Measurement of piezoelectric field in single- and double-quantum-well green LEDs using electroreflectance spectroscopy

High piezoelectric field in green light-emitting diodes (LEDs) has been a challenge for direct measurement for a long time. In this work, we report the direct experimental measurement of the large piezoelectric field in green LEDs by using single- and double-quantum-well samples with the electrorefl...

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Published in:Japanese Journal of Applied Physics 2014-09, Vol.53 (9), p.98002-1-098002-3
Main Authors: Usman, Muhammad, Kim, Hyunsung, Shim, Jong-In, Shin, Dong-Soo
Format: Article
Language:English
Subjects:
Defects
Light-emitting diodes
Piezoelectricity
Spectroscopy
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description High piezoelectric field in green light-emitting diodes (LEDs) has been a challenge for direct measurement for a long time. In this work, we report the direct experimental measurement of the large piezoelectric field in green LEDs by using single- and double-quantum-well samples with the electroreflectance spectroscopy at room temperature. Comparison with the theoretical prediction indicates that there is an influence of defects in reducing the piezoelectric field in green LED samples.
doi_str_mv 10.7567/JJAP.53.098002
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subjects Defects
Light-emitting diodes
Piezoelectricity
Spectroscopy
title Measurement of piezoelectric field in single- and double-quantum-well green LEDs using electroreflectance spectroscopy
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