Improving the Performance of Quantum Dot Light-Emitting Diodes by the Enrichment of a Fluorinated Component on Top of a Hole Transport Layer

被引:4
|
作者
Zhong, Zhiming [1 ]
Quan, Huilei [2 ]
Zhang, Jian [2 ]
Peng, Feng [3 ]
Zhong, Wenkai [2 ]
Ying, Lei [2 ]
机构
[1] Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R China
[2] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China
[3] Dongguan Volt Amp Optoelect Technol Co Ltd, Dongguan 523808, Peoples R China
基金
中国国家自然科学基金;
关键词
hole transport layer; gradient component; quantum-dotlight-emitting diodes; surface enrichment; fluorination; HIGH-EFFICIENCY; VOLTAGE; DEVICES;
D O I
10.1021/acsaelm.3c01316
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
The hole transport layers are crucial to the device performance of quantum dot light-emitting diodes (QLEDs) due to the huge hole-injection barrier between the work function of the anode and the valence band of II-VI-type quantum dots (QDs). In this study, we developed a heterogeneous hole transport layer (HTL) consisting of two conjugated polymers with almost identical conjugated backbones and successfully applied it in QLEDs. The introduction of trifluoromethyl groups simultaneously modified surface energy, energy levels, and hole transport mobility, thus altering the heterojunction of HTL/QD and enhancing the device's performance. Based on an optimized weight ratio of poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-4,4 '-(N-(4-s-butylphenyl)diphenylamine)] (TFB)/TF-DCF3 = 7:3, the maximum current efficiency of a red QLED significantly improved from 14.1 cd A(-1) for the reference device based on TFB as the HTL to 23.1 cd A(-1). According to X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry, the blend film with a weight ratio of TFB/TF-DCF3 = 7:3 exhibited a gradient component distribution, with TF-DCF3 enriched on the top surface. Our research sheds light on the advantage of a hole transport layer with a fluorinated component and its application in a QLED and provides an approach to fine-tune the component's vertical distribution of HTL.
引用
收藏
页码:6452 / 6458
页数:7
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