Equilibrium and non-equilibrium processes in sillenites

Mieczyslaw Tadeusz Borowiec

doi:10.1117/12.280727

14 July 1997 Equilibrium and non-equilibrium processes in sillenites

Mieczyslaw Tadeusz Borowiec

Proceedings Volume 3178, Solid State Crystals: Growth and Characterization; (1997) https://doi.org/10.1117/12.280727
Event: XII Conference on Solid State Crystals: Materials Science and Applications, 1996, Zakopane, Poland

Abstract

The equilibrium and non-equilibrium thermal characteristics of the optical properties of photochromic materials are considered for the sillenites. For many years sillenites have been very well known as photochromic materials. The photoinduced coloration observed for them is connected with the charge transfer of some local centers. The kinetics of the photochromic absorption depends on temperature and light intensity. The photochromic saturation changes of the optical absorption are in a good relation to the hyperbolic tangent function of the temperature reverse. The fitting parameters describe the energy depth of the highest electron trap and the temperature range for stability of the effect. The new dynamic effect related to photochromism called the thermoabsorption is observed in the optical absorption during the enough quick temperature sweep. The magnitude of the effect is typically dependent on the rate of temperature's changes what is common for the non-equilibrium processes. The thermoabsorption effect is complementary to the thermoluminescence. The parameters describing the non-equilibrium optical absorption are connected with energy depth of electron and hole traps and they are in the reasonable agreement with the parameters for the equilibrium process.

Citation Download Citation

Mieczyslaw Tadeusz Borowiec "Equilibrium and non-equilibrium processes in sillenites", Proc. SPIE 3178, Solid State Crystals: Growth and Characterization, (14 July 1997); https://doi.org/10.1117/12.280727

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