Reduced efficiency roll-off in highly efficient and color-stable hybrid WOLEDs: The influence of triplet transfer and charge-transport behavior on enhancing device performance

Qi Wang; Cheuk Lam Ho; Yongbiao Zhao; Dongge Ma; Wai Yeung Wong; Lixiang Wang

doi:10.1016/j.orgel.2009.11.001

Reduced efficiency roll-off in highly efficient and color-stable hybrid WOLEDs: The influence of triplet transfer and charge-transport behavior on enhancing device performance

Qi Wang, Cheuk Lam Ho, Yongbiao Zhao, Dongge Ma^*, Wai Yeung Wong, Lixiang Wang

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

79 Citations (Scopus)

Abstract

By wisely utilizing combinations of exciton-managed orange-phosphorescence/sky blue-fluorescence, we report on high-efficiency white organic light-emitting diodes (WOLEDs) with high color-stability together with reduced efficiency roll-off. Two WOLEDs with the peak current efficiencies of 34.5 and 42.5 cd A^-1 which slightly shift to 34.2 and 40.0 cd A^-1 at 1000 cd m^-2 are demonstrated. Systematic investigations focused on the effects of hole-injection buffer layer, thickness of emitting-layer (EML) and the stepwise-doping profile of orange phosphorescent EML on the device performance have been performed. It is evidently shown that careful management of the triplet/singlet excitons and charge-carriers is key to realizing such high performance of the devices. The results will beyond doubt be helpful to the design of both material and device structure for high-performance WOLEDs and next-generation solid-state lighting sources.

Original language	English
Pages (from-to)	238-246
Number of pages	9
Journal	Organic Electronics
Volume	11
Issue number	2
DOIs	https://doi.org/10.1016/j.orgel.2009.11.001
Publication status	Published - Feb 2010

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Biomaterials
Chemistry(all)
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

User-Defined Keywords

Carbazole
Iridium complexes
Organic light-emitting diodes
Triplet emission
White light

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10.1016/j.orgel.2009.11.001

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@article{c4c27bf2cfe34f8e82a45243d1b0382d,

title = "Reduced efficiency roll-off in highly efficient and color-stable hybrid WOLEDs: The influence of triplet transfer and charge-transport behavior on enhancing device performance",

abstract = "By wisely utilizing combinations of exciton-managed orange-phosphorescence/sky blue-fluorescence, we report on high-efficiency white organic light-emitting diodes (WOLEDs) with high color-stability together with reduced efficiency roll-off. Two WOLEDs with the peak current efficiencies of 34.5 and 42.5 cd A-1 which slightly shift to 34.2 and 40.0 cd A-1 at 1000 cd m-2 are demonstrated. Systematic investigations focused on the effects of hole-injection buffer layer, thickness of emitting-layer (EML) and the stepwise-doping profile of orange phosphorescent EML on the device performance have been performed. It is evidently shown that careful management of the triplet/singlet excitons and charge-carriers is key to realizing such high performance of the devices. The results will beyond doubt be helpful to the design of both material and device structure for high-performance WOLEDs and next-generation solid-state lighting sources.",

keywords = "Carbazole, Iridium complexes, Organic light-emitting diodes, Triplet emission, White light",

author = "Qi Wang and Ho, {Cheuk Lam} and Yongbiao Zhao and Dongge Ma and Wong, {Wai Yeung} and Lixiang Wang",

note = "Funding Information: The authors thank the Foundation of Jilin Research Council ( 20080337 ), Foundation of Changchun Research Council ( 2007GH06 ), Science Fund for Creative Research Groups of NSFC ( 20621401 ) and Ministry of Science and Technology of China (863 Program No. 2006AA03A161 , 973 Program Nos. 2009CB930603 , 2009CB623604 ) for the support of this research. L.W. thanks NSFC ( 50633040 ) for financial support. W.-Y.W. thanks the Hong Kong Research Grants Council ( HKBU 202106 ) and the Hong Kong Baptist University ( FRG2/08-09/111 ) for financial support. C.-L. Ho is thankful for a postdoctoral fellowship from the Hong Kong Baptist University.",

year = "2010",

month = feb,

doi = "10.1016/j.orgel.2009.11.001",

language = "English",

volume = "11",

pages = "238--246",

journal = "Organic Electronics",

issn = "1566-1199",

publisher = "Elsevier BV",

number = "2",

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T2 - The influence of triplet transfer and charge-transport behavior on enhancing device performance

AU - Wang, Qi

AU - Ho, Cheuk Lam

AU - Zhao, Yongbiao

AU - Ma, Dongge

AU - Wong, Wai Yeung

AU - Wang, Lixiang

N1 - Funding Information: The authors thank the Foundation of Jilin Research Council ( 20080337 ), Foundation of Changchun Research Council ( 2007GH06 ), Science Fund for Creative Research Groups of NSFC ( 20621401 ) and Ministry of Science and Technology of China (863 Program No. 2006AA03A161 , 973 Program Nos. 2009CB930603 , 2009CB623604 ) for the support of this research. L.W. thanks NSFC ( 50633040 ) for financial support. W.-Y.W. thanks the Hong Kong Research Grants Council ( HKBU 202106 ) and the Hong Kong Baptist University ( FRG2/08-09/111 ) for financial support. C.-L. Ho is thankful for a postdoctoral fellowship from the Hong Kong Baptist University.

PY - 2010/2

Y1 - 2010/2

N2 - By wisely utilizing combinations of exciton-managed orange-phosphorescence/sky blue-fluorescence, we report on high-efficiency white organic light-emitting diodes (WOLEDs) with high color-stability together with reduced efficiency roll-off. Two WOLEDs with the peak current efficiencies of 34.5 and 42.5 cd A-1 which slightly shift to 34.2 and 40.0 cd A-1 at 1000 cd m-2 are demonstrated. Systematic investigations focused on the effects of hole-injection buffer layer, thickness of emitting-layer (EML) and the stepwise-doping profile of orange phosphorescent EML on the device performance have been performed. It is evidently shown that careful management of the triplet/singlet excitons and charge-carriers is key to realizing such high performance of the devices. The results will beyond doubt be helpful to the design of both material and device structure for high-performance WOLEDs and next-generation solid-state lighting sources.

AB - By wisely utilizing combinations of exciton-managed orange-phosphorescence/sky blue-fluorescence, we report on high-efficiency white organic light-emitting diodes (WOLEDs) with high color-stability together with reduced efficiency roll-off. Two WOLEDs with the peak current efficiencies of 34.5 and 42.5 cd A-1 which slightly shift to 34.2 and 40.0 cd A-1 at 1000 cd m-2 are demonstrated. Systematic investigations focused on the effects of hole-injection buffer layer, thickness of emitting-layer (EML) and the stepwise-doping profile of orange phosphorescent EML on the device performance have been performed. It is evidently shown that careful management of the triplet/singlet excitons and charge-carriers is key to realizing such high performance of the devices. The results will beyond doubt be helpful to the design of both material and device structure for high-performance WOLEDs and next-generation solid-state lighting sources.

KW - Carbazole

KW - Iridium complexes

KW - Organic light-emitting diodes

KW - Triplet emission

KW - White light

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JO - Organic Electronics

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Reduced efficiency roll-off in highly efficient and color-stable hybrid WOLEDs: The influence of triplet transfer and charge-transport behavior on enhancing device performance

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