Characteristics of Micro LEDs With Snowflake p-Electrode and Composite Textured Sidewalls

We demonstrate a hybrid structure incorporating concave-convex circular composite textured sidewalls and snowflake-like p-electrode, which is an effective approach to improve optical properties without deteriorating the electrical characteristics for micro-LEDs. Compared to the device with flat side...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 31; no. 21; pp. 1705 - 1708
Main Authors Tan, Lijun, Zhou, Quanbin, Wang, Hong, Yao, Ruohe
Format Journal Article
LanguageEnglish
Published New York IEEE 01.11.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Circularity
composite textured sidewalls
current crowding
Current density
Current distribution
Electrode pattern
Electrodes
Hybrid structures
InGaN/GaN
Light emitting diodes
micro light-emitting diode
Optical properties
Optical saturation
Optical surface waves
Performance enhancement
Photonics
Product design
Proximity effects
Scanning electron microscopy
Snowflakes
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Summary:We demonstrate a hybrid structure incorporating concave-convex circular composite textured sidewalls and snowflake-like p-electrode, which is an effective approach to improve optical properties without deteriorating the electrical characteristics for micro-LEDs. Compared to the device with flat sidewalls and disk p-electrode, the device with concave-convex circular composite textured sidewalls and 6-branches snowflake-like p-electrode exhibits a saturation light output power enhancement of 36.85%. And the forward voltage decreases by 7.6% at current density of 1732.4 A/cm 2 . The enhanced performances are mainly attributed to the decrease of total internal reflection at the concave-convex circular composite textured sidewalls and improvement of current distribution provided by 6-branches snowflake-like p-electrode.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2019.2942690