Dy^3＋-doped Ge-Ga-Se chalcogenide glasses and GeSe2-Ga2Se3-CsI chalcohalide glasses were prepared. The absorption, emission properties, and local structure of the glasses were investigated. When excited at 808 nm dio...Dy^3＋-doped Ge-Ga-Se chalcogenide glasses and GeSe2-Ga2Se3-CsI chalcohalide glasses were prepared. The absorption, emission properties, and local structure of the glasses were investigated. When excited at 808 nm diode laser, intense 1.32 and 1.55 μm near-infrared luminescence were observed with full width at half maximum （FWHM） of about 90 and 50 nm, respectively. The lifetime of the 1.32 μm emission varied due to changes in the local structure surrounding Dy^3＋ ions. The longest lifetime was over 2.5 ms, and the value was significantly higher than that in other Dy^3＋-doped glasses. Some other spectroscopic parameters were calculated by using Judd-Ofelt theory. Meanwhile, Ge-Ga-Se and GeSe2-Ga2Se3-CsI glasses showed good infrared transmittance. As a result, Dy^3＋-doped Ge-Ga-Se and GeSe2-Ga2Se3-CsI glasses were believed to be useful hosts for 1.3 μm optical fiber amplifier.展开更多
Se-based chalcohalide glass of 50GeSe2-25In2Se3-25CsI was prepared. The thermal and optical characterizations revealed that this host was thermally and optically superior for practical applications. Strong emission ce...Se-based chalcohalide glass of 50GeSe2-25In2Se3-25CsI was prepared. The thermal and optical characterizations revealed that this host was thermally and optically superior for practical applications. Strong emission centered at 1.22μm was observed in all Tm3＋ sin- gle-doped, Tm3＋/Ho3＋ and Tm3＋/Er3＋ co-doped samples with an excitation of 808 nm wavelength. The emission was attributed to the Tm3＋： 3Hs-→3H6 transition. The co-doping of Ho3＋ or Er3＋ largely broadened the width and slightly strengthened the intensity of the 1.22 gm emis- sion. The possible energy transfer processes and luminescence kinetics were figured. In addition, its potential application as the host material for novel optical amplifiers was discussed.展开更多
Te-Se glass and adding As,Ge elements to it are studied with Selt-Consistent-Field Discrete Variatioal X(a) (SEF-DV-X(a)), one of the molecule orbital calculating methods in quantum chemistry. The chemical bonding is ...Te-Se glass and adding As,Ge elements to it are studied with Selt-Consistent-Field Discrete Variatioal X(a) (SEF-DV-X(a)), one of the molecule orbital calculating methods in quantum chemistry. The chemical bonding is used to discuss the relations between structures and properties with the varations of compositions of the glasses. The calculated results show that the strength of covalent and ionic bonds are both in the order of Ge-Se > As-Se > Te-Se, which is consistent with the experimental result of the glass-transition temperature (T-g) of the corresponding grasses. The Te-I bond in which I atom is one-coordinate is stronger than that in which I atom is two-coordinate, As-I and As-As bonds are both stronger than the two types of Te-I bonds. The waek Te-I bonds have been replaced by the stronger As-I and As-As bonds, which is just the reason why As addition in TeX glasses can obviously improve the thermal and chemical properties.展开更多
As-S-X (X = Cl, Br, I) and As-Y-Br (Y = Sd Se, Te) glasses are studied with Self-Consistent-Field Discrete Variational X(a)(SCF-DV-X(a)) tone of the molecule orbital calculating methods in quantum chemistry. The chemi...As-S-X (X = Cl, Br, I) and As-Y-Br (Y = Sd Se, Te) glasses are studied with Self-Consistent-Field Discrete Variational X(a)(SCF-DV-X(a)) tone of the molecule orbital calculating methods in quantum chemistry. The chemical bonding is studied to discuss the relations between structures and properties with the variations of compositions of the glasses. The calculated results show that the strength of covalent and ionic bonds are both in the order of As-S-Cl > As-S-Br > As-S-I as well as As-S-Br > As-Se-Br > As-Te-Br, it is consistent with the experimental result of the glass-transition temperature (Tg) of the corresponding glasses. The differences of chemical bond strength and Tg among As-S-X (X = Cl ,Br ?I) glasses a-re larger are larger than those among As-Y-Br(Y = S, Se, Te) glasses and the largest difference of chemical bond strength is that of ionic bond of As-X among As-S-X (X = Cl, Br, I) glasses,so the variations of X (X = Cl, Br, I), the end atoms on the chains in the glasses, play the more important role to affect the structure and property of the glasses.展开更多
