混合量子点QLED结构性能研究

陈雯柏; 叶继兴; 马航; 李邓化

doi:10.3788/fgxb20173808.1076

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混合量子点QLED结构性能研究

器件制备及器件物理 | 更新时间：2020-08-12

- 混合量子点QLED结构性能研究
- Structural Properties of QLED Based on Hybrid Quantum Dots
- 发光学报 2017年38卷第8期页码：1076-1082
- 作者机构：
  
  1. 北京交通大学电子信息工程学院北京,100044
  2. 北京信息科技大学自动化学院北京,100101
- 作者简介：
- 基金信息：
  
  国家重点基础研究发展计划（973）（2015CB654605）资助项目()
- DOI：10.3788/fgxb20173808.1076
  中图分类号： TN383+.1
- 纸质出版日期：2017-8-5，
  
  收稿日期：2017-3-11，
  
  修回日期：2017-4-3，
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陈雯柏, 叶继兴, 马航等. 混合量子点QLED结构性能研究[J]. 发光学报, 2017,38(8): 1076-1082

CHEN Wen-bai, YE Ji-xing, MA Hang etc. Structural Properties of QLED Based on Hybrid Quantum Dots[J]. Chinese Journal of Luminescence, 2017,38(8): 1076-1082
陈雯柏, 叶继兴, 马航等. 混合量子点QLED结构性能研究[J]. 发光学报, 2017,38(8): 1076-1082 DOI： 10.3788/fgxb20173808.1076.

CHEN Wen-bai, YE Ji-xing, MA Hang etc. Structural Properties of QLED Based on Hybrid Quantum Dots[J]. Chinese Journal of Luminescence, 2017,38(8): 1076-1082 DOI： 10.3788/fgxb20173808.1076.

摘要

为研究基于混合量子点的QLED结构与性能，利用红光量子点以及绿光量子点两种材料制备了橙光QLED器件，并对其性能进行了表征。实验制备的器件结构为ITO/PEDOT：PSS/poly-TPD/混合QDs/ZnO/Al，其中发光层采用了3种混合量子点的混合结构方案。方案一先旋涂红光量子点层，后旋涂绿光量子点层；方案二先旋涂绿光量子点层，后旋涂红光量子点层；方案三将红光、绿光量子点1：1混合后制备为发光层。实验结果表明：方案一制备的器件电流密度最大，发光亮度最低，且只有红光谱；方案二制备的器件具有最小的电流密度，同时具有红、绿光谱，在8 V电压下，电流效率约为4.69 cd/A；方案三制备的器件同时具有红、绿光谱，电流密度与发光特性介于方案一与方案二之间。实测数据与理论分析是一致的，方案二制备的器件存在双能量陷阱，能够将注入的空穴以及电子同时限制在红光量子点层内。通过调节各功能层厚度使得载流子注入平衡，可进一步增大发光电流，提高器件效率。

Abstract

In order to study the structure and properties of QLED based on hybrid quantum dots

QLED devices were prepared using red light quantum dots and green light quantum dots as the light-emitting layer

and their properties were characterized. The structure of the device fabricated was ITO/PEDOT:PSS/poly-TPD/hybrid QDs/ZnO/Al

in which three kinds of hybrid quantum dot light-emitting layer were adopted. The red light quantum dot layer was spin coated firstly in the solution 1

followed with spin-coating green light quantum dot layer. The solution 2 first spin-coated green light quantum point layer

red quantum dot layer was spin-coated after that. In the solution 3

red and green quantum dots were mixed with the proportion of 1:1 and was then spin-coated as the light-emitting layer. The experimental results show that the device prepared by the solution 1 has the largest current density

lowest luminous intensity and only exhibit red light. The device prepared by the solution 2 has the minimum current density

and has the spectra of both red and green light. The maximum current efficiency is 4.69 cd/A at the external bias of 8 V. The device prepared by the solution 3 also exhibits red and green light

the current density and the luminous intensity are lower than that of the device prepared by the solution 2. It can be concluded from the energy level that the device prepared by the solution 2 has a double energy trap

therefore

it is advantageous in trapping both holes and electrons to the red light quantum dot layer. It is achievable to further improve the device efficiency by adjusting the thickness of each functional layer to balance the carrier injection.

关键词

量子点发光二极管双能量陷阱载流子注入平衡

Keywords

quantum dot light emitting diodedouble energy trapcarrier injection balance

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