Time-resolved photoluminescence study of Ga In P alloys

The time-resolved photoluminescence spectra of ordered and disordered Ga0.52In0.48P alloys were studied at room temperature and at 77 K liquid nitrogen, respectively. The ordered samples have well fitted two exponential processes decay curves and the time constants are sample dependent and have little relationship with the ordering degree. The decay curve of disordered sample shows that it has single exponential process and its lifetime has a tendency of reduction with the decrease of excitation intensity. The photoluminescence spectra with different delay time at 77 K show that the ordered samples exhibit about 6 ∼ 10 meV blue-shift of PL peak energy with the delay time.