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Upconversion Luminescence of SrTiO3:Er3+ Ultrafine Powders Produced by 785 nm Laser
Hai Guo¤,Yan-min Qiao,Ju-fang Zheng,Lei-hong Zhao
Author NameAffiliationE-mail
Hai Guo¤ Department of Physics, Zhejiang Normal University, Jinhua 321004, China; Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China ghh@zjnu.cn 
Yan-min Qiao Department of Physics, Zhejiang Normal University, Jinhua 321004, China  
Ju-fang Zheng Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Lei-hong Zhao Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China  
Abstract:
Er3+ doped SrTiO3 ultrafine powders were prepared by solid state reaction in a molten NaCl flux. The structural properties were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectroscopy. The Stokes emission spectra of Er3+ in SrTiO3:Er3+ ranging from green to near infrared region were investigated under 514.5 nm laser excitation. The green and redupconverted luminescence spectra of Er3+ were measured under excitation into the 4I9=2 level by 785 nm laser. The upconversion mechanisms were studied in detail through laser power dependence and Er3+ ion concentration dependence of upconverted emissions, and results show that excited state absorption and energy transfer process are the possible mechanisms for the upconversion. The upconversion properties indicate that SrTiO3:Er3+ may be used in upconversion phosphors.
Key words:  SrTiO3, Upconversion luminescence, Excited state absorption, Energy transfer
FundProject:省自然科学基金,其它
Upconversion Luminescence of SrTiO3:Er3+ Ultrafine Powders Produced by 785 nm Laser
郭海¤,乔艳敏,郑菊芳,赵雷洪
摘要:
以NaCl熔盐法制备了Er3+掺杂的SrTiO3超细粉末. 用X射线衍射、场发射扫描电镜和傅立叶红外光谱研究了SrTiO3:Er3+的结构性质. 测量了514.5 nm激光激发下样品的Stokes荧光谱. 在785 nm激光激发下,观测到很强的绿色和红色上转换发光. 通过研究上转换发光的激发光功率依赖关系、Er3+浓度依赖关系,研究了上转换发光机理. 指出了可能的激发态吸收过程和能量传递过程. 上转换发光性质表明SrTiO3:Er3+超细粉末可用做上转换荧光粉.
关键词:  SrTiO3,上转换发光,激发态吸收,能量传递
DOI:10.1088/1674-0068/21/03/233-238
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