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

Research output: Contribution to journalArticle

36 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 languageEnglish
Article number013301
JournalApplied Physics Letters
Volume105
Issue number1
DOIs
Publication statusPublished - Jul 7 2014

Fingerprint

light emitting diodes
heterocyclic compounds
fluorescence
toluene
quantum efficiency
excitons
photoluminescence
nitrogen
energy
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Thermally activated delayed fluorescence from 3n π ∗ to 1n π∗ up-conversion and its application to organic light-emitting diodes. / Li, Jie; Zhang, Qisheng; Nomura, Hiroko; Miyazaki, Hiroshi; Adachi, Chihaya.

In: Applied Physics Letters, Vol. 105, No. 1, 013301, 07.07.2014.

Research output: Contribution to journalArticle

@article{2ee977d9965f410c87e8fd8985d43f70,
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.",
author = "Jie Li and Qisheng Zhang and Hiroko Nomura and Hiroshi Miyazaki and Chihaya Adachi",
year = "2014",
month = "7",
day = "7",
doi = "10.1063/1.4887346",
language = "English",
volume = "105",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "1",

}

TY - JOUR

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.

UR - http://www.scopus.com/inward/record.url?scp=84908502631&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84908502631&partnerID=8YFLogxK

U2 - 10.1063/1.4887346

DO - 10.1063/1.4887346

M3 - Article

AN - SCOPUS:84908502631

VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 1

M1 - 013301

ER -