Lock-in thermography approach for imaging the efficiency of light emitters and optical coolers

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Journal Title
Journal ISSN
Volume Title
School of Science | A4 Artikkeli konferenssijulkaisussa
Date
2017
Major/Subject
Mcode
Degree programme
Language
en
Pages
7
Series
SPIE Proceedings, Volume 10121
Abstract
Developing optical cooling technologies requires access to reliable efficiency measurement techniques and ability to detect spatial variations in the efficiency and light emission of the devices. We investigate the possibility to combine the calorimetric efficiency measurement principles with lock-in thermography (LIT) and conventional luminescence microscopy to enable spatially resolved measurement of the efficiency, current spreading and local device heating of double diode structures (DDS) serving as test vessels for developing thermophotonic cooling devices. Our approach enables spatially resolved characterization and localization of the losses of the double diode structures as well as other light emitting semiconductor devices. In particular, the approach may allow directly observing effects like current crowding and surface recombination on the light emission and heating of the DDS devices.
Description
Keywords
lock-in thermography, calorimetry, efficiency
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Citation
Radevici, Ivan & Tiira, Jonna & Oksanen, Jani. 2017. Lock-in thermography approach for imaging the efficiency of light emitters and optical coolers. SPIE Proceedings. Volume 10121. 7. DOI: 10.1117/12.2249978.