Phosphorescence quantum efficiency and intermolecular interaction of iridium(III) complexes in co-deposited films with organic semiconducting hosts

Yuichiro Kawamura, Kenichi Goshi, Jason Brooks, Julie J. Brown, Hiroyuki Sasabe, Chihaya Adachi

Research output: Contribution to journalConference article

Abstract

We accurately measured the absolute photoluminescence (PL) quantum efficiency (ηPL) of organic solid-state thin films by using an integrating sphere. We measured the ηPL of conventional organic materials used in organic light emitting diodes, such as a tris (8-quinolionolato)aluminum(III) complex (Alq3), and a phosphorescent 1.5mol%-fac-tris(2-phenylpyridyl)iridium(III):4,4'-bis(carbazol-9-yl)-2, 2'-biphenyl [Ir(ppy)3:CBP] co-deposited film. Alq3 and Ir(ppy)3:CBP showed a ηPL = 20±1% and 97 ± 2%, which corresponded well to external electroluminescence efficiency using these materials. We also measured red emitting bis[2-(2'-benzothienyl) pyridinato-N,C3] (acetylacetonato) iridium(III) [Btp 2Ir(acac)] with CBP, and the blue complex, bis[(4,6-difluorophenyl) pyridinato -N,C2](picolinato)iridium(III) [FIrpic], with m-bis(N-carbazolyl)benzene. The maximum ηPL values for Btp 2Ir(acac), and FIrpic were 51±1% (at 1.4mol%), and 99±1% (1.2mol%), respectively. These results suggest that the ηEL of red phosphorescent OLEDs using Btp2Ir(acac) as the dopant can be as high as 10%, and blue devices using FIrpic can reach the theoretical limit of 20%.

Original languageEnglish
Article numberDD4.5
Pages (from-to)73-78
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume846
Publication statusPublished - Aug 25 2005
Event2004 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 29 2004Dec 1 2004

Fingerprint

Iridium
Phosphorescence
phosphorescence
iridium
Quantum efficiency
quantum efficiency
Photoluminescence
photoluminescence
Organic light emitting diodes (OLED)
interactions
organic solids
Electroluminescence
organic materials
Benzene
Aluminum
electroluminescence
light emitting diodes
benzene
Doping (additives)
solid state

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Phosphorescence quantum efficiency and intermolecular interaction of iridium(III) complexes in co-deposited films with organic semiconducting hosts. / Kawamura, Yuichiro; Goshi, Kenichi; Brooks, Jason; Brown, Julie J.; Sasabe, Hiroyuki; Adachi, Chihaya.

In: Materials Research Society Symposium Proceedings, Vol. 846, DD4.5, 25.08.2005, p. 73-78.

Research output: Contribution to journalConference article

@article{153e8c97428449179514a85864f013a9,
title = "Phosphorescence quantum efficiency and intermolecular interaction of iridium(III) complexes in co-deposited films with organic semiconducting hosts",
abstract = "We accurately measured the absolute photoluminescence (PL) quantum efficiency (ηPL) of organic solid-state thin films by using an integrating sphere. We measured the ηPL of conventional organic materials used in organic light emitting diodes, such as a tris (8-quinolionolato)aluminum(III) complex (Alq3), and a phosphorescent 1.5mol{\%}-fac-tris(2-phenylpyridyl)iridium(III):4,4'-bis(carbazol-9-yl)-2, 2'-biphenyl [Ir(ppy)3:CBP] co-deposited film. Alq3 and Ir(ppy)3:CBP showed a ηPL = 20±1{\%} and 97 ± 2{\%}, which corresponded well to external electroluminescence efficiency using these materials. We also measured red emitting bis[2-(2'-benzothienyl) pyridinato-N,C3] (acetylacetonato) iridium(III) [Btp 2Ir(acac)] with CBP, and the blue complex, bis[(4,6-difluorophenyl) pyridinato -N,C2](picolinato)iridium(III) [FIrpic], with m-bis(N-carbazolyl)benzene. The maximum ηPL values for Btp 2Ir(acac), and FIrpic were 51±1{\%} (at 1.4mol{\%}), and 99±1{\%} (1.2mol{\%}), respectively. These results suggest that the ηEL of red phosphorescent OLEDs using Btp2Ir(acac) as the dopant can be as high as 10{\%}, and blue devices using FIrpic can reach the theoretical limit of 20{\%}.",
author = "Yuichiro Kawamura and Kenichi Goshi and Jason Brooks and Brown, {Julie J.} and Hiroyuki Sasabe and Chihaya Adachi",
year = "2005",
month = "8",
day = "25",
language = "English",
volume = "846",
pages = "73--78",
journal = "Materials Research Society Symposium - Proceedings",
issn = "0272-9172",
publisher = "Materials Research Society",

