Evidence of a competitive phenomenon between the 0.72 μm and 0.93 μm luminescences of Cu2O

Luminescence studies after excitation by a frequency doubled Nd : YAG laser showed evidence of competition between the 0.72 μm and 0.93 μm extrinsic luminescences in Cu₂O. The luminescence outputs of 0.72 μm and 0.93 μm were observed as a function of temperature at various laser intensities. The data suggest attenuation of 0.93 μm with the onset of 0.72 μm. This phenomenon has never been reported in the literature and represents a departure from the conventional theories on the luminescence of cuprous oxide.