Ultrafast photophysics of an orange–red thermally activated delayed fluorescence emitter: the role of external structural restraint

Gao, Yixuan; Wang, Yaxin; Guo, Zilong; Wan, Yan; Xue, Zheng; Han, Yandong; Yang, Wensheng; Ma, Xiaonan

doi:10.1039/d4sc00460d

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Chem. Sci.

2024

DOI: 10.1039/d4sc00460d

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Ultrafast photophysics of an orange–red thermally activated delayed fluorescence emitter: the role of external structural restraint

Yixuan Gao,

Yaxin Wang,

Zilong Guo

et al.

Abstract: Non-radiative decay of orange–red TADF emitters are strongly associated with excited-state structural relaxation through promoting vibrational modes, for which external structural restraint is critical for achieving high OLED emitting efficiency.

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2024

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Cited by 2 publications

References 82 publications

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Ultrafast photophysics of para-substituted 2,5-bis(arylethynyl) rhodacyclopentadienes: thermally activated intersystem crossing

Guo,

Wang,

Heitmüller

et al. 2024

Chem. Sci.

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Ultrafast photophysics of para-substituted 2,5-bis(arylethynyl) rhodacyclopentadienes: thermally activated intersystem crossing

Guo,

Wang,

Heitmüller

et al. 2024

Chem. Sci.

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High EQE of 43.76% in solution-processed OLEDs operating at a wavelength of 626 nm

Zhang,

Wu,

Zheng

et al. 2024

Applied Physics Letters

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Simultaneously achieving high-efficiency, deep-red emission, and solution-processed organic light-emitting diodes (OLEDs) remains a huge challenge. In this work, a thermally activated delayed fluorescent (TADF) material of CzPXZ that exhibits aggregation-induced emission property and a deep-red phosphorescent emitter of Ir(dmppy)(piq)2(od) are developed to build effective energy transfer pathways by dissolving them in a non-polar organic solvent. The electroluminescent emission peaks of CzPXZ:Ir(III)-based OLEDs are located at deep-red 626 nm, demonstrating efficient energy transfer from CzPXZ to the Ir(III) complex. Furthermore, an optimized DPEPO hole-blocking layer is utilized in such Ir(III)-doped OLEDs to enhance the radiative recombination. Therefore, a high external quantum efficiency of 43.76% is achieved for CzPXZ:Ir(III)-based OLEDs. This work sheds light on the great potential of energy transfer from AIE-TADF to red phosphorescent emitters for high-efficiency, solution-processed, deep-red OLEDs.

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Ultrafast photophysics of an orange–red thermally activated delayed fluorescence emitter: the role of external structural restraint

Abstract: Non-radiative decay of orange–red TADF emitters are strongly associated with excited-state structural relaxation through promoting vibrational modes, for which external structural restraint is critical for achieving high OLED emitting efficiency.

Cited by 2 publications

References 82 publications

Ultrafast photophysics of para-substituted 2,5-bis(arylethynyl) rhodacyclopentadienes: thermally activated intersystem crossing

Ultrafast photophysics of para-substituted 2,5-bis(arylethynyl) rhodacyclopentadienes: thermally activated intersystem crossing

High EQE of 43.76% in solution-processed OLEDs operating at a wavelength of 626 nm

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