Low thermal-mass LEDs: Size effect and limits

Date
2014
Authors
Lu, S.
Liu W.
Zhang, Z.-H.
Tan, S.T.
Ju, Z.
Ji, Y.
Zhang X.
Zhang, Y.
Zhu, B.
Kyaw, Z.
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Optics Express
Print ISSN
10944087
Electronic ISSN
Publisher
Optical Society of American (OSA)
Volume
22
Issue
26
Pages
32200 - 32207
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Series
Abstract

In this work, low thermal-mass LEDs (LTM-LEDs) were developed and demonstrated in flip-chip configuration, studying both experimentally and theoretically the enhanced electrical and optical characteristics and the limits. LTM-LED chips in 25 × 25 μm2, 50 × 50 μm2, 100 × 100 μm2 and 200 × 200 μm2 mesa sizes were fabricated and comparatively investigated. Here it was revealed that both the electrical and optical properties are improved by the decreasing chip size due to the reduced thermal mass. With a smaller chip size (from 200 μm to 50 μm), the device generally presents higher current density against the bias and higher power density against the current density. However, the 25 × 25 μm2 device behaves differently, limited by the fabrication margin limit of 10 μm. The underneath mechanisms of these observations are uncovered, and furthermore, based on the device model, it is proven that for a specific flip-chip fabrication process, the ideal size for LTM-LEDs with optimal power density performance can be identified. ©2014 Optical Society of America

Course
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Book Title
Keywords
Fabrication, Flip chip devices, Optical properties, Device modeling, Electrical and optical properties, Flip-chip configurations, Optical characteristics, Optimal power, Power densities, Size effects, Thermal mass, Light emitting diodes, device failure analysis, devices, electronics, energy transfer, equipment design, heat, illumination, semiconductor, temperature, Energy Transfer, Equipment Design, Equipment Failure Analysis, Hot Temperature, Lighting, Miniaturization, Semiconductors, Temperature
Citation
Published Version (Please cite this version)