Enhanced electroluminescence efficiency of phosphorescent organic light-emitting diodes by controlling the triplet energy of the hole-blocking layer

Young Wook Park; Young Min Kim; Jin Hwan Choi; Tae Hyun Park; Jin Wook Jeong; Hyun Ju Choi; Byeong Kwon Ju

doi:10.1109/LED.2010.2041891

Enhanced electroluminescence efficiency of phosphorescent organic light-emitting diodes by controlling the triplet energy of the hole-blocking layer

Young Wook Park, Young Min Kim, Jin Hwan Choi, Tae Hyun Park, Jin Wook Jeong, Hyun Ju Choi, Byeong Kwon Ju

School of Electrical Engineering

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

4 Citations (Scopus)

Abstract

This letter reports on the effect of the triplet energy (E_T) of the hole-blocking layer (HBL) on triplet exciton quenching between the emissive layer (EML) host and the HBL of phosphorescent organic light-emitting diodes (PHOLEDs). Using different EML hosts and HBLs having different E_T's and electron mobilities, the effects of the E_T's of the HBL have been analyzed. When the E_Tof the HBL is lower than that of the EML host, the PHOLEDs show significant dependence of reduced device performances. PHOLEDs having a 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole HBL show 65% improved external quantum efficiency (EQE) at 500 cd/m²with a 4, 4'4,-tris(N-carbazolyl)-triphenyl-amine host than that with an N,N-dicarbazolyl-4-4-biphenyl host, while PHOLEDs having a 2,9-dimethyl-4,7- diphenyl-1,10-phenanthroline HBL show 41% reduced EQE. To solve the remaining key issue of developing highly efficient PHOLEDs, the E_Tof matching the EML and the HBL is extremely desirable and is also explored.

Original language	English
Article number	5430929
Pages (from-to)	452-454
Number of pages	3
Journal	IEEE Electron Device Letters
Volume	31
Issue number	5
DOIs	https://doi.org/10.1109/LED.2010.2041891
Publication status	Published - 2010 May

Bibliographical note

Funding Information:
Manuscript received October 6, 2009; revised January 19, 2010. Date of publication March 15, 2010; date of current version April 23, 2010. This work was supported in part by the Korean Science and Engineering Foundation under Grant R11-2007-045-01003-0 funded by the Korean Ministry of Education, Science and Technology (MEST), by World Class University Project R32-2008-000-10082-0 of MEST, and by the IT R&D program of MKE/IITA (2009-F-017-01, Development of Fundamental Technologies for Flexible Combined-Function Organic Electronic Device). The review of this letter was arranged by Editor C. Jagadish.

Keywords

Phosphorescent organic light-emitting diodes (PHOLEDs)
Triplet energy of hole-blocking layer (HBL)
Triplet quenching

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/LED.2010.2041891

Cite this

@article{be8df89f7dcc4b87abce5f2b2684ce12,

title = "Enhanced electroluminescence efficiency of phosphorescent organic light-emitting diodes by controlling the triplet energy of the hole-blocking layer",

abstract = "This letter reports on the effect of the triplet energy (ET) of the hole-blocking layer (HBL) on triplet exciton quenching between the emissive layer (EML) host and the HBL of phosphorescent organic light-emitting diodes (PHOLEDs). Using different EML hosts and HBLs having different ET's and electron mobilities, the effects of the ET's of the HBL have been analyzed. When the ETof the HBL is lower than that of the EML host, the PHOLEDs show significant dependence of reduced device performances. PHOLEDs having a 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole HBL show 65% improved external quantum efficiency (EQE) at 500 cd/m2with a 4, 4'4,-tris(N-carbazolyl)-triphenyl-amine host than that with an N,N-dicarbazolyl-4-4-biphenyl host, while PHOLEDs having a 2,9-dimethyl-4,7- diphenyl-1,10-phenanthroline HBL show 41% reduced EQE. To solve the remaining key issue of developing highly efficient PHOLEDs, the ETof matching the EML and the HBL is extremely desirable and is also explored.",

keywords = "Phosphorescent organic light-emitting diodes (PHOLEDs), Triplet energy of hole-blocking layer (HBL), Triplet quenching",

