The SmF_(2.01)was synthesized by reducing SmF_3 in H_2 stream.As it was doped in KM_gF_3 and KCaF_3.there was emission of Sm^(2+) in KMgF_3 but no emission of Sm^(2+) in KCaF_3 was observed.
The aim of this presentation is to report a new result of afterglow materials. The Y 2O 2S∶Ln 3+ (Ln=Sm, Tm) phosphors show bright reddish orange and orange-yellow colors when excited by UV or visible light. The m...The aim of this presentation is to report a new result of afterglow materials. The Y 2O 2S∶Ln 3+ (Ln=Sm, Tm) phosphors show bright reddish orange and orange-yellow colors when excited by UV or visible light. The main spectroscopic characterizations of Sm 3+ and Tm 3+ in yttrium oxysulfide and their long-lasting phosphorescence were measured and discussed in this presentation. Their long-lasting phosphorescence can be seen by the naked eyes clearly for about one hour in the dark room after the irradiation light sources were removed. XRD and photoluminescence (PL) spectra as well as the luminance decay were used to characterize these long-lasting phosphorescence phosphors. The results of XRD indicate that the products synthesized through the flux fusion method under 1050 ℃ for 6 h have a good crystallization without any detectable amount of impurity phase. Both the PL spectra and luminance decay results reveal that these phosphors have efficient luminescent and good long-lasting properties. We believe that the experimental data gathered in our present work will be useful in finding some new long-lasting phosphors with different colors.展开更多
A series of Sm^(3+) doped KMgLa(PO_4)_2 have been prepared via a high-temperature solid-state method.The phase of the phosphor was characterized by X-ray diffraction,and the spectra of phosphors were measured by the f...A series of Sm^(3+) doped KMgLa(PO_4)_2 have been prepared via a high-temperature solid-state method.The phase of the phosphor was characterized by X-ray diffraction,and the spectra of phosphors were measured by the fluorescence spectrophotometer.Under 402 nm near-ultraviolet excitation,KMgLa(PPO_4)_2:Sm^(3+) shows orange-red emission,and the emission peak locates at 600 nm,which is associated to the ~4G_(2/5)→~6H_(9/2) transition of Sm^(3+).The emission intensity of phosphors can be tuned by changing the Sm^(3+) concentration,and the optimal Sm^(3+) doping concentration is about0.01.The concentration quenching phenomenon was observed in KMgLa(PO_4)_2:Sm^(3+),and the critical distance is calculated to be about 3.082 nm.The CIE chromaticity coordinates of phosphors shift from red to pink with the Sm^(3+) concentration increasing.All the results suggest that it could be a potential application in white LEDs manufacture.展开更多
基金Project Supported by the National Natural Science Foundation of China.
文摘The SmF_(2.01)was synthesized by reducing SmF_3 in H_2 stream.As it was doped in KM_gF_3 and KCaF_3.there was emission of Sm^(2+) in KMgF_3 but no emission of Sm^(2+) in KCaF_3 was observed.
文摘The aim of this presentation is to report a new result of afterglow materials. The Y 2O 2S∶Ln 3+ (Ln=Sm, Tm) phosphors show bright reddish orange and orange-yellow colors when excited by UV or visible light. The main spectroscopic characterizations of Sm 3+ and Tm 3+ in yttrium oxysulfide and their long-lasting phosphorescence were measured and discussed in this presentation. Their long-lasting phosphorescence can be seen by the naked eyes clearly for about one hour in the dark room after the irradiation light sources were removed. XRD and photoluminescence (PL) spectra as well as the luminance decay were used to characterize these long-lasting phosphorescence phosphors. The results of XRD indicate that the products synthesized through the flux fusion method under 1050 ℃ for 6 h have a good crystallization without any detectable amount of impurity phase. Both the PL spectra and luminance decay results reveal that these phosphors have efficient luminescent and good long-lasting properties. We believe that the experimental data gathered in our present work will be useful in finding some new long-lasting phosphors with different colors.
文摘A series of Sm^(3+) doped KMgLa(PO_4)_2 have been prepared via a high-temperature solid-state method.The phase of the phosphor was characterized by X-ray diffraction,and the spectra of phosphors were measured by the fluorescence spectrophotometer.Under 402 nm near-ultraviolet excitation,KMgLa(PPO_4)_2:Sm^(3+) shows orange-red emission,and the emission peak locates at 600 nm,which is associated to the ~4G_(2/5)→~6H_(9/2) transition of Sm^(3+).The emission intensity of phosphors can be tuned by changing the Sm^(3+) concentration,and the optimal Sm^(3+) doping concentration is about0.01.The concentration quenching phenomenon was observed in KMgLa(PO_4)_2:Sm^(3+),and the critical distance is calculated to be about 3.082 nm.The CIE chromaticity coordinates of phosphors shift from red to pink with the Sm^(3+) concentration increasing.All the results suggest that it could be a potential application in white LEDs manufacture.
