Author Affiliations
Abstract
1 Department of Optical Science and Engineering, Fudan University, Shanghai Ultra-Precision Optical Manufacturing Engineering Center, Shanghai 200433, China
2 Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Shanghai 200433, China
3 College of Physical Science and Engineering, Tongji University, Shanghai 200092, China
4 Department of Medical Physics, Weifang Medical University, Shandong 261053, China
A number of zinc oxide (ZnO) films are deposited on silicon substrates using the magnetron sputtering method. After undergoing thermal treatment under different conditions, those films exhibit hexagonal wurtzite structures and different photoluminescent characteristics. Besides the notable ultraviolet emission, which is related to the free exciton effect, a distinct blue fluorescence around 475 nm is found in some special samples. The blue photoluminescence emission of the ZnO film is believed to be caused by oxygen vacancies.
310.6860 Thin films, optical properties 310.1860 Deposition and fabrication 300.6280 Spectroscopy, fluorescence and luminescence 260.3800 Luminescence Chinese Optics Letters
2015, 13(10): 103101
1 复旦大学 光科学与工程系, 上海 200433
2 复旦大学 物理系, 上海 200433
根据Dorenbos能级模型的推论, 利用掺杂Yb3+和Er3+对典型的长余辉材料SrAl2O4∶Eu2+,Dy3+(简称SAO∶ED)的发光特性(发光强度和余辉时间)进行调制。在发光特性分析中, 发展并使用了一种简便易行的解析模型, 而不是常用的多项e指数衰减函数的经验模型。研究发现, 正如Dorenbos所预言的, Yb3+掺杂确实能够提高SAO∶ED的发光强度; 但进一步研究发现, Yb3+不完全是发光中心, 而是一种辅助激发中心。Er3+掺杂效果也和Dorenbos的预言相同, 即它是一种俘获中心; 但是当Er3+和Yb3+共掺杂时, Er3+却有一种脱俘作用, 使得初始发光强度增强, 衰减常数变小, 但蓄光能力变化不大。
长余辉材料 发光衰减 掺杂 铝酸锶 long-persistent phosphor decay curve doping SrAl2O4
