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液体双酸对全酸覆盖的液体双酸对高效的近红外矿量子点LED进行覆盖

Zong-Shuo Liu¹, Ye Wang¹, Feng Zhao¹

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, China.

Light, science & applications

|January 6, 2025

概括

我们开发了一种化学处理方法,使用Formamidine thiocyanate (FASCN) 来改善近红外 (NIR) LED. 这种方法提高了矿量子点 (PQD) 的稳定性和导电性,实现了创纪录的效率和低电压.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
光电学是指光电子产品.

背景情况:

矿量子点 (PQD) 对发光二极管 (LED) 是有前途的.
近红外 (NIR) PQD LED 由于表面连接体损失和离子迁移而遭受外部量子效率低下,从而产生火点.
这导致陷辅助重组和PQD设备的显著载体损失.

研究的目的:

开发一种化学处理策略,以消除PQD中的接口火点.
为了提高载体利用率和提高基于NIR PQD的LED的性能.
为了实现高性能NIR LED,具有更高的效率和更低的操作电压.

主要方法:

采用双酸盐和液体剂Formamidine thiocyanate (FASCN),用于PQD的化学处理.
使用FASCN处理来抑制带损失和界面火点的形成.
研究了FASCN处理的PQD薄膜的结合能量,导电性和被动化效应.

主要成果:

与油酸连体相比,FASCN处理的PQD薄膜的结合能量增加了四倍.
经过处理的薄膜表现出由于较短的配体,导电率增加了八倍.
基于PQD的NIR-LED在776nm实现了创纪录的低工作电压1.6V.
冠军的外部量子效率 (EQE) 达到约23%,使控制的效率翻了一番,并创下了基于PQD的NIR-LED的新纪录.

结论:

在PQD中,FASCN化学处理有效地使PQD的界面火点无能化.
增强的载体运输和利用可以显著提高NIR LED的性能.
该战略为基于PQD的高效,低压NIRLED设定了一个新的基准.

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