Device performance and light characteristics stability of quantum-dot-based white-light-emitting diodes

作     者：Bruno Clasen Hames Ivan Mora-Sero Rafael S. Sanchez 

作者机构：Institute of Advanced Materials (INAM) Universitat Jaume 1 12071 Castello Spain 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2018年第11卷第3期

页      面：1575-1588页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080203[工学-机械设计及理论] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 

基　　金：supported by MINECO of Spain Generalitat Valenciana support of the National Council of Technological and Scientific Development (CNPq) Brazil, through the Science without Borders program 

主　　题：colloidal quantum dots quantum dotlight-emitting diodes white light-emitting diode(LED) displays electroluminescence LED stability 

摘      要：Advances in image quality in recent decades have made it necessary to develop new technologies for producing displays to meet remarkably stricter standards. The display market is governed mainly by liquid crystal display and light-emitting diode （LED） technology; however, it suffers from limitations that can be overcome by developing the next generation of electroluminescent displays. The introduction of colloidal quantum dots （QDs） as down-converters has enabled the production of displays with extremely high color purity and gamut. Therefore, colloidal nanocrystals are excellent candidates for the preparation of electroluminescent devices, which represent a straightforward approach to the development of unprecedented high-quality displays. We synthesized light-emitting QDs covering the entire visible spectrum with high fluorescence quantum yields and color purity, and produced high-brightness single-color LEDs with external quantum efficiencies of 0.39%, 1.04%, 2.10%, and 1.30% for red-, orange-, green-, and blue-emitting dots, respectively. Additional136 white LEDs were prepared by mixing QDs; they showed color temperatures of 5,300 K and color rendering indices exceeding 80%. Very importantly, we exhaustively characterized the LED performance, including the response time, stability, and evolution of the light characteristics, thus providing crucial information toward the development of high-quality electroluminescent displays.