journal article·2023-05

Multiple Charge Transfer Processes Enable Blue Emitter for Highly Efficient OLEDs

Zhichuan Wang, Deli Li, Wei Li, Jiasen Zhang, Ming Luo, Songyu Du, Xiaoli Zhang, Shengang Xu, Ziyi Ge

Advanced Optical Materials· Volume 11· Issue 9
Publisher page

Abstract

Abstract Solely through‐space charge transfer (TSCT)‐type thermally activated delayed fluorescent (TADF) emitters exhibit low radiative decay rates (), while solely through‐bond charge transfer (TBCT) type TADF emitters generally suffer from low reverse intersystem crossing (RISC) rates (kRISC). Here, PhCzSpiroS‐TRZ with versatile spiro‐heterocyclic architecture and an extra donor of 9‐phenyl‐9H‐carbazole are developed as emitter and ideal host for TADF‐ and TADF‐sensitized fluorescence (TSF) organic light‐emitting diodes (OLEDs) in detail. Abandoning solely TSCT or TBCT process, PhCzSpiroS‐TRZ with multiple charge transfer characteristic exhibits photoluminescence quantum yield of 96.3% and of 2.2 × 107 s−1, which is considerably higher among all the reported TSCT‐TADF molecules. Noticeably, state‐of‐the‐art blue OLEDs using PhCzSpiroS‐TRZ as emitter and sensitizer show maximum external quantum efficiencies (EQEs) of 33.6% and 32.8%, ranking among TADF materials for achieving EQEs >30% in both TADF‐ and TSF‐OLEDs.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China

Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China

School of Materials Science and Engineering Zhengzhou University Zhengzhou 450001 P. R. China

State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of Technology Wushan Road 381, Tianhe District Guangzhou Guangdong Province 510640 P. R. China

Funding

National Science Fund for Distinguished Young Scholars · National Natural Science Foundation of China

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