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Comprehensive study of time-lapsed peak shift in InGaN quantum well structures: Discrimination of localization effect from internal field effect
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10.1063/1.2437680
/content/aip/journal/apl/90/5/10.1063/1.2437680
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/5/10.1063/1.2437680
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Time-resolved PL spectra of sample A with evolving time. Excitation power densities are 0.3, 1.2, and, . Time-lapsed peak shifts are observed and the amount of the peak shift increases with increasing excitation power density.

Image of FIG. 2.
FIG. 2.

Peak energy positions in time-resolved PL spectra for various excitation power densities for samples A and B (inset). The amount of peak energy shift increases as excitation power density increases in sample A, while few differences are observed in sample B for different excitation power densities.

Image of FIG. 3.
FIG. 3.

Time-lapsed peak shifts as a function of excitation power density for samples A and B. Simulations of internal field effect under charge screening are shown in dashed lines. Dotted lines are guides for eye on saturation points of the peak shifts. Schematic diagrams of radiative processes under (a) potential fluctuation due to In localization and (b) internal field effect are depicted with photogenerated electrons and holes.

Image of FIG. 4.
FIG. 4.

EL emission peaks measured with fabricated LD chips under various driving currents. Laser operation is observed in sample B with threshold current, (inset). However, lasing action is not observed for sample A in the range of the given driving current.

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/content/aip/journal/apl/90/5/10.1063/1.2437680
2007-02-02
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comprehensive study of time-lapsed peak shift in InGaN quantum well structures: Discrimination of localization effect from internal field effect
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/5/10.1063/1.2437680
10.1063/1.2437680
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