QLEDs with Organic/Inorganic Hybrid Double Electron Transport Layers

CHEN Ya-wen; HUANG Hang; WEI Xiong-wei; LI Zhe; SONG Jing-yao; XIE Xiang-wei; FU Dong; CHEN

doi:10.3788/fgxb20183910.1439

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QLEDs with Organic/Inorganic Hybrid Double Electron Transport Layers

更新时间：2020-08-12

- QLEDs with Organic/Inorganic Hybrid Double Electron Transport Layers
- Chinese Journal of Luminescence Vol. 39, Issue 10, Pages: 1439-1444(2018)
- 作者机构：
  
  1. 中山大学化学学院,广东广州,510275
  2. 广东聚华印刷显示技术有限公司,广东广州,510663
  3. 深圳TCL工业研究院有限公司,广东深圳,518057
  4. 华南理工大学材料与科学学院,广东广州,510641
- 作者简介：
- 基金信息：
  
  Supported by National Research and Development Plan "Strategic Advanced Elect
- DOI：10.3788/fgxb20183910.1439
  CLC： TN383+.1
- Received：18 December 2017，
  
  Revised：04 March 2018，
  
  Published Online：24 April 2018，
  
  Published：05 October 2018
- 稿件说明：
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陈亚文, 黄航, 魏雄伟等. 有机/无机复合双层电子传输层的量子点发光二极管[J]. 发光学报, 2018,39(10): 1439-1444

CHEN Ya-wen, HUANG Hang, WEI Xiong-wei etc. QLEDs with Organic/Inorganic Hybrid Double Electron Transport Layers[J]. Chinese Journal of Luminescence, 2018,39(10): 1439-1444
陈亚文, 黄航, 魏雄伟等. 有机/无机复合双层电子传输层的量子点发光二极管[J]. 发光学报, 2018,39(10): 1439-1444 DOI： 10.3788/fgxb20183910.1439.

CHEN Ya-wen, HUANG Hang, WEI Xiong-wei etc. QLEDs with Organic/Inorganic Hybrid Double Electron Transport Layers[J]. Chinese Journal of Luminescence, 2018,39(10): 1439-1444 DOI： 10.3788/fgxb20183910.1439.

摘要

采用有机/无机复合双层电子传输层（ETL）研制绿色QLEDs，其中有机ETL采用OLED中常见的ETL材料，无机ETL采用ZnO纳米颗粒，并通过调控有机ETL厚度改变电子注入，使电子/空穴达到平衡。制备的器件结构为:ITO/PEDOT:PSS/TFB/QDs/ZnO NPs/TPBI:Liq/Al，其中有机电子传输层TPBI:Liq采用真空蒸镀沉积。与仅采用ZnO电子传输层的器件相比，可以使器件性能得到大幅提升:器件的最大电流效率从11.53 cd/A提升到22.77 cd/A，同时器件的启亮电压、电致发光光谱无明显变化。判断有机ETL的主要作用是抑制了过量电子的注入和传输，在发光亮度变化不大的情况下，降低了器件的无效复合（例如俄歇复合）电流，从而使电流效率明显提升。

Abstract

A unique ETL

composed of conventional organic materials used in OLED and ZnO nanoparticles(ZnO NPs) was adoped to improve the green-QLED device performance. The thickness of the organic ETL was adjusted to control the electron injection

therefore balance the electron/hole ratio. The device architecture of the green QLED fabricated in this work was ITO/PEDOT:PSS/TFB/QDs/ZnO NPs/TPBI:Liq/Al

in which the organic ETL was co-evaporated from TPBI and Liq. Compared with the device only having ZnO as the ETL

an additional organic ETL boosted the maximum current efficiency from 11.53 cd/A to 22.77 cd/A

without any significant impact on the turn-on voltage and the electroluminescence spectrum. We propose that the additional organic ETL has helped to suppress excess amounts of electrons being injected into the QD emissive layer

reducing the inefficient recombination (like Auger recombination) current without sacrificing much of the emission output

and eventually improved the device efficiency.

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Keywords

references

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