Synthesis of a dibenzothiophene/carboline/carbazole hybrid bipolar host material for green phosphorescent OLEDs

Jin Woo Jun; Kyung Mi Lee; Oh Young Kim; Jun Yeob Lee; Seok Ho Hwang

doi:10.1016/j.synthmet.2015.12.022

Synthesis of a dibenzothiophene/carboline/carbazole hybrid bipolar host material for green phosphorescent OLEDs

Jin Woo Jun
, Kyung Mi Lee
, Oh Young Kim
, Jun Yeob Lee
, Seok Ho Hwang

Department of Chemical Engineering

Dankook University

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

18 Scopus citations

Abstract

A bipolar host material for green phosphorescent organic light-emitting diodes (OLEDs) was designed and synthesized through a combination of dibenzothiophene, α-carboline, and carbazole (DTCC) moieties. The synthesized host material showed a sufficient HOMO/LUMO bandgap (3.49 eV) and triplet energy (2.67 eV) for green emitting bis[2-(2-pyridinyl-N)phenyl-C] (acetylacetonato) iridium(III) [Ir(ppy)₂(acac)]. From the results of a single charge device for DTCC, the hole current density of DTCC was similar to the electron current density, indicating that DTCC possesses bipolar charge transport properties, confirming its bipolar nature and thus its applicability as the host of PHOLED. Thus, the DTCC host showed efficient energy transfer to the Ir(ppy)₂(acac) dopant in the device. A maximum external quantum efficiency of 18.9% was obtained using DTCC as the host material and the color coordinate of the green PHOLED was (CIE_x,y = 0.34, 0.62) at 10% doping concentration.

Original language	English
Pages (from-to)	7-11
Number of pages	5
Journal	Synthetic Metals
Volume	213
DOIs	https://doi.org/10.1016/j.synthmet.2015.12.022
State	Published - Mar 2016

Keywords

Bipolar host
Carbazole
Dibenzothiophene
Green phosphorescence
α-Carboline

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10.1016/j.synthmet.2015.12.022

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@article{2d05e52c37f448efbd2149dc7ec68aa4,

title = "Synthesis of a dibenzothiophene/carboline/carbazole hybrid bipolar host material for green phosphorescent OLEDs",

abstract = "A bipolar host material for green phosphorescent organic light-emitting diodes (OLEDs) was designed and synthesized through a combination of dibenzothiophene, α-carboline, and carbazole (DTCC) moieties. The synthesized host material showed a sufficient HOMO/LUMO bandgap (3.49 eV) and triplet energy (2.67 eV) for green emitting bis[2-(2-pyridinyl-N)phenyl-C] (acetylacetonato) iridium(III) [Ir(ppy)2(acac)]. From the results of a single charge device for DTCC, the hole current density of DTCC was similar to the electron current density, indicating that DTCC possesses bipolar charge transport properties, confirming its bipolar nature and thus its applicability as the host of PHOLED. Thus, the DTCC host showed efficient energy transfer to the Ir(ppy)2(acac) dopant in the device. A maximum external quantum efficiency of 18.9\% was obtained using DTCC as the host material and the color coordinate of the green PHOLED was (CIEx,y = 0.34, 0.62) at 10\% doping concentration.",

keywords = "Bipolar host, Carbazole, Dibenzothiophene, Green phosphorescence, α-Carboline",

author = "Jun, \{Jin Woo\} and Lee, \{Kyung Mi\} and Kim, \{Oh Young\} and Lee, \{Jun Yeob\} and Hwang, \{Seok Ho\}",

year = "2016",

month = mar,

doi = "10.1016/j.synthmet.2015.12.022",

language = "English",

volume = "213",

pages = "7--11",

journal = "Synthetic Metals",

issn = "0379-6779",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Synthesis of a dibenzothiophene/carboline/carbazole hybrid bipolar host material for green phosphorescent OLEDs

AU - Jun, Jin Woo

AU - Lee, Kyung Mi

AU - Kim, Oh Young

AU - Lee, Jun Yeob

AU - Hwang, Seok Ho

PY - 2016/3

Y1 - 2016/3

N2 - A bipolar host material for green phosphorescent organic light-emitting diodes (OLEDs) was designed and synthesized through a combination of dibenzothiophene, α-carboline, and carbazole (DTCC) moieties. The synthesized host material showed a sufficient HOMO/LUMO bandgap (3.49 eV) and triplet energy (2.67 eV) for green emitting bis[2-(2-pyridinyl-N)phenyl-C] (acetylacetonato) iridium(III) [Ir(ppy)2(acac)]. From the results of a single charge device for DTCC, the hole current density of DTCC was similar to the electron current density, indicating that DTCC possesses bipolar charge transport properties, confirming its bipolar nature and thus its applicability as the host of PHOLED. Thus, the DTCC host showed efficient energy transfer to the Ir(ppy)2(acac) dopant in the device. A maximum external quantum efficiency of 18.9% was obtained using DTCC as the host material and the color coordinate of the green PHOLED was (CIEx,y = 0.34, 0.62) at 10% doping concentration.

AB - A bipolar host material for green phosphorescent organic light-emitting diodes (OLEDs) was designed and synthesized through a combination of dibenzothiophene, α-carboline, and carbazole (DTCC) moieties. The synthesized host material showed a sufficient HOMO/LUMO bandgap (3.49 eV) and triplet energy (2.67 eV) for green emitting bis[2-(2-pyridinyl-N)phenyl-C] (acetylacetonato) iridium(III) [Ir(ppy)2(acac)]. From the results of a single charge device for DTCC, the hole current density of DTCC was similar to the electron current density, indicating that DTCC possesses bipolar charge transport properties, confirming its bipolar nature and thus its applicability as the host of PHOLED. Thus, the DTCC host showed efficient energy transfer to the Ir(ppy)2(acac) dopant in the device. A maximum external quantum efficiency of 18.9% was obtained using DTCC as the host material and the color coordinate of the green PHOLED was (CIEx,y = 0.34, 0.62) at 10% doping concentration.

KW - Bipolar host

KW - Carbazole

KW - Dibenzothiophene

KW - Green phosphorescence

KW - α-Carboline

UR - https://www.scopus.com/pages/publications/84953807062

U2 - 10.1016/j.synthmet.2015.12.022

DO - 10.1016/j.synthmet.2015.12.022

M3 - Article

AN - SCOPUS:84953807062

SN - 0379-6779

VL - 213

SP - 7

EP - 11

JO - Synthetic Metals

JF - Synthetic Metals

ER -

Synthesis of a dibenzothiophene/carboline/carbazole hybrid bipolar host material for green phosphorescent OLEDs

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Keywords

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