Comparative efficiency analysis of GaN-based light-emitting diodes and laser diodes

Nobel laureate Shuji Nakamura predicted in 2014 that GaN-based laser diodes are the future of solid state lighting. However, blue GaN-lasers still exhibit less than 40% wall-plug efficiency, while some GaN-based blue light-emitting diodes exceed 80%. This paper investigates non-thermal reasons behin...

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Bibliographic Details
Published in:Applied physics letters 2016-07, Vol.109 (2)
Main Author: Piprek, Joachim
Format: Article
Language:English
Subjects:
Applied physics
Efficiency
Electrical resistivity
Energy conversion efficiency
Gallium nitrides
Hole conductivity
Laser beam cladding
Lasers
Light emitting diodes
Magnesium
Organic light emitting diodes
Semiconductor lasers
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Summary:Nobel laureate Shuji Nakamura predicted in 2014 that GaN-based laser diodes are the future of solid state lighting. However, blue GaN-lasers still exhibit less than 40% wall-plug efficiency, while some GaN-based blue light-emitting diodes exceed 80%. This paper investigates non-thermal reasons behind this difference. The inherently poor hole conductivity of the Mg-doped waveguide cladding layer of laser diodes is identified as main reason for their low electrical-to-optical energy conversion efficiency.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4958619