Thermally activated delayed fluorescence from 3n π ∗ to 1n π∗ up-conversion and its application to organic light-emitting diodes

Jie Li; Qisheng Zhang; Hiroko Nomura; Hiroshi Miyazaki; Chihaya Adachi

doi:10.1063/1.4887346

Thermally activated delayed fluorescence from ³n π ∗ to ¹n π∗ up-conversion and its application to organic light-emitting diodes

Jie Li, Qisheng Zhang, Hiroko Nomura, Hiroshi Miyazaki, Chihaya Adachi

Applied Chemistry

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

72 Citations (Scopus)

Abstract

Intense nπ∗ fluorescence from a nitrogen-rich heterocyclic compound, 2,5,8-tris(4-fluoro-3-methylphenyl)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3MF), is demonstrated. The overlap-forbidden nature of the nπ∗ transition and the higher energy of the ³ππ∗ state than the ³nπ∗ one lead to a small energy difference between the lowest singlet (S₁) and triplet (T₁) excited states of HAP-3MF. Green-emitting HAP-3MF has a moderate photoluminescence quantum yield of 0.26 in both toluene and doped film. However, an organic light-emitting diode containing HAP-3MF achieved a high external quantum efficiency of 6.0%, indicating that HAP-3MF harvests singlet excitons through a thermally activated T₁ → S₁ pathway in the electroluminescent process.

Original language	English
Article number	013301
Journal	Applied Physics Letters
Volume	105
Issue number	1
DOIs	https://doi.org/10.1063/1.4887346
Publication status	Published - Jul 7 2014

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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title = "Thermally activated delayed fluorescence from 3n π ∗ to 1n π∗ up-conversion and its application to organic light-emitting diodes",

abstract = "Intense nπ∗ fluorescence from a nitrogen-rich heterocyclic compound, 2,5,8-tris(4-fluoro-3-methylphenyl)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3MF), is demonstrated. The overlap-forbidden nature of the nπ∗ transition and the higher energy of the 3ππ∗ state than the 3nπ∗ one lead to a small energy difference between the lowest singlet (S1) and triplet (T1) excited states of HAP-3MF. Green-emitting HAP-3MF has a moderate photoluminescence quantum yield of 0.26 in both toluene and doped film. However, an organic light-emitting diode containing HAP-3MF achieved a high external quantum efficiency of 6.0%, indicating that HAP-3MF harvests singlet excitons through a thermally activated T1 → S1 pathway in the electroluminescent process.",

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T1 - Thermally activated delayed fluorescence from 3n π ∗ to 1n π∗ up-conversion and its application to organic light-emitting diodes

AU - Li, Jie

AU - Zhang, Qisheng

AU - Nomura, Hiroko

AU - Miyazaki, Hiroshi

AU - Adachi, Chihaya

PY - 2014/7/7

Y1 - 2014/7/7

N2 - Intense nπ∗ fluorescence from a nitrogen-rich heterocyclic compound, 2,5,8-tris(4-fluoro-3-methylphenyl)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3MF), is demonstrated. The overlap-forbidden nature of the nπ∗ transition and the higher energy of the 3ππ∗ state than the 3nπ∗ one lead to a small energy difference between the lowest singlet (S1) and triplet (T1) excited states of HAP-3MF. Green-emitting HAP-3MF has a moderate photoluminescence quantum yield of 0.26 in both toluene and doped film. However, an organic light-emitting diode containing HAP-3MF achieved a high external quantum efficiency of 6.0%, indicating that HAP-3MF harvests singlet excitons through a thermally activated T1 → S1 pathway in the electroluminescent process.

AB - Intense nπ∗ fluorescence from a nitrogen-rich heterocyclic compound, 2,5,8-tris(4-fluoro-3-methylphenyl)-1,3,4,6,7,9,9b-heptaazaphenalene (HAP-3MF), is demonstrated. The overlap-forbidden nature of the nπ∗ transition and the higher energy of the 3ππ∗ state than the 3nπ∗ one lead to a small energy difference between the lowest singlet (S1) and triplet (T1) excited states of HAP-3MF. Green-emitting HAP-3MF has a moderate photoluminescence quantum yield of 0.26 in both toluene and doped film. However, an organic light-emitting diode containing HAP-3MF achieved a high external quantum efficiency of 6.0%, indicating that HAP-3MF harvests singlet excitons through a thermally activated T1 → S1 pathway in the electroluminescent process.

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Thermally activated delayed fluorescence from ³n π ∗ to ¹n π∗ up-conversion and its application to organic light-emitting diodes

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