Enhanced electroluminescence from a thermally activated delayed-fluorescence emitter by suppressing nonradiative decay

Katsuyuki Shizu, Motoyuki Uejima, Hiroko Nomura, Tohru Sato, Kazuyoshi Tanaka, Hironori Kaji, Chihaya Adachi

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

Thermally activated delayed-fluorescence (TADF) is a promising approach for realizing highly efficient organic light-emitting diodes (OLEDs). By controlling the spatial overlap between the frontier orbitals to suppress nonradiative decay, we develop a highly efficient TADF emitter, N1-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-N1-[4-(diphenylamino)-phenyl]-N4, N4-diphenylbenzene-1,4-diamine (DPA-TRZ). DPA-TRZ exhibits a photoluminescence quantum efficiency of 100% when doped into a host material, suggesting that nonradiative decay from its excited states is completely suppressed. Transient photoluminescence measurements confirm that DPA-TRZ emits TADF in a doped film. An OLED containing DPA-TRZ as a green emitter shows a maximum external quantum efficiency of 13.8%, which exceeds the theoretical limit for conventional fluorescent OLEDs. This high efficiency results from the effective generation of TADF and suppressed nonradiative decay in DPA-TRZ. Our molecular design strategy based on quantum chemistry provides a rational approach to control radiative and nonradiative decays for optimizing TADF materials.

Original languageEnglish
Article number014001
JournalPhysical Review Applied
Volume3
Issue number1
DOIs
Publication statusPublished - Jan 9 2015

Fingerprint

electroluminescence
emitters
fluorescence
decay
light emitting diodes
quantum efficiency
photoluminescence
quantum chemistry
diamines
orbitals
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Enhanced electroluminescence from a thermally activated delayed-fluorescence emitter by suppressing nonradiative decay. / Shizu, Katsuyuki; Uejima, Motoyuki; Nomura, Hiroko; Sato, Tohru; Tanaka, Kazuyoshi; Kaji, Hironori; Adachi, Chihaya.

In: Physical Review Applied, Vol. 3, No. 1, 014001, 09.01.2015.

Research output: Contribution to journalArticle

Shizu, Katsuyuki ; Uejima, Motoyuki ; Nomura, Hiroko ; Sato, Tohru ; Tanaka, Kazuyoshi ; Kaji, Hironori ; Adachi, Chihaya. / Enhanced electroluminescence from a thermally activated delayed-fluorescence emitter by suppressing nonradiative decay. In: Physical Review Applied. 2015 ; Vol. 3, No. 1.
@article{73a0ec8860cc4266834958d457d54b6b,
title = "Enhanced electroluminescence from a thermally activated delayed-fluorescence emitter by suppressing nonradiative decay",
abstract = "Thermally activated delayed-fluorescence (TADF) is a promising approach for realizing highly efficient organic light-emitting diodes (OLEDs). By controlling the spatial overlap between the frontier orbitals to suppress nonradiative decay, we develop a highly efficient TADF emitter, N1-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-N1-[4-(diphenylamino)-phenyl]-N4, N4-diphenylbenzene-1,4-diamine (DPA-TRZ). DPA-TRZ exhibits a photoluminescence quantum efficiency of 100{\%} when doped into a host material, suggesting that nonradiative decay from its excited states is completely suppressed. Transient photoluminescence measurements confirm that DPA-TRZ emits TADF in a doped film. An OLED containing DPA-TRZ as a green emitter shows a maximum external quantum efficiency of 13.8{\%}, which exceeds the theoretical limit for conventional fluorescent OLEDs. This high efficiency results from the effective generation of TADF and suppressed nonradiative decay in DPA-TRZ. Our molecular design strategy based on quantum chemistry provides a rational approach to control radiative and nonradiative decays for optimizing TADF materials.",
author = "Katsuyuki Shizu and Motoyuki Uejima and Hiroko Nomura and Tohru Sato and Kazuyoshi Tanaka and Hironori Kaji and Chihaya Adachi",
year = "2015",
month = "1",
day = "9",
doi = "10.1103/PhysRevApplied.3.014001",
language = "English",
volume = "3",
journal = "Physical Review Applied",
issn = "2331-7019",
publisher = "American Physical Society",
number = "1",

}

TY - JOUR

T1 - Enhanced electroluminescence from a thermally activated delayed-fluorescence emitter by suppressing nonradiative decay

AU - Shizu, Katsuyuki

AU - Uejima, Motoyuki

AU - Nomura, Hiroko

AU - Sato, Tohru

AU - Tanaka, Kazuyoshi

AU - Kaji, Hironori

AU - Adachi, Chihaya

PY - 2015/1/9

Y1 - 2015/1/9

N2 - Thermally activated delayed-fluorescence (TADF) is a promising approach for realizing highly efficient organic light-emitting diodes (OLEDs). By controlling the spatial overlap between the frontier orbitals to suppress nonradiative decay, we develop a highly efficient TADF emitter, N1-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-N1-[4-(diphenylamino)-phenyl]-N4, N4-diphenylbenzene-1,4-diamine (DPA-TRZ). DPA-TRZ exhibits a photoluminescence quantum efficiency of 100% when doped into a host material, suggesting that nonradiative decay from its excited states is completely suppressed. Transient photoluminescence measurements confirm that DPA-TRZ emits TADF in a doped film. An OLED containing DPA-TRZ as a green emitter shows a maximum external quantum efficiency of 13.8%, which exceeds the theoretical limit for conventional fluorescent OLEDs. This high efficiency results from the effective generation of TADF and suppressed nonradiative decay in DPA-TRZ. Our molecular design strategy based on quantum chemistry provides a rational approach to control radiative and nonradiative decays for optimizing TADF materials.

AB - Thermally activated delayed-fluorescence (TADF) is a promising approach for realizing highly efficient organic light-emitting diodes (OLEDs). By controlling the spatial overlap between the frontier orbitals to suppress nonradiative decay, we develop a highly efficient TADF emitter, N1-[4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl]-N1-[4-(diphenylamino)-phenyl]-N4, N4-diphenylbenzene-1,4-diamine (DPA-TRZ). DPA-TRZ exhibits a photoluminescence quantum efficiency of 100% when doped into a host material, suggesting that nonradiative decay from its excited states is completely suppressed. Transient photoluminescence measurements confirm that DPA-TRZ emits TADF in a doped film. An OLED containing DPA-TRZ as a green emitter shows a maximum external quantum efficiency of 13.8%, which exceeds the theoretical limit for conventional fluorescent OLEDs. This high efficiency results from the effective generation of TADF and suppressed nonradiative decay in DPA-TRZ. Our molecular design strategy based on quantum chemistry provides a rational approach to control radiative and nonradiative decays for optimizing TADF materials.

UR - http://www.scopus.com/inward/record.url?scp=84936852701&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84936852701&partnerID=8YFLogxK

U2 - 10.1103/PhysRevApplied.3.014001

DO - 10.1103/PhysRevApplied.3.014001

M3 - Article

AN - SCOPUS:84936852701

VL - 3

JO - Physical Review Applied

JF - Physical Review Applied

SN - 2331-7019

IS - 1

M1 - 014001

ER -