Spectral Characteristics of Mn2+ Doped Na5Lu9F32 Single Crystals

Abstract

Mn2+ ion doped Na5Lu9F32 single crystals are grown by an improved Bridgman method. The absorption and fluorescence spectrum of single crystals in the range of 300–800 nm are measured to investigate the spectral properties. Fluorescent band centered at 550 nm was observed in the fluorescence spectrum of the crystals corresponding to the 4T1(4G) → 6A1(6S) transition of the Mn2+ ion. An excitation peak of 400 nm is observed in the excitation spectrum due to the charge transfer transition of electrons from the ground state to the conduction band. The calculated values for the crystal field (Dq) and Racah parameters indicate that a stable cubic crystal structure of Mn2+ ion surrounded by eight F− ligands can be formed with the introduction of Mn2+ ion into Na5Lu9F32 single crystals.