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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。
The surface of ZnO was modified by polyethylene oxide (PEO) to study the influence of organic coating on the optical properties of ZnO. The absorption and photoluminescence spectra were used to characterize and study the influence of PEO coating on the optical properties of ZnO nanoparticles. The results of absorption spectra show that with the increase of PEO content in ZnO thin film, the exciton absorption peak gradually moves to the low energy side. The photoluminescence spectrum is composed of ultraviolet emission and deep level defect luminescence related to oxygen vacancies. With the increase of PEO content in ZnO thin film, the ratio of UV emission to deep level emission intensity gradually increases. When ZnO thin film PEO reached the maximum value, the ratio was 31.5, far greater than that of pure ZnO thin film UV emission and deep level luminous intensity ratio of 1.04. Thus, ZnO coated with PEO improves UV luminescence efficiency and improves the quality of ZnO thin films.