential to be made at low cost via facile solution processing, and could to provide tunable colors and narrow emission line widths at high photoluminescence quantum yields. However, the highest reported external quantum efficiencies of green- and red-light-emitting perovskite LEDs are around 14% and 12%, respectively—still well behind the performance of organic LEDs and inorganic quantum dot LEDs. Here we describe visible-light-emitting perovskite LEDs that surpass the quantum efficiency milestone of 20%. This achievement stems from a new strategy for managing the compositional distribution in the device—an approach that simultaneously provides high luminescence and balanced charge injection. Specifically, we mixed a presynthesized CsPbBr3 perovskite with a MABr additive (where MA is CH3NH3), the differing solubilities of which yield sequential crystallization into a CsPbBr3/MABr quasi-core/shell structure. The MABr shell passivates the nonradiative defects that would otherwise be present in CsPbBr3 crystals, boosting the photoluminescence quantum efficiency, while the MABr capping layer enables balanced charge injection. The resulting 20.3% external quantum efficiency represents a substantial step towards the practical application of perovskite LEDs in lighting and display( Wei, Z et al., Nature, DOI: 10.1038/s41586-018-0575-3).

Moreover, we will also introduce some research progress of other color emissive perovskite LEDs in our lab.

个人简介

魏展画,现任华侨大学材料科学与工程学院教授。2017年1月,入选泉州市引进高层次 创业创新人才名单。2011年本科毕业于厦门大学化学系。2011-2015年赴香港科技大学从事钙钛矿太阳电池以及染料敏化太阳电池的 研究,师从杨世和教授,并获博士学位。2015-2016年于南洋理工大学物理与应用物理系开展博士后研究工作,合作导师为Xiong Qihua教授。2016年回国后,任华侨大学材料科学与工程学院教授,研究方向主要为钙钛矿太阳能电池、钙钛矿发光二极管及其他光电器 件。针对目前钙钛 矿发光二极管器件效率较低,稳定性欠佳等关键问题,魏展画博士从组分调控,缺陷钝化,器件结构优化等角度对提高钙钛矿发光二极管外量子效 率进行探索,并首 次在国际上报道具有超过20%的外量子效率的绿光钙钛矿器件。魏展画教授取得一系列重要的研究成果,已发表学术论文30余篇,其中曾以第 一作者/共同一作 或通讯作者的身份在Nature, Energy & Environmental Science, Angewandte Chemie International Edition, Advanced Energy Materials, Nano Energy, Journal of Materials Chemistry A等国际知名科学杂志上发表文章。