Polymer/Carbon Quantum Dots Composite EL Devices and Tunable Spectra Mechanism

LIU Ze-ming; XU Jian-ping; LI Lin-lin; ZHANG Xu-guang; DONG Xiao-fei; REN Peng-fei; LI Lan

doi:10.3788/fgxb20163707.0823

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Polymer/Carbon Quantum Dots Composite EL Devices and Tunable Spectra Mechanism

更新时间：2020-08-12

- Polymer/Carbon Quantum Dots Composite EL Devices and Tunable Spectra Mechanism
- Chinese Journal of Luminescence Vol. 37, Issue 7, Pages: 823-828(2016)
- 作者机构：
  
  天津理工大学材料物理研究所光电器件与显示材料教育部重点实验室, 天津市光电显示材料与器件重点实验室天津,300384
- 作者简介：
- 基金信息：
  
  "863"
- DOI：10.3788/fgxb20163707.0823
  CLC： TP394.1;TN383+.1
- Received：25 February 2016，
  
  Revised：29 March 2016，
  
  Published：05 July 2016
- 稿件说明：
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刘泽明, 徐建萍, 李霖霖等. 聚合物/碳量子点复合EL器件及光谱移动机理[J]. 发光学报, 2016,37(7): 823-828

LIU Ze-ming, XU Jian-ping, LI Lin-lin etc. Polymer/Carbon Quantum Dots Composite EL Devices and Tunable Spectra Mechanism[J]. Chinese Journal of Luminescence, 2016,37(7): 823-828
刘泽明, 徐建萍, 李霖霖等. 聚合物/碳量子点复合EL器件及光谱移动机理[J]. 发光学报, 2016,37(7): 823-828 DOI： 10.3788/fgxb20163707.0823.

LIU Ze-ming, XU Jian-ping, LI Lin-lin etc. Polymer/Carbon Quantum Dots Composite EL Devices and Tunable Spectra Mechanism[J]. Chinese Journal of Luminescence, 2016,37(7): 823-828 DOI： 10.3788/fgxb20163707.0823.

摘要

制备了结构为ITO/PEDOT:PSS/polyvinylcarbazole (PVK)/carbon quantum dots(CDs)/LiF/Al的电致发光器件。器件的发光光谱显示:在电压从7 V增大到13 V的过程中

光谱峰值从380 nm移动到520 nm

色坐标由(0.20

0.20)移动到(0.29

0.35)。经与PL光谱对比认为

EL光谱包含了PVK与碳量子点的双重贡献

随着电压的增大

碳量子点的发射逐渐增强

PVK发光先增强后减弱。结合器件能级结构讨论了器件的发光机制

认为低电场下的PVK兼具发光层和电子阻挡层的功能

EL光谱为PVK层和碳量子点的发光叠加;随着电场强度的增大

碳量子点和PVK界面区的空间电荷阻止了电子向PVK的传输

光谱转变为由碳量子点和激基复合物的共同贡献。

Abstract

The electroluminescent devices with the structure of ITO/PEDOT:PSS/polyvinylcarbazole (PVK)/carbon quantum dots(CDs)/LiF/Al were fabricated. When the voltage raises from 7 V to 13 V

the voltage-dependent EL spectra can be observed to shift from 380 nm to 520 nm

and the color coordinates shift from (0.20

0.20) to (0.29

0.35). The device operating mechanism is investigated based on PL spectra of PVK and CDs and device energy-level diagram. PVK layer is considered to be responsible for electron blocking and meanwhile the emission in low electric field. The EL spectra are proposed to be the overlapping of PVK and CDs and their interface. With the voltage increase

the emission intensity of CDs displays enhancement but the converse trend is observed for PVK. Under high field

electroplex emission at PVK/CDs interface is known to contributed to whole EL spectra combining with CDs emission.

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Keywords

references

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