摘要
本文以Alq3:Liq为电子传输层,运用光电磁一体化测量技术,研究了电子传输层对有机电致发光器件磁效应的影响.在不同电压和不同温度下,测量了器件(ITO/MoO3/NPB/Alq3/Alq3:Liq/CsCl/Al)的电流强度和电致发光强度随外加磁场作用的变化,深入研究了不同电压以及不同掺杂厚度器件的磁电导效应(MC)和磁电致发光效应(MEL),并且探讨了低温下器件的磁效应机制.实验发现,不同掺杂厚度器件的磁电导和磁电致发光效应都表现出不同变化,且相同掺杂厚度的器件在不同偏压和不同温度下的MC以及MEL曲线也有较为明显的规律.利用磁场调控的超精细相互作用(HFI)、单重态激子裂变(STT)和三重态-三重态激子淬灭(TTA)等磁效应理论,对器件的磁效应进行探讨.实验结果证明,通过改变电子传输层掺杂厚度,可以有效控制电子的注入,从而实现对发光层三重态激子浓度的调节,最终达到对有机磁效应的调控.本文对上述现象的研究进一步丰富了有机磁效应的实验规律,同时也提供了一种通过改变掺杂厚度实现有机磁效应调控的新方法.
In this paper,Alq3:Liq is used as the electron transport layer,and the optical-electromagnetic integrated measurement technology is used to study the effect of the electron transport layer on the magnetic-field effect of the organic lightemitting diode.At different voltages and temperatures,we measured the changes in the current intensity and electroluminescence intensity of the device(ITO/MoO3/NPB/Alq3/Alq3:Liq/Cs Cl/Al)with the effect of an external magnetic field,and studied the magnetic conductance effect(MC)and magneto-luminescence effect(MEL)of the device under different voltages and different doping thicknesses.The mechanism of the magnetic-field effect of the device at low temperature is also discussed.The MC and MEL of devices with different doping thicknesses show different changes,moreover,the MC and MEL curves of devices with the same doped thickness at different bias voltages and temperatures also have obvious rules.The magnetic-field effects of the device are discussed using the theory of hyperfine interaction(HFI),singlet exciton fission(STT),and triplet-triplet exciton quenching(TTA).The experimental results prove that by changing the doping thickness of the electron transport layer,the electron injection can be effectively controlled,so that the triplet exciton concentration of the light-emitting layer can be adjusted,and finally the organic magnetic effect can be adjusted.The study of the above phenomena in this paper further enriches the experimental phenomena of organic magnetic-field effects,and also provides a new method for regulating the organic magnetic-field effects by changing the doping thickness of the electron transport layer.
作者
钱雅翠
牛连斌
徐冲
杨明军
崔玉亭
关云霞
张勇
QIAN YaCui;NIU LianBin;XU Chong;YANG MingJun;CUI YuTing;GUAN YunXia;ZHANG Yong(Chongqing Key Laboratory of Optical Engineering,Chongqing Key Laboratory of Optical Electronic Functional Materials,College of Physics and Electronic Engineering,Chongqing Normal University,Chongqing 401331,China;School of Physical Science and Technology,Southwest University,Chongqing 400715,China)
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2020年第7期37-46,共10页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金项目(编号:61874016,11875010)
重庆市基础科学与前沿技术研究专项(编号:CSTC 2017jcyjAX0333,CSTC 2019jcyjmsxmX0148)
重庆市特殊人才支持计划(编号:T04040003)
重庆市洁净能源材料与技术重点实验室开放基金项目(编号:JJNY201907,JJNY201905)资助。
关键词
电子传输层
有机磁效应
三重态激子浓度
electron transport layer
organic magnetic-field effect
triplet exciton concentration
