Contribution of TADF and exciplex emission for efficient "warm-white" OLEDs

Gintare Grybauskaite-Kaminskiene; Khrystyna Ivaniuk; Gintautas Bagdziunas; Pavlo Turyk; Pavlo Stakhira; Gleb Baryshnikov; Dmytro Volyniuk; Vladyslav Cherpak; Boris Minaev; Zenon Hotra; Hans Ågren; Juozas Vidas Grazulevicius

doi:10.1039/c7tc05392d

Contribution of TADF and exciplex emission for efficient "warm-white" OLEDs

Gintare Grybauskaite-Kaminskiene
, Khrystyna Ivaniuk
, Gintautas Bagdziunas
, Pavlo Turyk
, Pavlo Stakhira
, Gleb Baryshnikov
, Dmytro Volyniuk
, Vladyslav Cherpak
, Boris Minaev
, Zenon Hotra
, Hans Ågren
, Juozas Vidas Grazulevicius^*

^*Corresponding author for this work

Kaunas University of Technology
Lviv Polytechnic National University
KTH Royal Institute of Technology
Bohdan Khmelnytsky National University of Cherkasy
Georgia Institute of Technology
Rzeszów University of Technology
Siberian Federal University

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

74 Scopus citations

Abstract

The bicarbazole derivative 4,4′-(9H,9′H-[3,3′-bicarbazole]-9,9′-diyl)bis(3-(trifluoromethyl)benzonitrile), denoted as pCNBCzoCF₃, was synthesized and tested for white OLED applications. pCNBCzoCF₃ demonstrated an extremely small value of the singlet-triplet energy gap that caused intensive thermally activated delayed fluorescence (TADF). In addition, this compound is able to form exciplex-type excited states at the interface with star-shaped 4,4′,4′′-tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA). Combining the TADF emission of pCNBCzoCF₃ with the exciplex emission from the pCNBCzoCF₃/m-MTDATA interface, we fabricated a number of highly efficient "warm-white" OLEDs, the electroluminescence of which was close to candle emission. The best device demonstrated a very high brightness of 40900 Cd m^-2 (at 15 V), current efficiency of 53.8 Cd A^-1 and power efficiency of 19.3 lm W^-1, while the external quantum efficiency reached 18.8%. The fabricated devices demonstrated high emission characteristics even for the standard test at 1000 Cd m^-2 (current efficiency of 46.2 Cd A^-1, power efficiency of 10.6 lm W^-1, EQE of 17.0%).

Original language	English
Pages (from-to)	1543-1550
Number of pages	8
Journal	Journal of Materials Chemistry C
Volume	6
Issue number	6
DOIs	https://doi.org/10.1039/c7tc05392d
State	Published - 2018
Externally published	Yes

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@article{f4d0564c97794e71b8c08ee5bee2f6c4,

title = "Contribution of TADF and exciplex emission for efficient {"}warm-white{"} OLEDs",

abstract = "The bicarbazole derivative 4,4′-(9H,9′H-[3,3′-bicarbazole]-9,9′-diyl)bis(3-(trifluoromethyl)benzonitrile), denoted as pCNBCzoCF3, was synthesized and tested for white OLED applications. pCNBCzoCF3 demonstrated an extremely small value of the singlet-triplet energy gap that caused intensive thermally activated delayed fluorescence (TADF). In addition, this compound is able to form exciplex-type excited states at the interface with star-shaped 4,4′,4′′-tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA). Combining the TADF emission of pCNBCzoCF3 with the exciplex emission from the pCNBCzoCF3/m-MTDATA interface, we fabricated a number of highly efficient {"}warm-white{"} OLEDs, the electroluminescence of which was close to candle emission. The best device demonstrated a very high brightness of 40900 Cd m-2 (at 15 V), current efficiency of 53.8 Cd A-1 and power efficiency of 19.3 lm W-1, while the external quantum efficiency reached 18.8\%. The fabricated devices demonstrated high emission characteristics even for the standard test at 1000 Cd m-2 (current efficiency of 46.2 Cd A-1, power efficiency of 10.6 lm W-1, EQE of 17.0\%).",

