Improved light output power of ultraviolet GaN-based light-emitting diode by using AGPDCU reflector

Kee Baek Sim, Su Jung Yoon, Tae Yeon Seong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We investigated the output performance of UV LEDs with Ag-Pd-Cu (APC) and Ag-only reflectors. After annealing at 600°C, the Ag-only layer surface was seriously roughened, while the APC sample revealed a smooth surface with hillocks. The 600 °C-annealed APC and Ag samples gave reflectance of 84.9% and 70.9%at 385 nm. The contact resistivities of the 500 °C-annealed Ag and APC contacts were measured to be 2.59×10-4 and 1.85×10-4 cm2, respectively. For the annealed APC sample, the Ga 2p core level was shifted towards the lower binding-energies by 0.67 eV as compared to that of the as-deposited sample. The UV LEDs with the annealed APC reflector yielded 9.04% higher output at 100 mA than those with the Ag reflector. Based on the XRD pole figure and SEM results, the better thermal property of the APC sample is described in terms of thermal stress and surface energy.

Original languageEnglish
Title of host publicationWide Bandgap Semiconductor Materials and Devices 20
EditorsJ. Zavada, J. Hite, T. J. Anderson, V. Chakrapani, S. Jang, E. Douglas
PublisherElectrochemical Society Inc.
Pages27-33
Number of pages7
Edition5
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2019 Jan 1
EventSymposium on Wide Bandgap Semiconductor Materials and Devices 20 - 235th ECS Meeting - Dallas, United States
Duration: 2019 May 262019 May 30

Publication series

NameECS Transactions
Number5
Volume89
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

ConferenceSymposium on Wide Bandgap Semiconductor Materials and Devices 20 - 235th ECS Meeting
CountryUnited States
CityDallas
Period19/5/2619/5/30

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Sim, K. B., Yoon, S. J., & Seong, T. Y. (2019). Improved light output power of ultraviolet GaN-based light-emitting diode by using AGPDCU reflector. In J. Zavada, J. Hite, T. J. Anderson, V. Chakrapani, S. Jang, & E. Douglas (Eds.), Wide Bandgap Semiconductor Materials and Devices 20 (5 ed., pp. 27-33). (ECS Transactions; Vol. 89, No. 5). Electrochemical Society Inc.. https://doi.org/10.1149/08905.0027ecst