Photoluminescent studies in the wide temperature range (20-300 K) of hydrogen and nitrogen doped C₆₀ fullerite.

DOI: 10.62564/M4-VZ0144

Viktor Zoryansky, Peter Zinoviev

B.Verkin Institute for Low Temperature Physics and Engineering of NAS of Ukraine


The optical properties of C₆₀ single crystals saturated with hydrogen and nitrogen molecules were studied by the spectral-luminescence method in the temperature range of 20–230 K. The saturation was carried out under a pressure of 30 atm at different temperatures from 200 °C to 550 °C. Early it have been established of C₆₀ fullerite intercalated with H₂ [1] and N₂ [2] molecules that the temperature limit of the adsorption crossover is about 300 °C and 420 °C, respectively (transition from the diffusion mechanism of intercalation - physisorption to chemical interaction - chemisorption). At saturation temperatures higher than this temperature limit the process of chemical interaction of H₂ or N₂ impurity molecules and the C₆₀ matrix occurs with the formation of a new chemical compounds - C₆₀Hₓ and (C₅₉N)₂. For the first time we present the results of the photoluminescent properties of new C₆₀ fullerite intercalated with N₂ and H₂ molecules - hydrofullerite C₆₀Hₓ and biazafullerite (C₅₉N)₂. In C₆₀Hₓ compound the integrated radiation intensity is independent from temperature has been recorded. This behavior of integrated radiation intensity have been explained by the absence of an orientational phase transition and the transition to a glassy state in hydrofullerite. In (C₅₉N)₂ compound the temperature dependence of the integral radiation intensity has been registered. Also in biazafullerite the low temperature quenching of photoluminescence has been detected. The new effect of low-temperature quenching of photoluminescence has been explained by the appearance of effective capture centers of the excitons which occurs as a result of the chemical interaction of N₂ impurity molecules and the C₆₀ matrix, and the non-radiative deactivation of electronic excitation [3].

Keywords
Fullerite C₆₀, hydrogen, nitrogen, photoluminescence, low temperatures

Acknowledgments
Not provided

References
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