Open AccessTransient behaviours of yellow and blue luminescence bands in unintentionally doped GaN
Author(s) -
Baibin Wang,
Feng Liang,
Degang Zhao,
Yuhao Ben,
Jing Yang,
Ping Chen,
Zongshun Liu
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.416424
Subject(s) - luminescence , materials science , persistent luminescence , doping , excitation , optics , blueshift , laser , analytical chemistry (journal) , transient (computer programming) , intensity (physics) , laser beams , optoelectronics , photoluminescence , chemistry , physics , thermoluminescence , chromatography , quantum mechanics , computer science , operating system
Yellow Luminescence (YL) band and blue luminescence (BL) band in a studied unintentionally doped GaN sample show a transient behaviour where the observed luminescence intensities change with the exposure time of the sample under 325 nm laser beam excitation at 10-300 K. Such an intensity variation is accompanied with a red-shift for YL peak at 10-140 K and one for BL peak at 140 K. We propose that such behaviours are related to the chemical transformations of YL-related C N and C N O N defects, and BL-related C N -H i and C N O N -H i defects during the exposure.