Combustion Synthesis and Luminescent Properties of CaO: Eu3+, M+ （M=Li, Na, K） Phosphor
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2010年第2期
论文作者：康明
文章页码：179 - 183
摘 要：Li + , Na + , or K + co-doped CaO: Eu3+ phosphors were prepared by the combustion synthesis method and characterized by X-ray diffraction （XRD）, photoluminescence and photolumi- nescence excitation （PL-PLE） spectra. The experimental results show that, upon excitation with 250 nm xenon light, the emission spectrum of the CaO: Eu3+ consists of 4f-4f emission transitions from the 5D0 excited level to the 7FJ （J=1, 2, 3） levels with the mainly electric dipole transition 5D0→7F2 of Eu3+, indicating that the Eu3+ occupies a low symmetry. The charge-transfer band （CTB） shows somewhat red shift with the decreasing ionic radii of co-doped alkali metal ions. The PL and PLE intensities are significantly enhanced, especially the strongest intensity of luminescent is CaO: Eu3+, Li + phosphor, when alkali metal ions are incorporated. The strongest peak of emission is slightly shifted from 614 to 593 nm, indicating that the Eu3+ ion locates in a symmetric position （Oh） when alkali metal ions are incorporated.
康明
College of Material Science and Engineering, Southwest University of Science and Technology
摘 要：Li + , Na + , or K + co-doped CaO: Eu3+ phosphors were prepared by the combustion synthesis method and characterized by X-ray diffraction （XRD）, photoluminescence and photolumi- nescence excitation （PL-PLE） spectra. The experimental results show that, upon excitation with 250 nm xenon light, the emission spectrum of the CaO: Eu3+ consists of 4f-4f emission transitions from the 5D0 excited level to the 7FJ （J=1, 2, 3） levels with the mainly electric dipole transition 5D0→7F2 of Eu3+, indicating that the Eu3+ occupies a low symmetry. The charge-transfer band （CTB） shows somewhat red shift with the decreasing ionic radii of co-doped alkali metal ions. The PL and PLE intensities are significantly enhanced, especially the strongest intensity of luminescent is CaO: Eu3+, Li + phosphor, when alkali metal ions are incorporated. The strongest peak of emission is slightly shifted from 614 to 593 nm, indicating that the Eu3+ ion locates in a symmetric position （Oh） when alkali metal ions are incorporated.
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