Highly Efficient and Spectrum‐Tunable Hybrid Tandem White Organic Light‐Emitting Diodes Achieved by Strategic Exciton Management based on Ultrathin Emitting Layer Structures

Author:

Sun Weidong12,Jiao Shujie1,Li Shuaibing2,Zhang Danyang2,Xia Xiaoyang2,Zhou Liang2ORCID

Affiliation:

1. School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 P. R. China

2. State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 P. R. China

Abstract

AbstractHighly efficient hybrid white organic light‐emitting diodes (WOLEDs) featuring a tunable spectrum are constructed based on a tandem structure composed of a blue thermally activated delayed fluorescent (TADF) unit and a bluish‐green TADF/red phosphorescent unit (inserting red ultrathin light‐emitting layer (EML) into bluish‐green EML). The direct carriers’ trapping and multi‐channels energy transfer onto red phosphorescent molecules help to enhance red light preferentially, thus realizing re‐adjustment of the spectrum with increasing driving voltage. Finally, the corresponding WOLED exhibits the maximum external quantum efficiency (EQE) of 44.26%, along with the shift of correlated color temperature (CCT) from 8945 K at 1000 cd m−2 to 5836 K at 5000 cd m−2, and thus to 5078 K at 10 000 cd m−2, achieving efficient spectrum‐tunable cool WOLED. Moreover, by introducing an ultrathin red TADF EML, the obtained WOLED (EQE of 35.67%) achieves obvious variations in chromaticity coordinates and CCT from (0.292, 0.296) and 8469 K at 1000 cd m−2 to (0.352, 0.355) and 4744 K at 5000 cd m−2, and thus to (0.389, 0.397) and 3930 K at 10 000 cd m−2, exhibiting abroad color shift from cool to warm white.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3