基金supported by the China’s Manned Space Program (921-21 Project)
文摘Dy^3＋-doped Ge-Ga-Se chalcogenide glasses and GeSe2-Ga2Se3-CsI chalcohalide glasses were prepared. The absorption, emission properties, and local structure of the glasses were investigated. When excited at 808 nm diode laser, intense 1.32 and 1.55 μm near-infrared luminescence were observed with full width at half maximum （FWHM） of about 90 and 50 nm, respectively. The lifetime of the 1.32 μm emission varied due to changes in the local structure surrounding Dy^3＋ ions. The longest lifetime was over 2.5 ms, and the value was significantly higher than that in other Dy^3＋-doped glasses. Some other spectroscopic parameters were calculated by using Judd-Ofelt theory. Meanwhile, Ge-Ga-Se and GeSe2-Ga2Se3-CsI glasses showed good infrared transmittance. As a result, Dy^3＋-doped Ge-Ga-Se and GeSe2-Ga2Se3-CsI glasses were believed to be useful hosts for 1.3 μm optical fiber amplifier.
基金supported by Science & Technology Inovation Fund of Shanghai Institute of Ceramics
文摘Se-based chalcohalide glass of 50GeSe2-25In2Se3-25CsI was prepared. The thermal and optical characterizations revealed that this host was thermally and optically superior for practical applications. Strong emission centered at 1.22μm was observed in all Tm3＋ sin- gle-doped, Tm3＋/Ho3＋ and Tm3＋/Er3＋ co-doped samples with an excitation of 808 nm wavelength. The emission was attributed to the Tm3＋： 3Hs-→3H6 transition. The co-doping of Ho3＋ or Er3＋ largely broadened the width and slightly strengthened the intensity of the 1.22 gm emis- sion. The possible energy transfer processes and luminescence kinetics were figured. In addition, its potential application as the host material for novel optical amplifiers was discussed.
文摘Te-Se glass and adding As,Ge elements to it are studied with Selt-Consistent-Field Discrete Variatioal X(a) (SEF-DV-X(a)), one of the molecule orbital calculating methods in quantum chemistry. The chemical bonding is used to discuss the relations between structures and properties with the varations of compositions of the glasses. The calculated results show that the strength of covalent and ionic bonds are both in the order of Ge-Se > As-Se > Te-Se, which is consistent with the experimental result of the glass-transition temperature (T-g) of the corresponding grasses. The Te-I bond in which I atom is one-coordinate is stronger than that in which I atom is two-coordinate, As-I and As-As bonds are both stronger than the two types of Te-I bonds. The waek Te-I bonds have been replaced by the stronger As-I and As-As bonds, which is just the reason why As addition in TeX glasses can obviously improve the thermal and chemical properties.
文摘As-S-X (X = Cl, Br, I) and As-Y-Br (Y = Sd Se, Te) glasses are studied with Self-Consistent-Field Discrete Variational X(a)(SCF-DV-X(a)) tone of the molecule orbital calculating methods in quantum chemistry. The chemical bonding is studied to discuss the relations between structures and properties with the variations of compositions of the glasses. The calculated results show that the strength of covalent and ionic bonds are both in the order of As-S-Cl > As-S-Br > As-S-I as well as As-S-Br > As-Se-Br > As-Te-Br, it is consistent with the experimental result of the glass-transition temperature (Tg) of the corresponding glasses. The differences of chemical bond strength and Tg among As-S-X (X = Cl ,Br ?I) glasses a-re larger are larger than those among As-Y-Br(Y = S, Se, Te) glasses and the largest difference of chemical bond strength is that of ionic bond of As-X among As-S-X (X = Cl, Br, I) glasses,so the variations of X (X = Cl, Br, I), the end atoms on the chains in the glasses, play the more important role to affect the structure and property of the glasses.
