eprintid: 8341
rev_number: 22
eprint_status: archive
userid: 1567
dir: disk0/00/00/83/41
datestamp: 2012-11-21 11:56:09
lastmod: 2016-10-10 09:12:20
status_changed: 2012-11-21 11:56:09
type: article
metadata_visibility: show
title: Remote temperature mapping of high-power InGaN/GaN MQW
flip-chip design LEDs
language: english
abstract: We report on the study of heat 2D-distribution in InGaN LEDs with the stress made on local device overheating and
temperature gradients inside the structure. The MQW InGaN/GaN/sapphire blue LEDs are designed as bottom emitting
devices where light escapes the structure through the transparent GaN current spreading layer and sapphire substrate, whereas the LED structure with high-reflectivity Ni/Ag p-contact is bonded to the thermally conductive Si submount by a flip-chip method. The measurements are performed with an IR microscope operating in a time-resolved mode (3-5 μm spectral range, <20 μm spatial and 10 μs temporal resolution), while scanning a heat emission map through a transparent sapphire substrate. We show how current crowding (which is difficult to avoid) causes a local hot region near the n-contact pads and affects the performance of the device at a high injection level.
keywords: InGaN/GaN, quantum wells, light-emitting diodes, thermal imaging.
coverage: Solid state physics
status: final
role: author
creators_name: Malyutenko, V. K.
creators_name: Malyutenko, O. Y.
creators_name: Zinovchuk, A. V.
creators_name: Zakheіm, А. L.
ispublished: pub
subjects: QC
divisions: sch_phy
full_text_status: public
date: 2005
date_type: published
publication: Proceedings of SPIE
volume: 5941
publisher: International society for optics and photonics
pagerange: 59411K-1
refereed: TRUE
issn: 9780819459466
official_url: http://spie.org/
citation:   Malyutenko, V. K., Malyutenko, O. Y., Zinovchuk, A. V., Zakheіm, А. L.  (2005) Remote temperature mapping of high-power InGaN/GaN MQW flip-chip design LEDs.  Proceedings of SPIE, 5941.  59411K-1.  ISSN 9780819459466     
document_url: http://eprints.zu.edu.ua/8341/1/GetPDFServletfiletype.pdf