Tunneling recombination luminescence in crystalline phosphors

Tomas et al. [63, 64] have dealt with the kinetics and spectra of low- 

By analyzing the spectra of the low-temperature recombination luminescence of GaP crystals under conditions of stationary excitation, Tomas et al. [63] have determined the distances of electron tunneling. The spectra of this luminescence at 1.6 K consist of a large number of intensive narrow lines. The appearance of these lines is due to the fact that the energy of the quantum hv emitted as a result of electron tunneling between the charged donor and the acceptor depends on the distance, R, between the reagents 

Similar results were later obtained for a number of other crystals as well (see the review by Williams [65]). 

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