Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence

Research output: Contribution to journalArticle

224 Citations (Scopus)

Abstract

We study external quantum efficiency (ηEQE) roll-off in organic light-emitting diodes (OLEDs) using thermally-activated delayed fluorescence (TADF) of 4,5-di (9H-carbazol-9-yl) phthalonitrile (2CzPN). Using 2CzPN intramolecular rate constants from optical analyses, we construct an exciton quenching model incorporating intersystem crossing and reverse intersystem crossing. The model indicates that singlet-triplet annihilation and triplet-triplet annihilation dominate ηEQE roll-off because of the relatively long 2CzPN triplet lifetime of 273 μs. This work yields a method to relax the exciton quenching process in TADF based OLEDs.

Original languageEnglish
Pages (from-to)2721-2726
Number of pages6
JournalOrganic Electronics
Volume14
Issue number11
DOIs
Publication statusPublished - Jan 1 2013

Fingerprint

Organic light emitting diodes (OLED)
Quantum efficiency
Excitons
sky
quantum efficiency
Quenching
light emitting diodes
Fluorescence
quenching
excitons
fluorescence
Rate constants
life (durability)
LDS 751

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

@article{0acd8f62bd1a46acbc6cf0f502d85da0,
title = "Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence",
abstract = "We study external quantum efficiency (ηEQE) roll-off in organic light-emitting diodes (OLEDs) using thermally-activated delayed fluorescence (TADF) of 4,5-di (9H-carbazol-9-yl) phthalonitrile (2CzPN). Using 2CzPN intramolecular rate constants from optical analyses, we construct an exciton quenching model incorporating intersystem crossing and reverse intersystem crossing. The model indicates that singlet-triplet annihilation and triplet-triplet annihilation dominate ηEQE roll-off because of the relatively long 2CzPN triplet lifetime of 273 μs. This work yields a method to relax the exciton quenching process in TADF based OLEDs.",
author = "Kensuke Masui and Hajime Nakanotani and Chihaya Adachi",
year = "2013",
month = "1",
day = "1",
doi = "10.1016/j.orgel.2013.07.010",
language = "English",
volume = "14",
pages = "2721--2726",
journal = "Organic Electronics: physics, materials, applications",
issn = "1566-1199",
publisher = "Elsevier",
number = "11",

}

TY - JOUR

T1 - Analysis of exciton annihilation in high-efficiency sky-blue organic light-emitting diodes with thermally activated delayed fluorescence

AU - Masui, Kensuke

AU - Nakanotani, Hajime

AU - Adachi, Chihaya

PY - 2013/1/1

Y1 - 2013/1/1

N2 - We study external quantum efficiency (ηEQE) roll-off in organic light-emitting diodes (OLEDs) using thermally-activated delayed fluorescence (TADF) of 4,5-di (9H-carbazol-9-yl) phthalonitrile (2CzPN). Using 2CzPN intramolecular rate constants from optical analyses, we construct an exciton quenching model incorporating intersystem crossing and reverse intersystem crossing. The model indicates that singlet-triplet annihilation and triplet-triplet annihilation dominate ηEQE roll-off because of the relatively long 2CzPN triplet lifetime of 273 μs. This work yields a method to relax the exciton quenching process in TADF based OLEDs.

AB - We study external quantum efficiency (ηEQE) roll-off in organic light-emitting diodes (OLEDs) using thermally-activated delayed fluorescence (TADF) of 4,5-di (9H-carbazol-9-yl) phthalonitrile (2CzPN). Using 2CzPN intramolecular rate constants from optical analyses, we construct an exciton quenching model incorporating intersystem crossing and reverse intersystem crossing. The model indicates that singlet-triplet annihilation and triplet-triplet annihilation dominate ηEQE roll-off because of the relatively long 2CzPN triplet lifetime of 273 μs. This work yields a method to relax the exciton quenching process in TADF based OLEDs.

UR - http://www.scopus.com/inward/record.url?scp=84882369581&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84882369581&partnerID=8YFLogxK

U2 - 10.1016/j.orgel.2013.07.010

DO - 10.1016/j.orgel.2013.07.010

M3 - Article

AN - SCOPUS:84882369581

VL - 14

SP - 2721

EP - 2726

JO - Organic Electronics: physics, materials, applications

JF - Organic Electronics: physics, materials, applications

SN - 1566-1199

IS - 11

ER -