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increases gradually with the decrease of I,,, and also becomes higher with increasing of temperat'ure. Linearity ( y = 1) is sometimes observed only a t sufficiently high I,,, above 10l6 quanta x x s-l. A phenomenological theoretical model is proposed which accounts for non-radiative surface recombination and non-uniform spatial distribution of the excited carriers and provides satisfactory qualitative agreement with the experimental findings.

on the occasion of his 80th birthdayThe main processes of energy relaxation of polaritons in dependence on their initial energy and temperature are determined for the layer polar semiconductors 2H-PbI, and red HgI,. It is shown that thermalization of the polaritons is reached duo to the '%herma1 barrier" effect.