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- W2388796515 abstract "A series of new green-emitting phosphors,Eu2+-activated Ca5-xEux(SiO4)2F2 were synthesized at 1 223 K by conventional high-temperature solid-state reactions under reductive atmosphere.And the photoluminescence excitation,diffuse reflectance and emission spectra,concentration quenching process,temperature dependence of luminescence and lifetime of phosphors were systematically investigated.The excitation spectrum shows that Ca5(SiO4)2F2∶Eu2+ can be efficiently excited by the incident lights of 250～440 nm,perfectly matching with the emissions wavelength of near-UV LEDs.The emission intensity is influenced by the Eu2+ content,and the optimal doping mole fraction is about 0.15.The concentration quenching mechanism was verified as dipole-dipole interaction and the value of the critical transfer distance was calculated as 1.5 nm.The temperature dependent emission spectra in the temperature range of 10~450 K show that the emission intensity at 450 K is 35% of the emission intensity at 10 K.At room temperature,the lifetimes of Eu2+ ions in Ca4.85Eu0.15(SiO4)2F2 phosphors are determined to be 1.78 μs and 7.79 μs,respectively.All of these indicate that Ca5(SiO4)2F2∶Eu2+ is a promising green phosphor candidate for phosphor-converted white LEDs." @default.
- W2388796515 created "2016-06-24" @default.
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- W2388796515 date "2011-01-01" @default.
- W2388796515 modified "2023-09-22" @default.
- W2388796515 title "Luminescence Properties of New Ca_5(SiO_4)_2F_2∶Eu~(2+) Green Phosphors for White LEDs" @default.
- W2388796515 hasPublicationYear "2011" @default.
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