退火处理对YMnO3薄膜的结构和荧光性能的影响  

Effect of Post-Annealing on the Structure and Fluorescence Properties of YMnO_3 Thin Films

作　　者：李娜[1] 林方婷[1] 马学鸣[1] 石旺舟[1] 

机构地区：[1]光谱学与波谱学教育部重点实验室,华东师范大学物理系,上海200062

出　　处：《光谱学与光谱分析》2008年第3期606-608,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(60606004);上海市科委纳米专项项目(0652nm023)资助

摘　　要：室温下,采用脉冲激光沉积方法在Si(100)衬底上制备了YMnO3薄膜,并对其进行了不同温度的退火处理。采用X射线衍射和荧光光谱分析方法对薄膜的结构和荧光特性进行了研究。结果表明:通过退火处理,可以得到正交相和六方相共存的多晶态YMnO3薄膜,并且随着退火温度的升高,两相的比例发生变化,由正交相为主转变为六方相为主。YMnO3薄膜样品的荧光发射峰集中在波长430～620nm范围内,可能是由Mn3+离子从5T2到5E之间的能级跃迁所引起的。其荧光强度随着退火温度的升高逐渐增强,但峰位基本保持不变,说明薄膜结构的改变对Mn3+离子的能级跃迁几率有明显的影响,对能级位置的影响不大;而且荧光光谱还显示在同一薄膜中各个荧光峰的相对强度随着退火温度的变化不大。YMnO3 thin films deposited on Si（100） substrate by pulsed laser deposition at room temperature were annealed at different temperatures.The microstructure and fluorescent emission properties of these films were studied using XRD and UV-Vis spectroscopy.The results show that polycrystalline YMnO3 thin films can be obtained through post-annealing,in which hexagonal phase and orthorhombic phase coexist.And with increasing the temperature,the ratio of orthorhombic phase to hexagonal phase varies considerably.The results also show that fluorescence peaks in the wavelength range of 430-620 nm maybe originate from the transition from ^5T2 to ^5E of Mn^3＋.The intensity of fluorescence peaks is enhanced with increasing the temperature.However,the positions of fluorescence peaks remain invariable.These results indicate that the change in the film structure affects the transition probability greatly but almost has no effect on the position of energy level.Meanwhile,the relative intensity ratio of cyan fluorescence peak to green fluorescence peak is almost unchanged.

关 键 词：YMnO3薄膜 荧光性能 脉冲激光沉积 

分 类 号：O484[理学—固体物理]