Synthesis and thermoluminescence/optically stimulated luminescence properties of CaB4O7:Ce phosphor

Abstract

In this report, we presented the luminescence properties of CaB4O7:Ce phosphor synthesized by solid state method. The structural property was studied through X-ray diffraction and surface morphology was studied through scanning electronic microscope. Additionally, the photoluminescence (PL), thermoluminescence (TL) and optically stimulated luminescence (OSL) behaviors of CaB4O7:Ce phosphor was studied. Prepared phosphor was found to be in monoclinic structure, with the space group P21/n (14). The TL sensitivity of CaB4O7:Ce phosphor was 0.8 time than that of TLD-100 and kinetics parameters such as activation energy (eV), frequency factors (s) and order of kinetics were calculated by using peak shape method. The phosphor shows OSL sensitivity about 0.46 times than that of α-Al2O3:C (BARC). The decay pattern of prepared phosphor was faster than decay pattern of α-Al2O3:C phosphor. In OSL mode dose–response was almost linear in the range of measurement. Minimum detectable dose was found to be 35.40 mGy with 3σ of background. The effective atomic number (Zeff) of prepared phosphor is nearly similar to Zeff of Al2O3:C phosphor. The PL spectrum of CaB4O7:Ce showed emission in near blue region for the excitation of 290 nm under UV source.