Characterization of structure and photoluminescence properties for LiZn(B1-xAlx)O3 (x=0-1) oxides

Abstract

LiZn(B_1-xAl_x)O₃ (x=0-1) oxide was prepared by calcining at 750 ℃ for 5 h using a solid-state reaction method. Due to the difference in the ionic radii of B³⁺ and Al³⁺ ions, the lattice is distorted, and a bi-phase composed of ZnO and γ-LiAlO₂ oxides are formed for x=1. As the Al³⁺ ion doping contents increasing, the bi-phase oxide powder particles transform from agglomerated irregular to flaky structure. Under an excitation wavelength of 367 nm, two broad luminescence bands located at blue and yellow-green light regions are observed. The CIE chromaticity coordinates are located in the light blue light region for LiZnBO₃, whereas the CIE coordinates are located in the white light region (x=0.33, y=0.34) for the bi-phase oxides, and it is quite close to the NTSC standard white light coordinates (x=0.33, y=0.33).