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

Abstract

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. (C) 2014 The Japan Society of Applied Physics