author = "Park, {Young Wook} and Kim, {Young Min} and Choi, {Jin Hwan} and Park, {Tae Hyun} and Jeong, {Jin Wook} and Choi, {Hyun Ju} and Ju, {Byeong Kwon}",

note = "Funding Information: Manuscript received October 6, 2009; revised January 19, 2010. Date of publication March 15, 2010; date of current version April 23, 2010. This work was supported in part by the Korean Science and Engineering Foundation under Grant R11-2007-045-01003-0 funded by the Korean Ministry of Education, Science and Technology (MEST), by World Class University Project R32-2008-000-10082-0 of MEST, and by the IT R&D program of MKE/IITA (2009-F-017-01, Development of Fundamental Technologies for Flexible Combined-Function Organic Electronic Device). The review of this letter was arranged by Editor C. Jagadish.",

year = "2010",

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doi = "10.1109/LED.2010.2041891",

language = "English",

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AU - Choi, Jin Hwan

AU - Park, Tae Hyun

AU - Jeong, Jin Wook

AU - Choi, Hyun Ju

AU - Ju, Byeong Kwon

N1 - Funding Information: Manuscript received October 6, 2009; revised January 19, 2010. Date of publication March 15, 2010; date of current version April 23, 2010. This work was supported in part by the Korean Science and Engineering Foundation under Grant R11-2007-045-01003-0 funded by the Korean Ministry of Education, Science and Technology (MEST), by World Class University Project R32-2008-000-10082-0 of MEST, and by the IT R&D program of MKE/IITA (2009-F-017-01, Development of Fundamental Technologies for Flexible Combined-Function Organic Electronic Device). The review of this letter was arranged by Editor C. Jagadish.

PY - 2010/5

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N2 - This letter reports on the effect of the triplet energy (ET) of the hole-blocking layer (HBL) on triplet exciton quenching between the emissive layer (EML) host and the HBL of phosphorescent organic light-emitting diodes (PHOLEDs). Using different EML hosts and HBLs having different ET's and electron mobilities, the effects of the ET's of the HBL have been analyzed. When the ETof the HBL is lower than that of the EML host, the PHOLEDs show significant dependence of reduced device performances. PHOLEDs having a 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole HBL show 65% improved external quantum efficiency (EQE) at 500 cd/m2with a 4, 4'4,-tris(N-carbazolyl)-triphenyl-amine host than that with an N,N-dicarbazolyl-4-4-biphenyl host, while PHOLEDs having a 2,9-dimethyl-4,7- diphenyl-1,10-phenanthroline HBL show 41% reduced EQE. To solve the remaining key issue of developing highly efficient PHOLEDs, the ETof matching the EML and the HBL is extremely desirable and is also explored.

AB - This letter reports on the effect of the triplet energy (ET) of the hole-blocking layer (HBL) on triplet exciton quenching between the emissive layer (EML) host and the HBL of phosphorescent organic light-emitting diodes (PHOLEDs). Using different EML hosts and HBLs having different ET's and electron mobilities, the effects of the ET's of the HBL have been analyzed. When the ETof the HBL is lower than that of the EML host, the PHOLEDs show significant dependence of reduced device performances. PHOLEDs having a 3-(4-biphenylyl)-4-phenyl-5-tert-butylphenyl-1,2,4-triazole HBL show 65% improved external quantum efficiency (EQE) at 500 cd/m2with a 4, 4'4,-tris(N-carbazolyl)-triphenyl-amine host than that with an N,N-dicarbazolyl-4-4-biphenyl host, while PHOLEDs having a 2,9-dimethyl-4,7- diphenyl-1,10-phenanthroline HBL show 41% reduced EQE. To solve the remaining key issue of developing highly efficient PHOLEDs, the ETof matching the EML and the HBL is extremely desirable and is also explored.

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KW - Triplet energy of hole-blocking layer (HBL)

KW - Triplet quenching

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Enhanced electroluminescence efficiency of phosphorescent organic light-emitting diodes by controlling the triplet energy of the hole-blocking layer

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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