INVESTIGATION OF LUMINESCENCE STUDIES ON Tm3+ DOPED KBr SINGLECRYSTALS

Abstract

Tm3+
doped KBr single crystals have been grown from melted by using a Bridgemanstockbarger
technique. The characterizations are Optical absorption-transmittance, Photoluminescence [PL], Thermo luminescence
[TL], Powder X-Ray diffraction [PXRD], Laser Raman spectroscopy and Scanning Electron Microscopy [SEM]. The
optical absorption - transmittance study confirms the suitability of the grown crystals for optical device
applications. UV- Vis transmittance spectrum was recorded in the range 190-1100nm. PL emission wavelength was
observed around at 451nm blue emission with 350nm excitation.This451nmattributed tothe1G4→3H6 transition. The
grown crystals have been subjected to PXRD studies to determine the lattice parameters have been calculated
and are presented. It is observed that crystallizes is in Hexagonal system with space group Fm3m. SEM
micrograph analysis, the particle size ranges from few microns to 5µm. Trap parameters for the TL glow curve were
calculated by Chen’s peak shape method. TL emission confirms the participation of Thulium ions in the recombination
process in host material .