Premium
Time‐Resolved Photoluminescence Study of Ordered Ga 0.5 In 0.5 P under High Pressure
Author(s) -
Kobayashi T.,
Minaki M.,
Takashima K.,
Uchida K.,
Nakahara J.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221980107
Subject(s) - photoluminescence , alloy , spectral line , materials science , condensed matter physics , activation energy , energy (signal processing) , analytical chemistry (journal) , molecular physics , chemistry , physics , optoelectronics , metallurgy , chromatography , astronomy , quantum mechanics
We have measured time‐resolved photoluminescence (TR‐PL) spectra in ordered and disordered Ga 0.5 In 0.5 P alloys at 12 K and at pressures up to 3 GPa to investigate the characteristics of the main broad PL spectrum at ≈1.91 eV in nominally ordered alloys. At normal pressure, unlike the disordered alloy, the PL‐decay profiles for the ordered alloys change remarkably for small changes in detection energy. This indicates the presence of adjacent overlapping emissions of different nature. Together with the prolonged nonexponential decay curves, a gradual red‐shift of the low‐energy peak with delay time is observed for the first time, indicating spatially indirect recombinations. With increasing pressure, the constituent emissions shift toward higher energies at rates slightly smaller than that for the disordered alloy. At 3 GPa, the PL decay appears to be insensitive to the detection energy, and a faster decay is observed.