Фотолюминесценция Кристаллов Cu-=SUB=-2-=/SUB=-O Различного Происхождения

The low-temperature luminescence spectra of Cu2O crystals grown by the different methods (copper oxidation, induction melting, magnetron sputtering, hydrothermal synthesis) and of natural crystal are compared. It was concluded that the high quality of natural crystals and crystals grown by the hydrothermal method is due to the low temperature process of their formation which minimizes the strains.