A highly efficient wide-band-gap host material for blue electrophosphorescent light-emitting devices

Dong Ryeol Whang; Youngmin You; Se Hun Kim; Won Ik Jeong; Young Seo Park; Jang Joo Kim; Soo Young Park

doi:10.1063/1.2821116

A highly efficient wide-band-gap host material for blue electrophosphorescent light-emitting devices

Dong Ryeol Whang, Youngmin You, Se Hun Kim, Won Ik Jeong, Young Seo Park, Jang Joo Kim, Soo Young Park

Department of Chemical Engineering & Materials Science

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

49 Scopus citations

Abstract

We report on an efficient wide-band-gap host material for blue electrophosphorescence devices, namely, 1,2-trans-di-9-carbazolylcyclobutane (DCz). Photophysical studies show that lower-energy excimer formation between the carbazole units can be efficiently suppressed in a DCz film, thus maintaining its high triplet-state energy and inducing an exothermic energy transfer from DCz to iridium(III)bis[(4,6-difluorophenyl)-pyridinato- N, C2′] picolinate (FIrpic). Electrophosphorescent devices comprising a FIrpic:DCz emitting layer exhibit a superior performance with a maximum external quantum efficiency of 9.8%, a maximum luminance efficiency of 21.5 cdA, and a maximum power efficiency of 15.0 lmW at 0.01 mA cm2.

Original language	English
Article number	233501
Journal	Applied Physics Letters
Volume	91
Issue number	23
DOIs	https://doi.org/10.1063/1.2821116
State	Published - 2007

Bibliographical note

Funding Information:
This work was partly supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Laboratory Program funded by the Ministry of Science and Technology (No. 2006-03246), and by Dongwoo FineChem Co.

Access to Document

10.1063/1.2821116

Cite this

@article{5cdb0e33e009432fa02da4eb939b10f3,

title = "A highly efficient wide-band-gap host material for blue electrophosphorescent light-emitting devices",

abstract = "We report on an efficient wide-band-gap host material for blue electrophosphorescence devices, namely, 1,2-trans-di-9-carbazolylcyclobutane (DCz). Photophysical studies show that lower-energy excimer formation between the carbazole units can be efficiently suppressed in a DCz film, thus maintaining its high triplet-state energy and inducing an exothermic energy transfer from DCz to iridium(III)bis[(4,6-difluorophenyl)-pyridinato- N, C2′] picolinate (FIrpic). Electrophosphorescent devices comprising a FIrpic:DCz emitting layer exhibit a superior performance with a maximum external quantum efficiency of 9.8%, a maximum luminance efficiency of 21.5 cdA, and a maximum power efficiency of 15.0 lmW at 0.01 mA cm2.",

author = "Whang, {Dong Ryeol} and Youngmin You and Kim, {Se Hun} and Jeong, {Won Ik} and Park, {Young Seo} and Kim, {Jang Joo} and Park, {Soo Young}",

note = "Funding Information: This work was partly supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Laboratory Program funded by the Ministry of Science and Technology (No. 2006-03246), and by Dongwoo FineChem Co.",

year = "2007",

doi = "10.1063/1.2821116",

language = "English",

volume = "91",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "23",

}

TY - JOUR

T1 - A highly efficient wide-band-gap host material for blue electrophosphorescent light-emitting devices

AU - Whang, Dong Ryeol

AU - You, Youngmin

AU - Kim, Se Hun

AU - Jeong, Won Ik

AU - Park, Young Seo

AU - Kim, Jang Joo

AU - Park, Soo Young

N1 - Funding Information: This work was partly supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Laboratory Program funded by the Ministry of Science and Technology (No. 2006-03246), and by Dongwoo FineChem Co.

PY - 2007

Y1 - 2007

N2 - We report on an efficient wide-band-gap host material for blue electrophosphorescence devices, namely, 1,2-trans-di-9-carbazolylcyclobutane (DCz). Photophysical studies show that lower-energy excimer formation between the carbazole units can be efficiently suppressed in a DCz film, thus maintaining its high triplet-state energy and inducing an exothermic energy transfer from DCz to iridium(III)bis[(4,6-difluorophenyl)-pyridinato- N, C2′] picolinate (FIrpic). Electrophosphorescent devices comprising a FIrpic:DCz emitting layer exhibit a superior performance with a maximum external quantum efficiency of 9.8%, a maximum luminance efficiency of 21.5 cdA, and a maximum power efficiency of 15.0 lmW at 0.01 mA cm2.

AB - We report on an efficient wide-band-gap host material for blue electrophosphorescence devices, namely, 1,2-trans-di-9-carbazolylcyclobutane (DCz). Photophysical studies show that lower-energy excimer formation between the carbazole units can be efficiently suppressed in a DCz film, thus maintaining its high triplet-state energy and inducing an exothermic energy transfer from DCz to iridium(III)bis[(4,6-difluorophenyl)-pyridinato- N, C2′] picolinate (FIrpic). Electrophosphorescent devices comprising a FIrpic:DCz emitting layer exhibit a superior performance with a maximum external quantum efficiency of 9.8%, a maximum luminance efficiency of 21.5 cdA, and a maximum power efficiency of 15.0 lmW at 0.01 mA cm2.

UR - http://www.scopus.com/inward/record.url?scp=36849064660&partnerID=8YFLogxK

U2 - 10.1063/1.2821116

DO - 10.1063/1.2821116

M3 - Article

AN - SCOPUS:36849064660

SN - 0003-6951

VL - 91

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 23

M1 - 233501

ER -

A highly efficient wide-band-gap host material for blue electrophosphorescent light-emitting devices

Abstract

Bibliographical note

Access to Document

Fingerprint

Cite this