Lead phosphate glasses singly doped with Dy^3＋ ions were studied. The samples were prepared in a glove box in order to eliminate hydroxyl groups. Local structures were examined using FT-IR. Excitation and luminescenc...Lead phosphate glasses singly doped with Dy^3＋ ions were studied. The samples were prepared in a glove box in order to eliminate hydroxyl groups. Local structures were examined using FT-IR. Excitation and luminescence spectra for Dy^3＋ ions in inves- tigated lead phosphate glasses were registered. Luminescence intensity ratio Y/B related to 4F9/2→^6HJ/2 （where J=15, 13） transitions was determined and luminescence lifetime （ζm） for the 4F9/2 state of Dy^3＋ions were also measured.展开更多
Dy3+-doped boroaluminasilicate(BAS) glasses with high effective visible fluorescence emission were synthesized. Optical absorption and fluorescence spectra of these glasses have been studied. Using J-O theory, the int...Dy3+-doped boroaluminasilicate(BAS) glasses with high effective visible fluorescence emission were synthesized. Optical absorption and fluorescence spectra of these glasses have been studied. Using J-O theory, the intensity parameters (×10-20 cm2) Ω2=4.75, Ω4=0.98 and Ω6=2.24 have been evaluated with a reasonable agreement between the measured and calculated f-value. These parameters were used to predict various spectroscopic properties of excited levels of Dy3+ in BAS glasses. The bright yellow emission at 575 nm (4F9/2→6H13/2) has been observed, apart from 4F9/2→6H15/2 (482 nm) and 4F9/2→6H11/2 (662 nm) emission transitions with excitation at 451 nm (6H15/2→4H15/2). Stimulated emission cross-sections of the emission bands have been computed based on the measured Δλ. Concentration quenching will occur when concentration of Dy3+ exceeds 1.0%(mole fraction) and the quenching mechanism involves quadrupole-quadrupole interaction.展开更多
Dy^3＋-doped borate glasses （LBLB） with high effective visible fluorescence emission were synthesized. The absorption spectrum and fluorescence spectrum of this glass were measured and analyzed. By using J-O theory,...Dy^3＋-doped borate glasses （LBLB） with high effective visible fluorescence emission were synthesized. The absorption spectrum and fluorescence spectrum of this glass were measured and analyzed. By using J-O theory, the oscillator strengths for some absorption transitions were calculated according to the absorption spectra. The intensity parameters Ω1 （t = 2, 4, 6） of Dy^3＋ were determined by using a least-squares fitting approach, and the values are 4.04 × 10^-20, 1.30 × 10^-20 and 1.82 × 10^-20 cm, respectively. The root-mean-square deviation δrma was calculated. Under UV light excitation, Dy^3＋-doped borate glasses （LBLB） emit intense yellowish white lights. The excitation spectrum indicates that argon laser is the effective excitation source in Dy^3＋-doped LBLB glasses展开更多
基金Project supported by National Science Centre(Poland)(2011/01/B/ST5/00978)
文摘Lead phosphate glasses singly doped with Dy^3＋ ions were studied. The samples were prepared in a glove box in order to eliminate hydroxyl groups. Local structures were examined using FT-IR. Excitation and luminescence spectra for Dy^3＋ ions in inves- tigated lead phosphate glasses were registered. Luminescence intensity ratio Y/B related to 4F9/2→^6HJ/2 （where J=15, 13） transitions was determined and luminescence lifetime （ζm） for the 4F9/2 state of Dy^3＋ions were also measured.
基金Trans-Century Training Programme Foundation for the Talents by the Ministry of EducationNatural Science Fund of Jiangsu Province (BK2004121)
文摘Dy3+-doped boroaluminasilicate(BAS) glasses with high effective visible fluorescence emission were synthesized. Optical absorption and fluorescence spectra of these glasses have been studied. Using J-O theory, the intensity parameters (×10-20 cm2) Ω2=4.75, Ω4=0.98 and Ω6=2.24 have been evaluated with a reasonable agreement between the measured and calculated f-value. These parameters were used to predict various spectroscopic properties of excited levels of Dy3+ in BAS glasses. The bright yellow emission at 575 nm (4F9/2→6H13/2) has been observed, apart from 4F9/2→6H15/2 (482 nm) and 4F9/2→6H11/2 (662 nm) emission transitions with excitation at 451 nm (6H15/2→4H15/2). Stimulated emission cross-sections of the emission bands have been computed based on the measured Δλ. Concentration quenching will occur when concentration of Dy3+ exceeds 1.0%(mole fraction) and the quenching mechanism involves quadrupole-quadrupole interaction.
文摘Dy^3＋-doped borate glasses （LBLB） with high effective visible fluorescence emission were synthesized. The absorption spectrum and fluorescence spectrum of this glass were measured and analyzed. By using J-O theory, the oscillator strengths for some absorption transitions were calculated according to the absorption spectra. The intensity parameters Ω1 （t = 2, 4, 6） of Dy^3＋ were determined by using a least-squares fitting approach, and the values are 4.04 × 10^-20, 1.30 × 10^-20 and 1.82 × 10^-20 cm, respectively. The root-mean-square deviation δrma was calculated. Under UV light excitation, Dy^3＋-doped borate glasses （LBLB） emit intense yellowish white lights. The excitation spectrum indicates that argon laser is the effective excitation source in Dy^3＋-doped LBLB glasses
