LUMINESCENCE AND STRUCTURAL PROPERTIES ON Sm3+ DOPED KBr SINGLE CRYSTALS

Abstract

Single crystals of Sm3+ doped KBr were grown by vertical Bridgemann Stockbarger technique. The grown
crystal were subjected to the characterization such as Optical absorption, Photoluminescence (PL), Thermoluminescence
(TL), and TL emission, studies. The Optical absorption, TL studies on KBr: Sm3+ crystals irradiated with γ-rays is
reported. The shoulder around 348nm is due to formation of V-band and bell shaped band at 611nm are noticed because
of F-band formation in Optical Absorption spectrum. Under the excitation of 405nm light, the emission spectra were
governed by the characteristic reddish-orange luminescence primarily originated due to transition from the excited 4G5/2
to the 6H7/2 lower level noticed at 603nm. Thermoluminescence (TL) glow peak reveals two clearly visible distinct peaks
at temperature around 464K and 491K. The calculated kinetic parameters show that both peaks follow the second order
kinetics.