ABSTRACT
Glow Curve ................................................................................................ 153 7.1.5 Research Work Undertaken ...................................................................................... 154
7.2 Luminescence in Lithium-Based Low Z Sulfates ................................................................ 154 7.2.1 Introduction to Luminescence in Sulfates ................................................................ 154 7.2.2 Experimental Details ................................................................................................ 155 7.2.3 X-Ray Diffraction Data ............................................................................................ 156 7.2.4 PL Characteristics of LiNaSO4:Cu ........................................................................... 156 7.2.5 TL in LiNaSO4:Cu .................................................................................................... 158
7.2.5.1 Trap Parameters ......................................................................................... 161 7.3 Luminescence in Lithium-Based Low Z Fluorides .............................................................. 163
7.3.1 XRD Data ................................................................................................................. 164 7.3.2 TL Characteristics of LiNaF2:Cu ............................................................................. 165 7.3.3 TL Characteristics of LiNaF2:Cu,Mg ....................................................................... 165 7.3.4 TL Characteristics of LiNaF2:Cu,P .......................................................................... 166 7.3.5 PL Spectra ................................................................................................................. 170 7.3.6 Synthesis of LiNaF2:Eu ............................................................................................ 171
Light emission is based on a preceding excitation of atoms or molecules from a lower to a higher energy state; the exciting energy may be thermal, as in an incandescent lament or nonthermal as in the case of uorescent tube. The different processes by which nonthermal energy transforms into light are all together called “luminescence.” Such processes have been used since the middle of the last century either for radiation dosimetry, that is, determination of the integrated radiation dose to which humans are exposed or dating archaeological specimens and geological sediments.
