Investigation of thermoluminescence properties of zinc aluminate nanocrystals

Abstract

Light emission from zinc aluminate nanocrystals have got a great attention in industries for controlling the quality of some glasses, ceramics, semiconductor products, biology and biochemistry for studding the properties( involving different chemical reaction) or contents of proteins,leaves, e.t.c. Thermoluminescence is one of the luminescence, which is the emission of light from an insulator or semiconductor when it is being heated, following the previous absorption of energy from radition. Therefore in this study the mathematical expression for the thermoluminescence intensity of zinc aluminate as a function of temperature has been derived specifically. The thermoluminescence (TL) Properties of Zinc aluminate nanocrystal were investigated in the View of first Order Kinetics. The continuous promotion in numerical methods has greatly helped to solve the complex thermoluminescence kinetic equations (rate equations) which can not be solved analytically. The complexity of the rate equations increase with the number of traps considered. As activation energy increases the glow curve shifts to higher temperatures with a decrease in the height. As frequency factor (s) increases the peak shifts to lower temperatures with an increase of the height and a decrease in width. A trapping center with a high frequency factor needs less energy or it needs lower temperature to free a charge carrier. linear heating rate ( ) can be increase the intensity of thermoluminescence also increase and for trapping electron more energy produce on the less linear heating rate and less energy were produced on the high linear heating rate