Title :
Two-photon photoluminescence and current images of bulk GaN and InGaN green LEDs
Author :
Sun, Chi-Kuang ; Gan, Kian-Giap ; Kao, Fu-Jen ; Huang, Mao-Kuo ; Wang, Yung-Shun ; Mack, Michael P. ; DenBaars, Steven P.
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
Our recent studies shows that GaN possesses large two-photon absorption coefficients, even at infrared (IR) wavelength dose to midgap energy. This indicates that two photon confocal photoluminescence images and two-photon optical-beam-induced-current (TP-OBIC) microscopy can be applied on the GaN studies and imaging. Confocal laser scanning microscopy provides a significant improvement in axial resolution over conventional epi-fluorescence microscopy by eliminating out-of-focus fluorescence using a spatial filter in the form of a confocal aperture
Keywords :
OBIC; light emitting diodes; optical focusing; optical microscopy; optical scanners; photoluminescence; semiconductor device testing; two-photon spectroscopy; GaN; InGaN; InGaN green LEDs; axial resolution; bulk GaN; confocal aperture; confocal laser scanning microscopy; epi-fluorescence microscopy; large two-photon absorption coefficients; midgap energy; out-of-focus fluorescence; spatial filter; two photon confocal photoluminescence images; two-photon optical-beam-induced-current microscopy; two-photon photoluminescence; Electromagnetic wave absorption; Energy resolution; Fluorescence; Gallium nitride; Optical filters; Optical imaging; Optical microscopy; Photoluminescence; Spatial filters; Spatial resolution;
Conference_Titel :
LEOS '99. IEEE Lasers and Electro-Optics Society 1999 12th Annual Meeting
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-5634-9
DOI :
10.1109/LEOS.1999.813465
