High-efficiency/CRI/color stability warm white organic light-emitting diodes by incorporating ultrathin phosphorescence layers in a blue fluorescence layer

Nanophotonics

article

Yanqin Miao¹  Furong Zhu²  Kexiang Wang¹  Bo Zhao¹  Long Gao¹  Peng Tao¹  Xuguang Liu³  Yuying Hao⁴  Hua Wang¹  Bingshe Xu¹ 

[1] Key Laboratory of Interface Science and Engineering in Advanced Materials of the Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology;Department of Physics, Institute of Advanced Materials, and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University;College of Chemistry and Chemical Engineering, Taiyuan University of Technology;Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education, College of Physics and Optoelectronics, Taiyuan University of Technology

关键词: white organic light-emitting diodes;    ultrathin layer;    warm white;    color stability;    CRI;    EQE;   

DOI  :  10.1515/nanoph-2017-0021

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

By incorporating ultrathin (80, low correlated color temperature of <3600 K, and high color stability at a wide voltage range of 5 V–9 V. These hybrid WOLEDs also reveal high forward-viewing external quantum efficiencies (EQE) of 17.82%–19.34%, which are close to the theoretical value of 20%, indicating an almost complete exciton harvesting. In addition, the electroluminescence spectra of the hybrid WOLEDs can be easily improved by only changing the incorporating sequence of the ultrathin phosphorescence layers without device efficiency loss. For example, the hybrid WOLED with an incorporation sequence of ultrathin red/yellow/green phosphorescence layers exhibits an ultra-high CRI of 96 and a high EQE of 19.34%. To the best of our knowledge, this is the first WOLED with good tradeoff among device efficiency, CRI, and color stability. The introduction of ultrathin (<0.1 nm) phosphorescence layers can also greatly reduce the consumption of phosphorescent emitters as well as simplify device structures and fabrication process, thus leading to low cost. Such a finding is very meaningful for the potential commercialization of hybrid WOLEDs.

【 授权许可】

CC BY