Highly efficient solution-processed deep-red emitting heteroleptic thiophene-phenylquinoline based Ir(III) complexes for phosphorescent organic light-emitting diodes

Vijaya Gopalan Sree; Woosum Cho; Sungmin Shin; Taegyun Lee; Yeong Soon Gal; Myungkwan Song; Sung Ho Jin

doi:10.1016/j.dyepig.2017.01.004

Highly efficient solution-processed deep-red emitting heteroleptic thiophene-phenylquinoline based Ir(III) complexes for phosphorescent organic light-emitting diodes

Vijaya Gopalan Sree, Woosum Cho, Sungmin Shin, Taegyun Lee, Yeong Soon Gal, Myungkwan Song, Sung Ho Jin

Department of Physics

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

17 Scopus citations

Abstract

New series of cyclometalated iridium(III) complexes [(TPQ)₂Ir(pic), (TPQ)₂Ir(pic-N-O) and (TPQ)₂Ir(acac)] based on thiophene containing phenylquinoline main ligand (CˆN) and three different ancillary ligands (picolinic acid, picolinic acid-N-oxide and acetylacetone) have been synthesized. Synthesized Ir(III) complexes were characterized by ¹H NMR, ¹³C NMR, mass spectroscopy and their absorption, emission, cyclic voltammetry and electroluminescence properties were steadily investigated. Herein, (TPQ)₂Ir(pic-N-O) complex showed smaller singlet-triplet splitting energy and higher transition dipole moment from ground to excited state, thus making (TPQ)₂Ir(pic-N-O) complex, a good candidate as a phosphorescent emitter. Phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated using the Ir(III) complexes, [(TPQ)₂Ir(pic), (TPQ)₂Ir(pic-N-O) and (TPQ)₂Ir(acac)], as deep-red emitters and devices using (TPQ)₂Ir(-pic-N-O) achieved a maximum external quantum efficiency (EQE) of 15.42% and a current efficiency of 13.94 cd/A, whereas devices using (TPQ)₂Ir(acac) showed a more saturated/deep-red emission with a maximum EQE of 11.45%.

Original language	English
Pages (from-to)	779-787
Number of pages	9
Journal	Dyes and Pigments
Volume	139
DOIs	https://doi.org/10.1016/j.dyepig.2017.01.004
State	Published - 1 Apr 2017

Keywords

Cyclometalated iridium(III) complex
Deep-red emission
DFT
PhOLEDs
Solution-process

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10.1016/j.dyepig.2017.01.004

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@article{9140476e4b154869aa3d3463d34f4049,

title = "Highly efficient solution-processed deep-red emitting heteroleptic thiophene-phenylquinoline based Ir(III) complexes for phosphorescent organic light-emitting diodes",

abstract = "New series of cyclometalated iridium(III) complexes [(TPQ)2Ir(pic), (TPQ)2Ir(pic-N-O) and (TPQ)2Ir(acac)] based on thiophene containing phenylquinoline main ligand (CˆN) and three different ancillary ligands (picolinic acid, picolinic acid-N-oxide and acetylacetone) have been synthesized. Synthesized Ir(III) complexes were characterized by 1H NMR, 13C NMR, mass spectroscopy and their absorption, emission, cyclic voltammetry and electroluminescence properties were steadily investigated. Herein, (TPQ)2Ir(pic-N-O) complex showed smaller singlet-triplet splitting energy and higher transition dipole moment from ground to excited state, thus making (TPQ)2Ir(pic-N-O) complex, a good candidate as a phosphorescent emitter. Phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated using the Ir(III) complexes, [(TPQ)2Ir(pic), (TPQ)2Ir(pic-N-O) and (TPQ)2Ir(acac)], as deep-red emitters and devices using (TPQ)2Ir(-pic-N-O) achieved a maximum external quantum efficiency (EQE) of 15.42% and a current efficiency of 13.94 cd/A, whereas devices using (TPQ)2Ir(acac) showed a more saturated/deep-red emission with a maximum EQE of 11.45%.",

keywords = "Cyclometalated iridium(III) complex, Deep-red emission, DFT, PhOLEDs, Solution-process",

author = "Sree, {Vijaya Gopalan} and Woosum Cho and Sungmin Shin and Taegyun Lee and Gal, {Yeong Soon} and Myungkwan Song and Jin, {Sung Ho}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = apr,

day = "1",

doi = "10.1016/j.dyepig.2017.01.004",

language = "English",

volume = "139",

pages = "779--787",

journal = "Dyes and Pigments",

issn = "0143-7208",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Highly efficient solution-processed deep-red emitting heteroleptic thiophene-phenylquinoline based Ir(III) complexes for phosphorescent organic light-emitting diodes

