Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Enhancement of wall-plug efficiency in vertical InGaN/GaN LEDs by improved current spreading

Jun Ho Son, Buem Joon Kim, Chul Jong Ryu, Yang Hee Song, Hwan Keon Lee, Joo Won Choi, and Jong-Lam Lee

Open Access Open Access

Abstract

We present the enhancement of wall-plug efficiency in vertical InGaN/GaN light-emitting diodes (V-LEDs) by improved current spreading with a novel Al2O3 current blocking layer (CBL). The Al2O3 CBL deposited by electron-beam evaporation shows high transmittance and good corrosion resistance to acidic solutions. V-LEDs with an Al2O3 CBL show similar light output power but lower forward voltage as compared to those with a SiO2 CBL deposited by plasma-enhanced chemical vapor deposition. As a result, the wall-plug efficiency of V-LEDs with an Al2O3 CBL at 500 mA was improved by 5% as compared to those with a SiO2 CBL, and by 19% as compared to those without a CBL.

©2012 Optical Society of America

Full Article  |  PDF Article
More Like This
Use of a patterned current blocking layer to enhance the light output power of InGaN-based light-emitting diodes

Jae-Seong Park, Young Hoon Sung, Jin-Young Na, Daesung Kang, Sun-Kyung Kim, Heon Lee, and Tae-Yeon Seong
Opt. Express 25(15) 17556-17561 (2017)

Improved InGaN/GaN light-emitting diodes with a p-GaN/n-GaN/p-GaN/n-GaN/p-GaN current-spreading layer

Zi-Hui Zhang, Swee Tiam Tan, Wei Liu, Zhengang Ju, Ke Zheng, Zabu Kyaw, Yun Ji, Namig Hasanov, Xiao Wei Sun, and Hilmi Volkan Demir
Opt. Express 21(4) 4958-4969 (2013)

Very high external quantum efficiency and wall-plug efficiency 527 nm InGaN green LEDs by MOCVD

P. P. Li, Y. B. Zhao, H. J. Li, J. M. Che, Z.-H. Zhang, Z. C. Li, Y. Y. Zhang, L. C. Wang, M. Liang, X. Y. Yi, and G. H. Wang
Opt. Express 26(25) 33108-33115 (2018)

View More...

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)
Fig. 1
Fig. 1 (a) Schematic illustration of V-LEDs fabricated with an Al2O3 CBL. (b) Optical microscopy image of V-LEDs with an Al2O3 CBL after laser lift-off (left) and EL image at 5 mA (right). The n-electrode was not deposited. (c) Simulated current density distribution in the active region with and without CBL at 500 mA. (d) Current density profiles along the dotted line from Fig. 1(c).

Download Full Size | PDF

Fig. 2
Fig. 2 Light transmittance spectra of an Al2O3 (2000 Å) CBL deposited by electron-beam deposition and a SiO2 (2000 Å) CBL deposited by plasma-enhanced chemical vapor deposition.

Download Full Size | PDF

Fig. 3
Fig. 3 Depth profiles of an Al2O3 (2000 Å) CBL before and after piranha solution and aqua regia treatments.

Download Full Size | PDF

Fig. 4
Fig. 4 (a) Light output power of V-LEDs with and without CBL as a function of injection current. (b) Current-voltage (I-V) characteristics of V-LEDs with and without CBL. Inset table displays the forward voltage of the V-LEDs at 20, 350, and 500 mA.

Download Full Size | PDF

Fig. 5
Fig. 5 Efficiency droop behavior of V-LEDs: Wall-plug efficiency of V-LEDs with and without CBL as a function of injection current.

Download Full Size | PDF

Equations (1)

Equations on this page are rendered with MathJax. Learn more.

L s = t n ideal kT ρ J 0 e ,
Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use