ZnGa₂O₄ 및 ZnGa₂O₄: Eu^(3+) 結晶의 光學的 特性 硏究

Abstract

In the present work, basic studies on optical properties of ZnGa₂O₄ and ZnGa₂O₄:Eu^(3+) crystals were carried out. The composition, structure, and optical properties of ZnGa₂O₄ and ZnGa₂O₄:Eu^(3+) crystals were studied Stoichiometry of these compound semiconductors were determined using the energy dispersive x-ray analyser(EDX). The quantitative ratios of composition elements between the starting samples and the measured samples are reasonable values from the results of EDX with in the limit of detection error. The x-ray diffraction(XRD) analysis revealed that ZnGa₂O₄ and ZnGa₂O₄ : Eu^(3+) crystals have a cubic structure and the samples were a layered type with the -axis perpendicular to the layers in the crystals. The lattice constant of these samples were =8.3348Å for ZnGa₂O₄, and =8.3123Å for ZnGa₂O₄:Eu^(3+) crystals. The optical absorption spectra obtained near the fundamental absorption edge showed that these compounds have a direct energy band gaps. The direct energy gaps of ZnGa₂O₄ and ZnGa₂O₄ : Eu^(3+) are given by 4.386eV and 4.324eV at 297K, respectively.