Abstract
The photoluminescence intensity of an alcoholic solution of propolis at room temperature is studied as a function of the propolis concentration. It is found that, unlike in most organic substances and complex compounds (including natural bee honey), where luminescence is maximal at a certain solute-to-solvent ratio, the luminescence intensity increases with the concentration of propolis and is maximal in elastic solid films. Variation of the film’s temperature in the range from 520 to 570 K causes neither a shift of the fundamental absorption edge nor a qualitative change in the photoluminescence spectrum (Emax = 2.9 eV at T = 300 K) but leads to a decrease in the luminescence intensity. This effect may be due to the disturbance of molecular order in the films under study. It is inferred that propolis deserves attention as a promising optoelectronic material.
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