Improving efficiency roll-off in organic light emitting devices with a fluorescence-interlayer-phosphorescence emission architecture

Tianhang Zheng; Wallace C.H. Choy; Cheuk Lam Ho; Wai Yeung Wong

doi:10.1063/1.3241079

Improving efficiency roll-off in organic light emitting devices with a fluorescence-interlayer-phosphorescence emission architecture

Tianhang Zheng, Wallace C.H. Choy, Cheuk Lam Ho, Wai Yeung Wong

Department of Chemistry

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

28 Citations (Scopus)

Abstract

Organic light emitting devices (OLEDs) with a fluorescence-interlayer- phosphorescence emission layer structure (FIP EML) has been proposed to solve the efficiency roll-off issue effectively. Efficient green OLED based on FIP EML exhibiting only 26% roll-off in the luminance efficiency, which is lower than the typical roll-off of 51% for conventional phosphorescent OLEDs with single EML operated at 5-150 mA/cm² range, has been demonstrated. Such enhancement should be attributed to the improved carrier balance, the exciton redistribution in recombination zone, the suppression of nonradiative exciton quenching processes, and the elimination of energy transfer loss offered by the FIP EML structure.

Original language	English
Article number	133304
Journal	Applied Physics Letters
Volume	95
Issue number	13
DOIs	https://doi.org/10.1063/1.3241079
Publication status	Published - 2009

Scopus Subject Areas

Physics and Astronomy (miscellaneous)

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title = "Improving efficiency roll-off in organic light emitting devices with a fluorescence-interlayer-phosphorescence emission architecture",

abstract = "Organic light emitting devices (OLEDs) with a fluorescence-interlayer- phosphorescence emission layer structure (FIP EML) has been proposed to solve the efficiency roll-off issue effectively. Efficient green OLED based on FIP EML exhibiting only 26% roll-off in the luminance efficiency, which is lower than the typical roll-off of 51% for conventional phosphorescent OLEDs with single EML operated at 5-150 mA/cm2 range, has been demonstrated. Such enhancement should be attributed to the improved carrier balance, the exciton redistribution in recombination zone, the suppression of nonradiative exciton quenching processes, and the elimination of energy transfer loss offered by the FIP EML structure.",

author = "Tianhang Zheng and Choy, {Wallace C.H.} and Ho, {Cheuk Lam} and Wong, {Wai Yeung}",

note = "Funding Information: This work is supported under Grant No. HKU 712108 from the Research Grants Council of the HK Special Administrative Region, China. W.-Y.W. thanks the Hong Kong Research Grants Council (Grant No. HKBU 202106) and the Hong Kong Baptist University (Grant No. FRG2/08-09/111) for financial support. We would like to thank Xiaoming He for the measurements of photophysical properties of organic semiconductors.",

year = "2009",

doi = "10.1063/1.3241079",

language = "English",

volume = "95",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "13",

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T1 - Improving efficiency roll-off in organic light emitting devices with a fluorescence-interlayer-phosphorescence emission architecture

AU - Zheng, Tianhang

AU - Choy, Wallace C.H.

AU - Ho, Cheuk Lam

AU - Wong, Wai Yeung

N1 - Funding Information: This work is supported under Grant No. HKU 712108 from the Research Grants Council of the HK Special Administrative Region, China. W.-Y.W. thanks the Hong Kong Research Grants Council (Grant No. HKBU 202106) and the Hong Kong Baptist University (Grant No. FRG2/08-09/111) for financial support. We would like to thank Xiaoming He for the measurements of photophysical properties of organic semiconductors.

PY - 2009

Y1 - 2009

N2 - Organic light emitting devices (OLEDs) with a fluorescence-interlayer- phosphorescence emission layer structure (FIP EML) has been proposed to solve the efficiency roll-off issue effectively. Efficient green OLED based on FIP EML exhibiting only 26% roll-off in the luminance efficiency, which is lower than the typical roll-off of 51% for conventional phosphorescent OLEDs with single EML operated at 5-150 mA/cm2 range, has been demonstrated. Such enhancement should be attributed to the improved carrier balance, the exciton redistribution in recombination zone, the suppression of nonradiative exciton quenching processes, and the elimination of energy transfer loss offered by the FIP EML structure.

AB - Organic light emitting devices (OLEDs) with a fluorescence-interlayer- phosphorescence emission layer structure (FIP EML) has been proposed to solve the efficiency roll-off issue effectively. Efficient green OLED based on FIP EML exhibiting only 26% roll-off in the luminance efficiency, which is lower than the typical roll-off of 51% for conventional phosphorescent OLEDs with single EML operated at 5-150 mA/cm2 range, has been demonstrated. Such enhancement should be attributed to the improved carrier balance, the exciton redistribution in recombination zone, the suppression of nonradiative exciton quenching processes, and the elimination of energy transfer loss offered by the FIP EML structure.

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U2 - 10.1063/1.3241079

DO - 10.1063/1.3241079

M3 - Journal article

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VL - 95

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 13

M1 - 133304

ER -

Improving efficiency roll-off in organic light emitting devices with a fluorescence-interlayer-phosphorescence emission architecture

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