Luminescence in divalent impurity activated LiF single crystals

Abstract

<span style="font-size:14.0pt;line-height: 115%;font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" color:black;mso-ansi-language:en-in;mso-fareast-language:en-in;mso-bidi-language:="" hi"="" lang="EN-IN">LiF single crystals doped with varying concentrations of Ba, Sr and Ca have been grown by Bridgman technique and their <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:hiddenhorzocr;color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">thermo-luminescence <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">(TL) and TL emission spectrum induced by γ-irradiation at room temperature for doses between10³ to 10⁵ R have been recorded. In the TL glow curves, peaks around 380, 425 and 500 K are produced irrespective of the impurity added, but, the relative intensity of these glow peaks varies for different dopants. At low γ-exposure the TL efficiency increases with decrease in the ionic radius of the dopant. The dependence of various TL peaks on γ-exposure shows that, low temperature peaks have got their optimum intensity as compared to high temperature TL peaks.</span></span></span>