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.
|Title of host publication||Wide Bandgap Semiconductor Materials and Devices 20|
|Editors||S. Jang, V. Chakrapani, J. Zavada, T. J. Anderson, J. Hite, E. Douglas|
|Publisher||Electrochemical Society Inc.|
|Number of pages||7|
|ISBN (Electronic)||9781607688662, 9781607688686, 9781607688693, 9781607688709, 9781607688709, 9781607688716, 9781607688723|
|Publication status||Published - 2019|
|Event||Symposium on Wide Bandgap Semiconductor Materials and Devices 20 - 235th ECS Meeting - Dallas, United States|
Duration: 2019 May 26 → 2019 May 30
|Conference||Symposium on Wide Bandgap Semiconductor Materials and Devices 20 - 235th ECS Meeting|
|Period||19/5/26 → 19/5/30|
Bibliographical noteFunding Information:
This work was supported by the Global Research Laboratory (GRL) program through the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT (NRF-2017K1A1A2013160).
© The Electrochemical Society
ASJC Scopus subject areas