Rational design of hybridized local and charge transfer emitters towards deep blue emission by incorporating extra cyano-based acceptor moieties

Hybridized local and charge transfer (HLCT) molecules have garnered considerable attention for their potential to fully utilize excitons and achieve efficient blue luminescence. Here, we proposed a molecular design strategy of excited state manipulation from locally excited (LE) to HLCT via introduc...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2024-04, Vol.12 (14), p.519-527
Main Authors: Wang, Xinjian, Zhao, Guimin, Gao, Tao, Zhang, Guanghao, Chen, Haowen, Zhou, Tao, Zhang, Zhengmao, Tian, Wenwen, Jiang, Wei, Sun, Yueming
Format: Article
Language:English
Subjects:
Charge transfer
Current efficiency
Cyano groups
Efficiency
Emitters
Energy levels
Excitons
Molecular orbitals
Photoluminescence
Quantum efficiency
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Summary:Hybridized local and charge transfer (HLCT) molecules have garnered considerable attention for their potential to fully utilize excitons and achieve efficient blue luminescence. Here, we proposed a molecular design strategy of excited state manipulation from locally excited (LE) to HLCT via introducing cyano groups. 3ph-phCz and 2(3ph)-phCz without cyano groups are mainly composed of LE components, while 3PhCN-PhCz and 2(3phCN)-phCz are composed of HLCT components and have a deep highest occupied molecular orbital energy level. Analysis of their photophysical properties revealed that the incorporation of the cyano group enhanced the photoluminescence quantum yield of the molecule from 20% to 100% in solution. Non-doped solution-processed 2(3phCN)-phCz based devices achieved a maximum external quantum efficiency of 4.43% and an emission peak at 438 nm, which provides a promising avenue for developing HLCT blue materials. Furthermore, a maximum external quantum efficiency of 17.34% with a maximum current efficiency of 55.67 cd A −1 is obtained for doped devices using 2(3phCN)-phCz as the host. The molecular excited-state manipulation from LE state to HLCT state via introducing cyano groups resulted in a PLQY of 100% in solution and augmented the radiative transition rate, and achieved an EQE of 4.43% and an emission peak at 438 nm.
ISSN:2050-7526
2050-7534
DOI:10.1039/d3tc04808j