【摘要】 采用高温固相法合成了绿色荧光粉Ba2SiO4∶Ce3+,Eu2+。测量了它们的吸收光谱、激发光谱和发射光谱,观察到了Ba2SiO4中Ce3+对Eu2+发光的敏化现象,发光的敏化作用缘于Ce3+和Eu2+之间的高效无辐射能量传递。更多还原

【Abstract】 In the present paper,Ce³⁺ and Eu²⁺ co-doped silicate Ba₂SiO₄∶xCe³⁺,0.02Eu²⁺ green-emitting phosphors were synthesized by conventional solid-state reaction in a CO-reductive atmosphere.The diffuse reflection spectra,excitation spectra,and emission spectra of Ba₂SiO₄∶xCe³⁺,0.02Eu²⁺ were measured and studied.Due to the good overlap between the Ce³⁺ emission bands and the Eu²⁺ excitation bands,the energy transfer between Ce³⁺ and Eu²⁺ is expected to be very efficient and is confirmed by the emission spectra of Ba₂SiO₄∶xCe³⁺,0.02Eu²⁺.Co-doped Ba₂SiO₄∶xCe³⁺,0.02Eu²⁺ is efficient green phosphors with the excitation of longer wavelength UV light,and the emission intensity is stronger than Eu²⁺ doped Ba₂SiO₄ phosphors.Analyzing the spectra,the authors draw a conclusion that the luminescence sensitization of Eu²⁺ by Ce³⁺ in Ba₂SiO₄∶xCe³⁺,0.02 Eu²⁺ is due to the efficient energy transfer from Ce³⁺ to Eu²⁺ under long UV light.更多还原