A new Sm 3+ doped yttrium oxysulfide phosphor, which has the long-lasting phosphorescence, was synthesized by flux fusion method. The phosphors showed three typical transitions of Sm 3+ ( 4G 5/2→ 6H J, J=5/2,7/2,9/2)...A new Sm 3+ doped yttrium oxysulfide phosphor, which has the long-lasting phosphorescence, was synthesized by flux fusion method. The phosphors showed three typical transitions of Sm 3+ ( 4G 5/2→ 6H J, J=5/2,7/2,9/2), and the emission peaks located at 570, 606 and 659 nm respectively. A prominent luminescence and phosphorescence in orange-red can be seen in this phosphor when illuminated with UV light or visible light. The synthesized phosphors were characterized by X-ray diffraction, the excitation and photoluminescence spectra, and the after-glow intensity decay curve. The result shows that the Y 2O 2S∶ Sm 3+ phosphor is another efficient orange-red phosphor.展开更多
Green-emitting phosphors doped with Ce and Tb have been synthesized for the first time by reaction of BPO 4, prepared in our laboratory,with rare earth oxides. It is qualitatively accounted for that the prepared phosp...Green-emitting phosphors doped with Ce and Tb have been synthesized for the first time by reaction of BPO 4, prepared in our laboratory,with rare earth oxides. It is qualitatively accounted for that the prepared phosphors belong to borophosphate,and replacement of P with B doesn’t cause variation of monoclinic crystal system of orthophosphate.XRDs of the samples prepared at different temperatures show that the product is formed at 850℃.The primary investigation of luminescent of phosphors indicates that with the increment of Tb content,the brightness and purity of luminescent will be improved.展开更多
La 4- x (P 2O 5) 3:Eu x were synthesized from a mixed solution of La(NO 3) 3 and Eu(NO 3) 3 in nitric acid solution(pH=4.5) followed by precipitation on addition of Na 4P 2O 7 solution and calcination at 900 ℃. The p...La 4- x (P 2O 5) 3:Eu x were synthesized from a mixed solution of La(NO 3) 3 and Eu(NO 3) 3 in nitric acid solution(pH=4.5) followed by precipitation on addition of Na 4P 2O 7 solution and calcination at 900 ℃. The products showed a highest excitation peak at 349 nm and highest emission peak at 596 nm .展开更多
文摘A new Sm 3+ doped yttrium oxysulfide phosphor, which has the long-lasting phosphorescence, was synthesized by flux fusion method. The phosphors showed three typical transitions of Sm 3+ ( 4G 5/2→ 6H J, J=5/2,7/2,9/2), and the emission peaks located at 570, 606 and 659 nm respectively. A prominent luminescence and phosphorescence in orange-red can be seen in this phosphor when illuminated with UV light or visible light. The synthesized phosphors were characterized by X-ray diffraction, the excitation and photoluminescence spectra, and the after-glow intensity decay curve. The result shows that the Y 2O 2S∶ Sm 3+ phosphor is another efficient orange-red phosphor.
文摘Green-emitting phosphors doped with Ce and Tb have been synthesized for the first time by reaction of BPO 4, prepared in our laboratory,with rare earth oxides. It is qualitatively accounted for that the prepared phosphors belong to borophosphate,and replacement of P with B doesn’t cause variation of monoclinic crystal system of orthophosphate.XRDs of the samples prepared at different temperatures show that the product is formed at 850℃.The primary investigation of luminescent of phosphors indicates that with the increment of Tb content,the brightness and purity of luminescent will be improved.
文摘La 4- x (P 2O 5) 3:Eu x were synthesized from a mixed solution of La(NO 3) 3 and Eu(NO 3) 3 in nitric acid solution(pH=4.5) followed by precipitation on addition of Na 4P 2O 7 solution and calcination at 900 ℃. The products showed a highest excitation peak at 349 nm and highest emission peak at 596 nm .
