Short notes: Photoluminescence of C60 fullerite intercalated with nitrogen molecules wide range of temperatures

Abstract

The optical properties of C60 single crystals, intercalated with nitrogen molecules, were investigated by the spectral-luminescence method in the temperature range 20–230 K. The saturation was carried out under a pressure of 30 atm at various temperatures from 200 to 550°C. For the C60 + N2 system, the presence of a temperature boundary of the adsorption crossover of about 420°C was established (transition from the diffusion mechanism of intercalation — physisorption, to chemical interaction — chemisorption). The temperature dependence of the integrated radiation intensity of a new nitrogen-containing substance based on C60 fullerite has been recorded for the first time. Quenching of photoluminescence at low temperatures was found. The observed new effect of low-temperature quenching of photoluminescence is explained by the appearance in the process of chemical interaction between the N2 impurity molecules and the C60 matrix of effective exciton trapping centers and nonradiative deactivation of electronic excitation.