Full text loading...
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.
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.
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.
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.
Article metrics loading...