Linear and nonlinear optical properties of In(x)Ga(1-x)N/GaN heterostructures

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We have systematically studied both the spontaneous and stimulated emission properties in blue-light-emitting In(x)Ga(1-x)N/GaN multiple quantum well structures using various linear and nonlinear optical techniques. Our experimental observations are consistently understandable in the context of localization of carriers associated with, large potential fluctuations in the In(x)Ga(1-x)N active regions and at heterointerfaces. The studies have been done as a function of excitation power density, excitation photon energy, excitation length, and temperature. The results show carrier localization features for spontaneous emission and demonstrate the presence of potential fluctuations in the In(x)Ga(1-x)N active region of the In(x)Ga(1-x)N/GaN structures and its predominant role in spontaneous emission. In addition, the experimental observations strongly indicate that the stimulated emission has the same microscopic origin as spontaneous emission, i.e., radiative recombination of localized states. Therefore, we conclude that carriers localized at potential fluctuations in In(x)Ga(1-x)N active layers and interfaces can play a key role in not only spontaneous but also stimulated emission of state-of-the-art blue-light-emitting In(x)Ga(1-x)N/GaN quantum structures.
Publisher
AMER PHYSICAL SOC
Issue Date
2000-03
Language
English
Article Type
Article
Keywords

CHEMICAL-VAPOR-DEPOSITION; MULTIPLE-QUANTUM WELLS; GAN THIN-FILMS; RECOMBINATION DYNAMICS; LOCALIZED EXCITONS; INGAN SINGLE; RADIATIVE RECOMBINATION; GAIN SPECTROSCOPY; LASER-DIODES; BAND-GAP

Citation

PHYSICAL REVIEW B, v.61, no.11, pp.7571 - 7588

ISSN
1098-0121
DOI
10.1103/PhysRevB.61.7571
URI
http://hdl.handle.net/10203/76022
Appears in Collection
PH-Journal Papers(저널논문)
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