作　　者： ; ; ; ; ; ; ; ;

机构地区： 东北师范大学物理学院先进光电子功能材料研究中心

出　　处： 《发光学报》 2004年第5期524-528,共5页

摘　　要： 利用聚氧化乙烯(PEO)对ZnO表面进行修饰,研究有机包覆对ZnO光学性质的影响。用吸收光谱和光致发光光谱来表征和研究PEO包覆对ZnO纳米粒子光学性质的影响。吸收光谱结果表明随着ZnO薄膜中PEO含量的增加,激子吸收峰逐渐向低能侧方向移动。光致发光光谱是由紫外发射和与氧空位有关的深能级缺陷发光组成,且随着ZnO薄膜中PEO含量的增加,紫外发射与深能级发光强度之比逐渐增大,当ZnO薄膜中的PEO达到最大值时,其比值为31.5,远远大于纯ZnO薄膜的紫外发射与深能级发光强度之比1.04。由此可见,ZnO被PEO包覆后,提高了紫外发光效率,改善了ZnO薄膜的质量。 Zinc oxide (ZnO) has attracted interest owing to its potential applications including nonlinear optical devices, blue-violet light emission devices, buffer layer for GaN-based devices, visible range transparent electrode for solar cell, display and surface acoustic wave devices. Inspired by the application of ZnO, numerous studies have appeared on the luminescence of ZnO. Two emission bands are usually found. One is a narrow UV emission band and the other is a broad visible emission band at approximately 520 nm. The UV emission from ZnO is commonly attributed to band-to-band or near band edge emission. The nature of the visible emission has been the subject of much research, however, the mechanism behind the visible luminescence has been very difficult to establish. During the past years, oxygen vacancies have been assumed to be the most likely candidates for the recombination centers involved in the visible luminescence of ZnO. Recently, Van Dijken et al. proposed a model for the kinetic mechanism behind the visible emission of nanocrystalline ZnO particles; the visible emission of ZnO was a recombination of a shallowly trapped electron with a deeply trapped hole and the surface state plays an important role during the recombination process. To study the effect of surface defects on luminescence we used polyethylene oxide (PEO) as capping polymer molecules to achieve the surface-modified ZnO nanoparticles. ZnO nanoparticles surface modified by polyethylene oxide(PEO)were fabricated and the influence of surface-modification on optical properties of ZnO were studied. The PL spectra showed two emission bands: one was UV emission, the other was deep level emission related to oxygen vacancies. When the PEO content increased, the ratio of the UV emission to the deep level emission increased. When the PEO content was the largest, the ratio is 31.5, which is much bigger than that of the pure ZnO nanoparticles. So when ZnO nanoparticles were modified by PEO, the UV emission efficiency was enhanced and the quality of th

关 键 词： 聚氧化乙烯 氧化锌 表面修饰 深能级发射

领　　域： [理学] [理学] [理学] [理学]