石英玻璃衬底上纤锌矿Mg0.25Zn0.75O薄膜的结构及光学性能

Mg_xZn_1-xO材料是一种新型光电功能材料.采用溶胶凝胶法在石英玻璃上制备了Mg_0.25Zn_0.75O薄膜，理论结合实验研究了Mg_0.25Zn_0.75O薄膜的结构和光学性能.研究表明，石英玻璃衬底上Mg_0.25Zn_0.75O薄膜呈六方纤锌矿结构，薄膜均匀，平均粒径约为20nm.吸收光谱表明吸收带边始于3 关键词： 0.25Zn_0.75O薄膜')" href="#">Mg_0.25Zn_0.75O薄膜 溶胶凝胶法 石英玻璃衬底 紫外发光

Structure and optical properties of wurtzite Mg0.25Zn0.75O film deposited on quartz glass substrate

Mg_xZn_1-xO has been an object of intense study as a novel photo-electronic function material in recent years. Mg_0.25Zn_0.75O film was prepared on quartz glass substrate by sol-gel method. Structure and optical properties of Mg_0.25Zn_0.75O film were studied both in theory and by experiment. The result indicates that Mg_0.25Zn_0.75O film has hexagonal wurtzite structure. The film is homogeneous and the average grain size is about 20nm. Absorption spectrum indicates that the absorption edge starts at 360nm and the corresponding forbidden band width is 3.83eV. The luminescence spectrum of the sample is composed of three peaks at 384.9， 444.8 and 533.6nm respectively and the peak of excitation spectrum is at 378nm. The crystal lattice of Mg_0.25Zn_0.75O film is increased， the forbidden band width is broadened and the ultraviolet and blue-green luminescence peaks red-shift about 59， 14 and 12.6nm， respectively， due to the interstitial defects introduced by the surplus Mg ions.