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Quantum efficiency of GaAs/AlGaAs thin films Xingsheng Xu, Toshiki Yamada, Akira Otomo The optical properties of GaAs/AlGaAs thin films with photonic crystals were investigated by measuring their photoluminescence spectra. The spectral intensities, lifetimes, and quantum efficiencies decreased greatly compared with those in blank material without photonic crystals. The quantum efficiencies in the material were also calculated from spectral intensities and lifetimes and the quantum efficiencies calculated from those two methods agreed with each other to some extent. doi:10.1007/s00340-008-3221-1 |