Model of photon emission from luminescent center

Abstract

Luminescence is the phenomenon investigated and applied in many disciplines of science and technique. Spectral and kinetic measurements of luminescence provide much information concerning the mechanism of luminescent devices. Better understanding of the mechanism allows to improve the devices. It has been known for a long time that the spectral and kinetic properties of luminescence depend on the temperature. It is assumed that fluorescence does not depend on temperature but practically lifetime of fluorescence changes insignificantly with temperature. Until now, to our knowledge, nobody describes mathematically the dependence. Here is reported the model of photon emission permitting a description of the dependence. It is found that lifetime of fluorescence decreases with increasing the square root of temperature. The dependence is weaker than temperature dependence of phosphorescence. It agrees with experimental observations. In the model presented, the new application of Maxwell distribution is shown. This idea can be used in other investigations. Also the presented model can be applied, for example, in nuclear physics.