}

TY - JOUR

T1 - Phosphorescence quantum efficiency and intermolecular interaction of iridium(III) complexes in co-deposited films with organic semiconducting hosts

AU - Kawamura, Yuichiro

AU - Goshi, Kenichi

AU - Brooks, Jason

AU - Brown, Julie J.

AU - Sasabe, Hiroyuki

AU - Adachi, Chihaya

PY - 2005/8/25

Y1 - 2005/8/25

N2 - We accurately measured the absolute photoluminescence (PL) quantum efficiency (ηPL) of organic solid-state thin films by using an integrating sphere. We measured the ηPL of conventional organic materials used in organic light emitting diodes, such as a tris (8-quinolionolato)aluminum(III) complex (Alq3), and a phosphorescent 1.5mol%-fac-tris(2-phenylpyridyl)iridium(III):4,4'-bis(carbazol-9-yl)-2, 2'-biphenyl [Ir(ppy)3:CBP] co-deposited film. Alq3 and Ir(ppy)3:CBP showed a ηPL = 20±1% and 97 ± 2%, which corresponded well to external electroluminescence efficiency using these materials. We also measured red emitting bis[2-(2'-benzothienyl) pyridinato-N,C3] (acetylacetonato) iridium(III) [Btp 2Ir(acac)] with CBP, and the blue complex, bis[(4,6-difluorophenyl) pyridinato -N,C2](picolinato)iridium(III) [FIrpic], with m-bis(N-carbazolyl)benzene. The maximum ηPL values for Btp 2Ir(acac), and FIrpic were 51±1% (at 1.4mol%), and 99±1% (1.2mol%), respectively. These results suggest that the ηEL of red phosphorescent OLEDs using Btp2Ir(acac) as the dopant can be as high as 10%, and blue devices using FIrpic can reach the theoretical limit of 20%.

AB - We accurately measured the absolute photoluminescence (PL) quantum efficiency (ηPL) of organic solid-state thin films by using an integrating sphere. We measured the ηPL of conventional organic materials used in organic light emitting diodes, such as a tris (8-quinolionolato)aluminum(III) complex (Alq3), and a phosphorescent 1.5mol%-fac-tris(2-phenylpyridyl)iridium(III):4,4'-bis(carbazol-9-yl)-2, 2'-biphenyl [Ir(ppy)3:CBP] co-deposited film. Alq3 and Ir(ppy)3:CBP showed a ηPL = 20±1% and 97 ± 2%, which corresponded well to external electroluminescence efficiency using these materials. We also measured red emitting bis[2-(2'-benzothienyl) pyridinato-N,C3] (acetylacetonato) iridium(III) [Btp 2Ir(acac)] with CBP, and the blue complex, bis[(4,6-difluorophenyl) pyridinato -N,C2](picolinato)iridium(III) [FIrpic], with m-bis(N-carbazolyl)benzene. The maximum ηPL values for Btp 2Ir(acac), and FIrpic were 51±1% (at 1.4mol%), and 99±1% (1.2mol%), respectively. These results suggest that the ηEL of red phosphorescent OLEDs using Btp2Ir(acac) as the dopant can be as high as 10%, and blue devices using FIrpic can reach the theoretical limit of 20%.

UR - http://www.scopus.com/inward/record.url?scp=23844480385&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=23844480385&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:23844480385

VL - 846

SP - 73

EP - 78

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

SN - 0272-9172

M1 - DD4.5

ER -