An opto-thermal study of high brightness 280 nm emission AlGaN micropixel light-emitting diode arrays. (17th December 2020)

• Record Type: Journal Article
• Authors: Floyd, Richard; Gaevski, Mikhail; Alam, Md Didarul; Islam, Samia; Hussain, Kamal; Mamun, Abdullah; Mollah, Shahab; Simin, Grigory; Chandrashekhar, MVS; Khan, Asif
• Is Part Of: Applied physics express. Volume 14:Number 1(2021)
• Publication Date: 2020-12-17
• Subjects: AlGaN DUV LED -- UVC LED -- UWBG AlGaN -- micropixel -- thermal -- light output power -- efficiency droop; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.35848/1882-0786/abd140
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We present a study of the light output power and the thermal impedance of 281 nm emission AlGaN based micropixel LEDs. A modular interconnected micropixel array design is presented which enables dense packing with area and power scalability. We study 5–15 μ m diameter stand-alone devices and parallel-connected micropixel arrays with 5 μ m interpixel gaps. A standalone 5 μ m pixel emits 291 W cm −2 at 10.2 kA cm −2 DC-drive. A power as high as 23 mW (361 W cm −2 ) was measured at a pulsed-pump current of 800 mA (∼15 kA cm −2 ) for an interconnected array. These are the smallest and brightest DUV LEDs to date.