Highly Efficient and Solution-Processed Single-Emissive-Layer Hybrid White Organic Light-Emitting Diodes with Tris(triazolo)triazine-Based Blue Thermally Activated Delayed Fluorescence Emitter

被引:26
作者
Chen, Xinrui [1 ]
Wang, Shengyue [1 ]
Lee, Ha Lim [2 ]
Lee, Jun Yeob [2 ]
Liao, Xiaoqing [3 ]
Li, Lu [3 ]
Zhu, Weiguo [1 ]
Wang, Yafei [1 ]
机构
[1] Changzhou Univ, Sch Mat Sci & Engn, Jiangsu Engn Lab Light Elect Heat Energy Converti, Changzhou 213164, Peoples R China
[2] Sungkyunkwan Univ, Sch Chem Engn, 2066 Seobu Ro, Suwon, Gyeonggi Do, South Korea
[3] Chongqing Univ Arts & Sci, Res Inst New Mat Technol, Coinnovat Ctr Micro Nano Optoelect Mat & Devices, Chongqing 402160, Peoples R China
基金
中国国家自然科学基金;
关键词
hybrid white light; solution-processable OLEDs; thermally activated delayed fluorescence; tristriazolotriazine; HIGH QUANTUM EFFICIENCY; TRIPLET EXCITONS; RECENT PROGRESS; HOST; MANAGEMENT; STRATEGY; DEVICES; DESIGN;
D O I
10.1002/adom.202101518
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Solution processable organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) emitters show inferior efficiency to devices produced via vacuum deposition. In this context, solution-processed hybrid white OLEDs are fabricated using a TADF molecule and iridium complex as the blue and red dopants, respectively. First, solution-processed OLEDs employing a tristriazolotriazine-based TADF as the blue dopant are designed and fabricated, yielding maximum external quantum efficiency (EQE(max)) of 23.23% with an emission peak at 492 nm. Use of the optimized tristriazolotriazine-based TADF OLED structure and additional red phosphor achieves highly efficient white light emission with an EQE(max) of 22.57%, stable Commission International de l'Eclairage (CIE) coordinates of (0.34, 0.34), a correlated color temperature of 5000 K, and a color rendering index of 73. Impressively, accelerated lifetime testing shows the white OLED possessing a lifetime to 80% of initial luminance (LT80) of 40 h, and an LT50 of 298 h. To the best of knowledge, the device performance demonstrated in this work is one of the best comprised of solution-processed blue and fluorescent-phosphorescent hybrid white OLEDs. This research provides a reliable method for high efficiency solution processable blue TADF and TADF-phosphorescent hybrid OLEDs.
引用
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页数:9
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