Synthesis of Uniform Rare Earth Doped Gd2O2S Sub-micron Sized Spheres Using Gas-Aided Sulfurization and their Optical Characteristics.

ABSTRACT: In this work, we report a detailed study of the synthesis of sub-micron sized Gd2O2S spheres using a two-step process: (1) amorphous precursor synthesis using the solvothermal method where a surfactant was used to control particle morphology, followed by (2) crystallization to form Gd2O2S polycrystalline spheres in a sulfur-rich environment. The crystallization and sulfurization processes are investigated by monitoring the crystal growth at different temperatures and under different environments using mainly x-ray diffraction and analysis of the precursor's thermal decomposition profile. The optical emissions of the Er and Yb-Er doped Gd2O2S upon excitation at 975 nm were investigated to identify the optimal dopant concentrations, optimal heat treatment temperature as well as to further el

SUBMITTER: He S 

PROVIDER: S-EPMC5718361 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature