Light output performance of red AlGaInP-based light emitting diodes with different chip geometries and structures

Jeong Tak Oh; Sang Youl Lee; Yong Tae Moon; Hyung Moon Ji; Sunwoo Park; Yong Hong Ki; Young Song Ki; Chan Hyoung Oh; Jong In Shim; Hwan Hee Jeong; June O. Song; Hiroshi Amano; Tae Yeon Seong

doi:10.1364/OE.26.011194

Light output performance of red AlGaInP-based light emitting diodes with different chip geometries and structures

Jeong Tak Oh, Sang Youl Lee, Yong Tae Moon, Hyung Moon Ji, Sunwoo Park, Yong Hong Ki, Young Song Ki, Chan Hyoung Oh, Jong In Shim, Hwan Hee Jeong, June O. Song, Hiroshi Amano, Tae Yeon Seong

Department of Materials Science and Engineering

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

105 Citations (Scopus)

Abstract

We investigated the optical and electrical properties of red AlGaInP light-emitting diodes (LEDs) as functions of chip size, p-cladding layer thickness, and the number of multi-quantum wells (MQWs). External quantum efficiency (EQE) decreased with decreasing chip size. The ideality factor gradually increased from 1.47 to 1.95 as the chip size decreased from 350 μm to 15 μm. This indicates that the smaller LEDs experienced larger carrier loss due to Shockley-Read-Hall nonradiative recombination at sidewall defects. S parameter, defined as ∂lnL/∂lnI, increased with decreasing chip size. Simulations and experimental results showed that smaller LEDs with 5 pairs of MQWs had over 30% higher IQE at 5 A/cm² than the LED with 20 pairs of MQWs. These results show that the optimization of the number of QWs is needed to obtain maximum EQE of micro-LEDs.

Original language	English
Pages (from-to)	11194-11200
Number of pages	7
Journal	Optics Express
Volume	26
Issue number	9
DOIs	https://doi.org/10.1364/OE.26.011194
Publication status	Published - 2018 Apr 30

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "Light output performance of red AlGaInP-based light emitting diodes with different chip geometries and structures",

abstract = "We investigated the optical and electrical properties of red AlGaInP light-emitting diodes (LEDs) as functions of chip size, p-cladding layer thickness, and the number of multi-quantum wells (MQWs). External quantum efficiency (EQE) decreased with decreasing chip size. The ideality factor gradually increased from 1.47 to 1.95 as the chip size decreased from 350 μm to 15 μm. This indicates that the smaller LEDs experienced larger carrier loss due to Shockley-Read-Hall nonradiative recombination at sidewall defects. S parameter, defined as ∂lnL/∂lnI, increased with decreasing chip size. Simulations and experimental results showed that smaller LEDs with 5 pairs of MQWs had over 30% higher IQE at 5 A/cm2 than the LED with 20 pairs of MQWs. These results show that the optimization of the number of QWs is needed to obtain maximum EQE of micro-LEDs.",

author = "Oh, {Jeong Tak} and Lee, {Sang Youl} and Moon, {Yong Tae} and Ji, {Hyung Moon} and Sunwoo Park and Ki, {Yong Hong} and Ki, {Young Song} and Oh, {Chan Hyoung} and Shim, {Jong In} and Jeong, {Hwan Hee} and Song, {June O.} and Hiroshi Amano and Seong, {Tae Yeon}",

note = "Funding Information: LG Innotek Co., Ltd.; Global Research Laboratory program through the National Research Foundation of Korea funded by the Ministry of Science and ICT (NRF-2017K1A1A2013160). The authors gratefully acknowledge financial support from LG Innotek Co., Ltd. and National Research Foundation of Korea. Publisher Copyright: {\textcopyright} 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.",

year = "2018",

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doi = "10.1364/OE.26.011194",

language = "English",

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T1 - Light output performance of red AlGaInP-based light emitting diodes with different chip geometries and structures

AU - Oh, Jeong Tak

AU - Lee, Sang Youl

AU - Moon, Yong Tae

AU - Ji, Hyung Moon

AU - Park, Sunwoo

AU - Ki, Yong Hong

AU - Ki, Young Song

AU - Oh, Chan Hyoung

AU - Shim, Jong In

AU - Jeong, Hwan Hee

AU - Song, June O.

AU - Amano, Hiroshi

AU - Seong, Tae Yeon

N1 - Funding Information: LG Innotek Co., Ltd.; Global Research Laboratory program through the National Research Foundation of Korea funded by the Ministry of Science and ICT (NRF-2017K1A1A2013160). The authors gratefully acknowledge financial support from LG Innotek Co., Ltd. and National Research Foundation of Korea. Publisher Copyright: © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

PY - 2018/4/30

Y1 - 2018/4/30

N2 - We investigated the optical and electrical properties of red AlGaInP light-emitting diodes (LEDs) as functions of chip size, p-cladding layer thickness, and the number of multi-quantum wells (MQWs). External quantum efficiency (EQE) decreased with decreasing chip size. The ideality factor gradually increased from 1.47 to 1.95 as the chip size decreased from 350 μm to 15 μm. This indicates that the smaller LEDs experienced larger carrier loss due to Shockley-Read-Hall nonradiative recombination at sidewall defects. S parameter, defined as ∂lnL/∂lnI, increased with decreasing chip size. Simulations and experimental results showed that smaller LEDs with 5 pairs of MQWs had over 30% higher IQE at 5 A/cm2 than the LED with 20 pairs of MQWs. These results show that the optimization of the number of QWs is needed to obtain maximum EQE of micro-LEDs.

AB - We investigated the optical and electrical properties of red AlGaInP light-emitting diodes (LEDs) as functions of chip size, p-cladding layer thickness, and the number of multi-quantum wells (MQWs). External quantum efficiency (EQE) decreased with decreasing chip size. The ideality factor gradually increased from 1.47 to 1.95 as the chip size decreased from 350 μm to 15 μm. This indicates that the smaller LEDs experienced larger carrier loss due to Shockley-Read-Hall nonradiative recombination at sidewall defects. S parameter, defined as ∂lnL/∂lnI, increased with decreasing chip size. Simulations and experimental results showed that smaller LEDs with 5 pairs of MQWs had over 30% higher IQE at 5 A/cm2 than the LED with 20 pairs of MQWs. These results show that the optimization of the number of QWs is needed to obtain maximum EQE of micro-LEDs.

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Light output performance of red AlGaInP-based light emitting diodes with different chip geometries and structures

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