Twisted intramolecular charge transfer state for long-wavelength thermally activated delayed fluorescence

Hiroyuki Tanaka; Katsuyuki Shizu; Hajime Nakanotani; Chihaya Adachi

doi:10.1021/cm402428a

Twisted intramolecular charge transfer state for long-wavelength thermally activated delayed fluorescence

Hiroyuki Tanaka, Katsuyuki Shizu, Hajime Nakanotani, Chihaya Adachi

Research output: Contribution to journal › Article › peer-review

214 Citations (Scopus)

Abstract

Emission wavelength tuning of thermally activated delayed fluorescence from green to orange in solid state films is demonstrated. Emission tuning occurs by stabilization of the intramolecular charge transfer state between a phenoxazine (PXZ) donor unit and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor unit separated by a large twist angle. The emission wavelengths of mono-, bis-, and tri-PXZ-substituted TRZ exhibit a gradual red shift while maintaining a small energy gap between the singlet and triplet excited states. An organic light-emitting diode containing a tri-PXZ-TRZ emitter exhibited a maximum external quantum efficiency of 13.3 ± 0.5% with yellow-orange emission.

Original language	English
Pages (from-to)	3766-3771
Number of pages	6
Journal	Chemistry of Materials
Volume	25
Issue number	18
DOIs	https://doi.org/10.1021/cm402428a
Publication status	Published - Sep 24 2013

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

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title = "Twisted intramolecular charge transfer state for long-wavelength thermally activated delayed fluorescence",

abstract = "Emission wavelength tuning of thermally activated delayed fluorescence from green to orange in solid state films is demonstrated. Emission tuning occurs by stabilization of the intramolecular charge transfer state between a phenoxazine (PXZ) donor unit and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor unit separated by a large twist angle. The emission wavelengths of mono-, bis-, and tri-PXZ-substituted TRZ exhibit a gradual red shift while maintaining a small energy gap between the singlet and triplet excited states. An organic light-emitting diode containing a tri-PXZ-TRZ emitter exhibited a maximum external quantum efficiency of 13.3 ± 0.5% with yellow-orange emission.",

author = "Hiroyuki Tanaka and Katsuyuki Shizu and Hajime Nakanotani and Chihaya Adachi",

year = "2013",

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doi = "10.1021/cm402428a",

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TY - JOUR

T1 - Twisted intramolecular charge transfer state for long-wavelength thermally activated delayed fluorescence

AU - Tanaka, Hiroyuki

AU - Shizu, Katsuyuki

AU - Nakanotani, Hajime

AU - Adachi, Chihaya

PY - 2013/9/24

Y1 - 2013/9/24

N2 - Emission wavelength tuning of thermally activated delayed fluorescence from green to orange in solid state films is demonstrated. Emission tuning occurs by stabilization of the intramolecular charge transfer state between a phenoxazine (PXZ) donor unit and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor unit separated by a large twist angle. The emission wavelengths of mono-, bis-, and tri-PXZ-substituted TRZ exhibit a gradual red shift while maintaining a small energy gap between the singlet and triplet excited states. An organic light-emitting diode containing a tri-PXZ-TRZ emitter exhibited a maximum external quantum efficiency of 13.3 ± 0.5% with yellow-orange emission.

AB - Emission wavelength tuning of thermally activated delayed fluorescence from green to orange in solid state films is demonstrated. Emission tuning occurs by stabilization of the intramolecular charge transfer state between a phenoxazine (PXZ) donor unit and 2,4,6-triphenyl-1,3,5-triazine (TRZ) acceptor unit separated by a large twist angle. The emission wavelengths of mono-, bis-, and tri-PXZ-substituted TRZ exhibit a gradual red shift while maintaining a small energy gap between the singlet and triplet excited states. An organic light-emitting diode containing a tri-PXZ-TRZ emitter exhibited a maximum external quantum efficiency of 13.3 ± 0.5% with yellow-orange emission.

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