author = "Gintare Grybauskaite-Kaminskiene and Khrystyna Ivaniuk and Gintautas Bagdziunas and Pavlo Turyk and Pavlo Stakhira and Gleb Baryshnikov and Dmytro Volyniuk and Vladyslav Cherpak and Boris Minaev and Zenon Hotra and Hans {\AA}gren and Grazulevicius, \{Juozas Vidas\}",

note = "Publisher Copyright: {\textcopyright} 2018 The Royal Society of Chemistry.",

year = "2018",

doi = "10.1039/c7tc05392d",

language = "英语",

volume = "6",

pages = "1543--1550",

journal = "Journal of Materials Chemistry C",

issn = "2050-7526",

publisher = "Royal Society of Chemistry",

number = "6",

}

TY - JOUR

T1 - Contribution of TADF and exciplex emission for efficient "warm-white" OLEDs

AU - Grybauskaite-Kaminskiene, Gintare

AU - Ivaniuk, Khrystyna

AU - Bagdziunas, Gintautas

AU - Turyk, Pavlo

AU - Stakhira, Pavlo

AU - Baryshnikov, Gleb

AU - Volyniuk, Dmytro

AU - Cherpak, Vladyslav

AU - Minaev, Boris

AU - Hotra, Zenon

AU - Ågren, Hans

AU - Grazulevicius, Juozas Vidas

PY - 2018

Y1 - 2018

N2 - The bicarbazole derivative 4,4′-(9H,9′H-[3,3′-bicarbazole]-9,9′-diyl)bis(3-(trifluoromethyl)benzonitrile), denoted as pCNBCzoCF3, was synthesized and tested for white OLED applications. pCNBCzoCF3 demonstrated an extremely small value of the singlet-triplet energy gap that caused intensive thermally activated delayed fluorescence (TADF). In addition, this compound is able to form exciplex-type excited states at the interface with star-shaped 4,4′,4′′-tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA). Combining the TADF emission of pCNBCzoCF3 with the exciplex emission from the pCNBCzoCF3/m-MTDATA interface, we fabricated a number of highly efficient "warm-white" OLEDs, the electroluminescence of which was close to candle emission. The best device demonstrated a very high brightness of 40900 Cd m-2 (at 15 V), current efficiency of 53.8 Cd A-1 and power efficiency of 19.3 lm W-1, while the external quantum efficiency reached 18.8%. The fabricated devices demonstrated high emission characteristics even for the standard test at 1000 Cd m-2 (current efficiency of 46.2 Cd A-1, power efficiency of 10.6 lm W-1, EQE of 17.0%).

AB - The bicarbazole derivative 4,4′-(9H,9′H-[3,3′-bicarbazole]-9,9′-diyl)bis(3-(trifluoromethyl)benzonitrile), denoted as pCNBCzoCF3, was synthesized and tested for white OLED applications. pCNBCzoCF3 demonstrated an extremely small value of the singlet-triplet energy gap that caused intensive thermally activated delayed fluorescence (TADF). In addition, this compound is able to form exciplex-type excited states at the interface with star-shaped 4,4′,4′′-tris[phenyl(m-tolyl)amino]triphenylamine (m-MTDATA). Combining the TADF emission of pCNBCzoCF3 with the exciplex emission from the pCNBCzoCF3/m-MTDATA interface, we fabricated a number of highly efficient "warm-white" OLEDs, the electroluminescence of which was close to candle emission. The best device demonstrated a very high brightness of 40900 Cd m-2 (at 15 V), current efficiency of 53.8 Cd A-1 and power efficiency of 19.3 lm W-1, while the external quantum efficiency reached 18.8%. The fabricated devices demonstrated high emission characteristics even for the standard test at 1000 Cd m-2 (current efficiency of 46.2 Cd A-1, power efficiency of 10.6 lm W-1, EQE of 17.0%).

UR - https://www.scopus.com/pages/publications/85041723510

U2 - 10.1039/c7tc05392d

DO - 10.1039/c7tc05392d

M3 - 文章

AN - SCOPUS:85041723510

SN - 2050-7526

VL - 6

SP - 1543

EP - 1550

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 6

ER -

Contribution of TADF and exciplex emission for efficient "warm-white" OLEDs

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