The effect of an external magnetic field on the luminescence of gallium phosphide crystals

The effect of a constant magnetic field on photoluminescence spectra in single crystals of gallium phosphide was found in the work. It was found that the preliminary exposure of GaP crystals in a constant magnetic field (In $<$ 0.5 T) at room temperature leads to the ignition of a luminescence band with a maximum of $\lambda$ = 565 nm when exposed to a laser crystal with a wavelength of 405 nm and a power of no more than 10 mW. At the same time, the relaxation time of the strip to its initial state did not exceed 3 hours. The authors attribute the observed features to the influence of the magnetic field on both the rate of intercombination conversion $(S_1\to T_1)$ in GaP crystals and the transition of gallium phosphide complexes with nitrogen to an excited state.