首页 | 本学科首页   官方微博 | 高级检索  
     


Mechanoluminescence,thermoluminescence and photoluminescence studies on Al2O3:Tb phosphors
Authors:R.K. Rai  A.K. Upadhyay  R.S. Kher  S.J. Dhoble
Affiliation:1. Department of Physics, Government Engineering College, Ujjain 456010, India;2. Department of Physics, O.P. Jindal Institute of Technology, Raigarh 496001, India;3. Department of Physics, Government E.R.R.P.G. Science College, Bilaspur 495006, India;4. Department of Physics, R.T.M. Nagpur University, Nagpur 440033, India
Abstract:Terbium activated Al2O3 phosphors were synthesized by combustion technique using hydrazine as a reductive non-carbonaceous fuel. X-ray diffraction (XRD) patterns of the samples were recorded to confirm the formation of the sample. Scanning electron microscope (SEM) images were taken to study the surface morphology of the sample. The photoluminescence (PL), thermoluminescence (TL) and mechanoluminescence (ML) properties of the γ-ray irradiated samples were studied. ML was excited impulsively by dropping a piston on the sample. In ML glow curves one peak with a shoulder was observed. ML intensity increases with activator concentration. Optimum ML was observed for the sample having 0.5 mol% of Tb ions. In the TL glow curve two distinct peaks, one around 222 °C and another around 280 °C, were observed for the samples having 0.5 mol% of activator concentration. In the PL spectra the 5D47F5 line at 544 nm in the green region is observed, which is the strongest in Al2O3 system. It is suggested that de-trapping of trapped charge carriers followed by recombination is responsible for ML and TL in this system.
Keywords:
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号