journal article·2022-10Open access

Y‐Shaped Pyrene‐Based Aggregation‐Induced Emission Blue Emitters for High‐Performance OLED Devices

Jin Zeng, Nuoling Qiu, Jianyu Zhang, Xiaohui Wang, Carl Redshaw, Xing Feng, Jacky W. Y. Lam, Zujin Zhao, Ben Zhong Tang

Advanced Optical Materials· Volume 10· Issue 19

Abstract

Abstract The proposed concept of aggregation‐induced emission (AIE) has offered an efficient strategy to design high‐performance luminescent materials. Herein, three blue emitters containing a pyrene core decorated with either triphenylamine or tetraphenylethylene units are presented. The designed compounds Py‐TPA and Py‐2TPE are AIE or active materials with blue emission from 464 to 478 nm in the solid state, whereas Py‐2TPA is not. Moreover, the enhanced thermal stability of compounds Py‐TPA and Py‐2TPE allows for their utilization as emitter layers for the fabrication of blue organic light‐emitting diode (OLED) devices. The devices exhibit excellent electroluminescence emission with maximum λmax em in the range 456–482 nm with a maximum external quantum efficiency of 7.27%, high exciton utilization efficiency (77.3%), and low turn‐on voltage (≤3.1 V), as well as low‐efficiency roll‐off. Theoretical calculations reveal that the high exciton utilization efficiency (ƞr) originates from the triplet excitons at T2 to the lowest single excited (S1) state via a reverse intersystem crossing process following the principle of the “hot exciton” mechanism. This article not only provides powerful evidence revealing the advantages of pyrene‐based AIEgens for OLED applications, but also offers a new approach for designing pyrene‐based “hot exciton” materials for next‐generation OLEDs.
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Research context

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

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

Affiliations

Guangdong Provincial Key Laboratory of Information Photonics Technology School of Material and Energy Guangdong University of Technology Guangzhou 510006 P. R. China

State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of Technology Guangzhou 510640 P. R. China

Department of Chemistry the Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction and Guangdong‐Hong Kong‐Macro Joint Laboratory of Optoelectronic and Magnetic Functional Materials The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China

Department of Chemistry University of Hull Cottingham Road Hull Yorkshire HU6 7RX UK

Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates (South China University of Technology) Guangzhou 510640 P. R. China

School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong Shenzhen Guangdong 518172 P. R. China

Funding

National Natural Science Foundation of China

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