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

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

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 478nm 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 456–482nm with a maximum external quantum efficiency of 7.27%, high exciton utilization efficiency (77.3%), and low turn-on voltage (≤3.1V), 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.

Citation

Zeng, J., Qiu, N., Zhang, J., Wang, X., Redshaw, C., Feng, X., …Tang, B. Z. (2022). Y-Shaped Pyrene-Based Aggregation-Induced Emission Blue Emitters for High-Performance OLED Devices. Advanced Optical Materials, Article 2200917. https://doi.org/10.1002/adom.202200917

• Journal Article Type: Article
• Acceptance Date: Jun 19, 2022
• Online Publication Date: Jul 13, 2022
• Publication Date: Jul 13, 2022
• Deposit Date: Jul 21, 2022
• Publicly Available Date: Jul 14, 2023
• Journal: Advanced Optical Materials
• Print ISSN: 2195-1071
• Electronic ISSN: 2195-1071
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Article Number: 2200917
• DOI: https://doi.org/10.1002/adom.202200917
• Keywords: Aggregation-induced emission; Blue emitter; Hot exciton mechanism; Organic light-emitting diode; Pyrene
• Public URL: https://hull-repository.worktribe.com/output/4032951