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无机材料学报

无机材料学报 ›› 2023, Vol. 38 ›› Issue (9): 1062-1068.DOI: 10.15541/jim20230022

所属专题： 【能源环境】量子点(202309)； 【能源环境】钙钛矿(202310)

• 研究论文 • 上一篇    下一篇

钙钛矿多色级联发光二极管中多中心载流子均衡分布调控研究

王润(), 相恒阳(), 曾海波()   

  1. 南京理工大学 材料科学与工程学院, 新型显示材料与器件工信部重点实验室, 南京 210094
  • 收稿日期:2023-01-12 修回日期:2023-03-16 出版日期:2023-09-20 网络出版日期:2023-04-11
  • 通讯作者: 相恒阳, 讲师. E-mail: xiang.hengyang@njust.edu.cn;
    曾海波, 教授. E-mail: zeng.haibo@njust.edu.cn
  • 作者简介:王 润(1993-), 女, 博士研究生. E-mail: wangrun@njust.edu.cn
  • 基金资助:
    中央高校基本科研业务费专项资金(30920041117);中央高校基本科研业务费专项资金(30921011106);国家自然科学基金(62004101);国家自然科学基金(52131304);国家重点研发计划(2022YFB3606502)

Carrier Balanced Distribution Regulation of Multi-emissive Centers in Tandem PeLEDs

WANG Run(), XIANG Hengyang(), ZENG Haibo()   

  1. MIIT Key Laboratory of Advanced Display Materials and Devices, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2023-01-12 Revised:2023-03-16 Published:2023-09-20 Online:2023-04-11
  • Contact: XIANG Hengyang, lecturer, E-mail: xiang.hengyang@njust.edu.cn;
    ZENG Haibo, professor. E-mail: zeng.haibo@njust.edu.cn
  • About author:WANG Run (1993-), female, PhD candidate. E-mail: wangrun@njust.edu.cn
  • Supported by:
    Fundamental Research Funds for Central Universities(30920041117);Fundamental Research Funds for Central Universities(30921011106);National Natural Science Foundation of China(62004101);National Natural Science Foundation of China(52131304);National Key Research and Development Program of China(2022YFB3606502)

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摘要：

钙钛矿发光二极管(PeLEDs)具有优异的光电特性, 在显示应用中表现出巨大的发展潜力。红、绿和蓝单色PeLEDs的研究已经取得了突破性的进展, 但是三色钙钛矿共同电致发光的研究始终迟滞不前。本研究在不同钙钛矿之间引入具有空穴/电子产生和传输能力的中间连接层(ICL), 实现了蓝绿双色和红绿蓝三色发光中心共同电致发光。一方面, ICL可以抑制不同钙钛矿之间的离子交换和能量转移; 另一方面, ICL具有电荷产生和输运功能, 能够确保不同发光中心获得足够的载流子实现独立发光。进一步改变空穴传输层(NPB)的厚度可以调控蓝绿双色发光中心之间的能量均衡分布, 当NPB厚度为40 nm时，器件表现出最大外量子效率(External Quantum Efficiency, EQE)为0.33%。红绿蓝钙钛矿共同电致发光器件的最大EQE达到0.5%。本工作首次报道了红绿蓝三色钙钛矿共同电致发光, 并为钙钛矿多色发光中心共同电致发光提供了具有参考性的策略, 推动了钙钛矿在显示应用中的发展进程。

关键词: 钙钛矿发光二极管, 多色发光中心, 中间连接层, 载流子分布调控

Abstract:

Perovskite light-emitting diodes (PeLEDs), owing to their unique photoelectric performance, show promising prospects in display applications. Red, green, and blue monochromatic PeLEDs have achieved remarkable breakthroughs, but the study of red/green/blue perovskite co-electroluminescence is still delayed. This study proposed a strategy that an intermediate connection layer (ICL) with hole/electron generation and transport capability is introduced between perovskites. On the one hand, introduction of the ICL can inhibit ion exchange and energy transfer. On the other hand, ICL has a charge-generation function that ensures different perovskite centers capture enough carriers. Furthermore, the thickness of the hole transport layer (NPB) is optimized. Furthermore, the thickness of the hole transport layer (NPB) is regulated, the blue/green tandem PeLED achieved relatively balanced luminescence and exhibits the largest EQE of 0.33%. The developed red/green/blue tandem PeLED exhibits the highest EQE of 0.5%, which is the first report in the field of PeLEDs, and exhibits the largest External Quantum Efficiency(EQE) of 0.33%. The developed red/green/blue tandem PeLED exhibits the highest EQE of 0.5%. In conclusion, this work provides a reference strategy for the co-electroluminescence of multicolor perovskites, which is expected to promote the development of perovskite in display applications.

Key words: perovskite light-emitting diodes, multicolor emission centers, intermediate connection layer, carrier distribution regulation

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