Nano-arrayed OLEDs: Enhanced outcoupling efficiency and suppressed efficiency roll-off

Ha Hwang; Yong Sub Shim; Junhee Choi; Dong Jun Lee; Jae Geun Kim; Ju Sung Lee; Young Wook Park; Byeong Kwon Ju

doi:10.1039/c8nr03198c

Nano-arrayed OLEDs: Enhanced outcoupling efficiency and suppressed efficiency roll-off

Ha Hwang, Yong Sub Shim, Junhee Choi, Dong Jun Lee, Jae Geun Kim, Ju Sung Lee, Young Wook Park, Byeong Kwon Ju

School of Electrical Engineering

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

7 Citations (Scopus)

Abstract

Organic light-emitting diodes (OLEDs) with an enhanced outcoupling efficiency and a suppressed efficiency roll-off were fabricated by inserting a nanosize pixel-defining layer (nPDL) that defines the OLED emission region as an array of nanoholes. The outcoupling efficiency of the nano-arrayed OLEDs was increased through the reduced surface plasmon polariton loss caused by the wavy diffraction grating at the metal-organic interface, and their efficiency roll-off was suppressed through the diffusive exciton outside the exciton-formation zone. As a result, the nano-arrayed OLEDs exhibited enhancements of 148.7% in the power efficiency and 137.0% in the external quantum efficiency at 1000 cd m^-2 compared with a reference device. Furthermore, the critical current density (J₀) where the external quantum efficiency decreased to half of its initial value was improved by a factor of 2.5.

Original language	English
Pages (from-to)	19330-19337
Number of pages	8
Journal	Nanoscale
Volume	10
Issue number	41
DOIs	https://doi.org/10.1039/c8nr03198c
Publication status	Published - 2018 Nov 7

ASJC Scopus subject areas

Materials Science(all)

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title = "Nano-arrayed OLEDs: Enhanced outcoupling efficiency and suppressed efficiency roll-off",

abstract = "Organic light-emitting diodes (OLEDs) with an enhanced outcoupling efficiency and a suppressed efficiency roll-off were fabricated by inserting a nanosize pixel-defining layer (nPDL) that defines the OLED emission region as an array of nanoholes. The outcoupling efficiency of the nano-arrayed OLEDs was increased through the reduced surface plasmon polariton loss caused by the wavy diffraction grating at the metal-organic interface, and their efficiency roll-off was suppressed through the diffusive exciton outside the exciton-formation zone. As a result, the nano-arrayed OLEDs exhibited enhancements of 148.7% in the power efficiency and 137.0% in the external quantum efficiency at 1000 cd m-2 compared with a reference device. Furthermore, the critical current density (J0) where the external quantum efficiency decreased to half of its initial value was improved by a factor of 2.5.",

author = "Ha Hwang and Shim, {Yong Sub} and Junhee Choi and Lee, {Dong Jun} and Kim, {Jae Geun} and Lee, {Ju Sung} and Park, {Young Wook} and Ju, {Byeong Kwon}",

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doi = "10.1039/c8nr03198c",

language = "English",

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T2 - Enhanced outcoupling efficiency and suppressed efficiency roll-off

AU - Hwang, Ha

AU - Shim, Yong Sub

AU - Choi, Junhee

AU - Lee, Dong Jun

AU - Kim, Jae Geun

AU - Lee, Ju Sung

AU - Park, Young Wook

AU - Ju, Byeong Kwon

PY - 2018/11/7

Y1 - 2018/11/7

N2 - Organic light-emitting diodes (OLEDs) with an enhanced outcoupling efficiency and a suppressed efficiency roll-off were fabricated by inserting a nanosize pixel-defining layer (nPDL) that defines the OLED emission region as an array of nanoholes. The outcoupling efficiency of the nano-arrayed OLEDs was increased through the reduced surface plasmon polariton loss caused by the wavy diffraction grating at the metal-organic interface, and their efficiency roll-off was suppressed through the diffusive exciton outside the exciton-formation zone. As a result, the nano-arrayed OLEDs exhibited enhancements of 148.7% in the power efficiency and 137.0% in the external quantum efficiency at 1000 cd m-2 compared with a reference device. Furthermore, the critical current density (J0) where the external quantum efficiency decreased to half of its initial value was improved by a factor of 2.5.

AB - Organic light-emitting diodes (OLEDs) with an enhanced outcoupling efficiency and a suppressed efficiency roll-off were fabricated by inserting a nanosize pixel-defining layer (nPDL) that defines the OLED emission region as an array of nanoholes. The outcoupling efficiency of the nano-arrayed OLEDs was increased through the reduced surface plasmon polariton loss caused by the wavy diffraction grating at the metal-organic interface, and their efficiency roll-off was suppressed through the diffusive exciton outside the exciton-formation zone. As a result, the nano-arrayed OLEDs exhibited enhancements of 148.7% in the power efficiency and 137.0% in the external quantum efficiency at 1000 cd m-2 compared with a reference device. Furthermore, the critical current density (J0) where the external quantum efficiency decreased to half of its initial value was improved by a factor of 2.5.

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Nano-arrayed OLEDs: Enhanced outcoupling efficiency and suppressed efficiency roll-off

Abstract

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