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The radiative recombination of the nitrogen-induced electron-hole liquid in GaP: N is observed. The liquid is formed by delocalization of excitons bound to nitrogen in crystals in which the nitrogen concentration exceeds 10¹⁷ cm^-3, and under intense band-gap or selective excitation into the lowest $J=1$ state of the bound exciton (A line). The observed binding energy is 17 meV relative to the free-exciton level. The liquid density is in the range of (1-4) ×{} 10¹⁸ cm^-3 for excitation intensity varying in the range of 10¹⁴-10¹⁸ photons/cm²/pulse.
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Kardontchik et al. (1979) studied this question.
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