Performance improvements in InGaN/GaN light-emitting diodes using electron blocking layer with V-shaped graded Al composition

Ho Young Chung; Su Jin Kim; Tae Geun Kim

doi:10.1016/j.spmi.2014.07.046

Performance improvements in InGaN/GaN light-emitting diodes using electron blocking layer with V-shaped graded Al composition

Ho Young Chung, Su Jin Kim, Tae Geun Kim

School of Electrical Engineering

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

6 Citations (Scopus)

Abstract

In this study, AlGaN electron blocking layers (EBLs) with graded Al compositions have been numerically investigated to improve hole injection and electron confinement in InGaN/GaN-based light-emitting diodes (LEDs). Compared to LEDs with reference structure the output power of the proposed LEDs with decreasing/increasing (V-shaped) grading of the Al composition along the EBL growth direction was increased by a factor of ∼2.5, whereas the efficiency droop at high currents was greatly reduced. In addition, the forward voltage was reduced from 3.69 V to 3.42 V at 20 mA. These results indicate that well-designed EBLs using a V-shaped graded Al composition can enhance hole injection and electron confinement by reducing the polarization effect in these devices.

Original language	English
Pages (from-to)	390-397
Number of pages	8
Journal	Superlattices and Microstructures
Volume	75
DOIs	https://doi.org/10.1016/j.spmi.2014.07.046
Publication status	Published - 2014 Jan 1

ASJC Scopus subject areas

Electrical and Electronic Engineering
Condensed Matter Physics
Materials Science(all)

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title = "Performance improvements in InGaN/GaN light-emitting diodes using electron blocking layer with V-shaped graded Al composition",

abstract = "In this study, AlGaN electron blocking layers (EBLs) with graded Al compositions have been numerically investigated to improve hole injection and electron confinement in InGaN/GaN-based light-emitting diodes (LEDs). Compared to LEDs with reference structure the output power of the proposed LEDs with decreasing/increasing (V-shaped) grading of the Al composition along the EBL growth direction was increased by a factor of ∼2.5, whereas the efficiency droop at high currents was greatly reduced. In addition, the forward voltage was reduced from 3.69 V to 3.42 V at 20 mA. These results indicate that well-designed EBLs using a V-shaped graded Al composition can enhance hole injection and electron confinement by reducing the polarization effect in these devices.",

keywords = "Efficiency droop, Electron blocking layer, Light-emitting diodes, Numerical simulation",

author = "Chung, {Ho Young} and Kim, {Su Jin} and Kim, {Tae Geun}",

year = "2014",

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doi = "10.1016/j.spmi.2014.07.046",

language = "English",

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journal = "Superlattices and Microstructures",

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T1 - Performance improvements in InGaN/GaN light-emitting diodes using electron blocking layer with V-shaped graded Al composition

AU - Chung, Ho Young

AU - Kim, Su Jin

AU - Kim, Tae Geun

PY - 2014/1/1

Y1 - 2014/1/1

N2 - In this study, AlGaN electron blocking layers (EBLs) with graded Al compositions have been numerically investigated to improve hole injection and electron confinement in InGaN/GaN-based light-emitting diodes (LEDs). Compared to LEDs with reference structure the output power of the proposed LEDs with decreasing/increasing (V-shaped) grading of the Al composition along the EBL growth direction was increased by a factor of ∼2.5, whereas the efficiency droop at high currents was greatly reduced. In addition, the forward voltage was reduced from 3.69 V to 3.42 V at 20 mA. These results indicate that well-designed EBLs using a V-shaped graded Al composition can enhance hole injection and electron confinement by reducing the polarization effect in these devices.

AB - In this study, AlGaN electron blocking layers (EBLs) with graded Al compositions have been numerically investigated to improve hole injection and electron confinement in InGaN/GaN-based light-emitting diodes (LEDs). Compared to LEDs with reference structure the output power of the proposed LEDs with decreasing/increasing (V-shaped) grading of the Al composition along the EBL growth direction was increased by a factor of ∼2.5, whereas the efficiency droop at high currents was greatly reduced. In addition, the forward voltage was reduced from 3.69 V to 3.42 V at 20 mA. These results indicate that well-designed EBLs using a V-shaped graded Al composition can enhance hole injection and electron confinement by reducing the polarization effect in these devices.

KW - Efficiency droop

KW - Electron blocking layer

KW - Light-emitting diodes

KW - Numerical simulation

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