AU - Sree, Vijaya Gopalan

AU - Cho, Woosum

AU - Shin, Sungmin

AU - Lee, Taegyun

AU - Gal, Yeong Soon

AU - Song, Myungkwan

AU - Jin, Sung Ho

PY - 2017/4/1

Y1 - 2017/4/1

N2 - New series of cyclometalated iridium(III) complexes [(TPQ)2Ir(pic), (TPQ)2Ir(pic-N-O) and (TPQ)2Ir(acac)] based on thiophene containing phenylquinoline main ligand (CˆN) and three different ancillary ligands (picolinic acid, picolinic acid-N-oxide and acetylacetone) have been synthesized. Synthesized Ir(III) complexes were characterized by 1H NMR, 13C NMR, mass spectroscopy and their absorption, emission, cyclic voltammetry and electroluminescence properties were steadily investigated. Herein, (TPQ)2Ir(pic-N-O) complex showed smaller singlet-triplet splitting energy and higher transition dipole moment from ground to excited state, thus making (TPQ)2Ir(pic-N-O) complex, a good candidate as a phosphorescent emitter. Phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated using the Ir(III) complexes, [(TPQ)2Ir(pic), (TPQ)2Ir(pic-N-O) and (TPQ)2Ir(acac)], as deep-red emitters and devices using (TPQ)2Ir(-pic-N-O) achieved a maximum external quantum efficiency (EQE) of 15.42% and a current efficiency of 13.94 cd/A, whereas devices using (TPQ)2Ir(acac) showed a more saturated/deep-red emission with a maximum EQE of 11.45%.

AB - New series of cyclometalated iridium(III) complexes [(TPQ)2Ir(pic), (TPQ)2Ir(pic-N-O) and (TPQ)2Ir(acac)] based on thiophene containing phenylquinoline main ligand (CˆN) and three different ancillary ligands (picolinic acid, picolinic acid-N-oxide and acetylacetone) have been synthesized. Synthesized Ir(III) complexes were characterized by 1H NMR, 13C NMR, mass spectroscopy and their absorption, emission, cyclic voltammetry and electroluminescence properties were steadily investigated. Herein, (TPQ)2Ir(pic-N-O) complex showed smaller singlet-triplet splitting energy and higher transition dipole moment from ground to excited state, thus making (TPQ)2Ir(pic-N-O) complex, a good candidate as a phosphorescent emitter. Phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated using the Ir(III) complexes, [(TPQ)2Ir(pic), (TPQ)2Ir(pic-N-O) and (TPQ)2Ir(acac)], as deep-red emitters and devices using (TPQ)2Ir(-pic-N-O) achieved a maximum external quantum efficiency (EQE) of 15.42% and a current efficiency of 13.94 cd/A, whereas devices using (TPQ)2Ir(acac) showed a more saturated/deep-red emission with a maximum EQE of 11.45%.

KW - Cyclometalated iridium(III) complex

KW - Deep-red emission

KW - DFT

KW - PhOLEDs

KW - Solution-process

UR - http://www.scopus.com/inward/record.url?scp=85009179763&partnerID=8YFLogxK

U2 - 10.1016/j.dyepig.2017.01.004

DO - 10.1016/j.dyepig.2017.01.004

M3 - Article

AN - SCOPUS:85009179763

SN - 0143-7208

VL - 139

SP - 779

EP - 787

JO - Dyes and Pigments

JF - Dyes and Pigments

ER -

Highly efficient solution-processed deep-red emitting heteroleptic thiophene-phenylquinoline based Ir(III) complexes for phosphorescent organic light-emitting diodes

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Keywords

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