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
A series of chalcohalide glasses based on the composition of 0.9（Ge30Ga5Se65）-0.1CsI with different Tm3＋/Dy3＋-codoped ions concentrations were synthesized by melt-quenching technique.The absorption spectra and 2.9...A series of chalcohalide glasses based on the composition of 0.9（Ge30Ga5Se65）-0.1CsI with different Tm3＋/Dy3＋-codoped ions concentrations were synthesized by melt-quenching technique.The absorption spectra and 2.9 μm mid-infrared fluorescence spectra of glass samples under 800 nm laser excitation were measured.The results showed that Tm3＋ was an efficient sensitizer,which could enhance the Dy3＋： 2.9 μm fluorescence intensity significantly.The effective energy transfer between the two rare-earth ions were mainly attributed to the resonance energy transfer from Tm3＋：3F4 to Dy3＋：6H11/2 level.Emission cross section of 2.9 μm mid-infrared luminescence was also investigated according to Judd-Ofelt theory,σe=2.51×10–20 cm2.展开更多
This paper reports the formation and some properties of a new class of chalcohalide glasses in the As2Tef iodide systems. The As2Te3-Pb12, As2Te3-HgI2, As2Te3-CitI and As2Te3-AgI systems can form stable bulk glasses i...This paper reports the formation and some properties of a new class of chalcohalide glasses in the As2Tef iodide systems. The As2Te3-Pb12, As2Te3-HgI2, As2Te3-CitI and As2Te3-AgI systems can form stable bulk glasses in wide composition regions ?and no bulk glass formation was found in the As2Te3-TH sys-tem. As2Te3-based glasses have glass transition tempera-展开更多
Nd^(3+),Er^(3+)ions doped 0.9(Ge_(0.25)Ga_(0.10)S_(0.65))-0.1CsBr chalcohalide glass were prepared via melt-quenching method,and heat treated at 360℃ in high purity Ar gas atmosphere for different hours for the early...Nd^(3+),Er^(3+)ions doped 0.9(Ge_(0.25)Ga_(0.10)S_(0.65))-0.1CsBr chalcohalide glass were prepared via melt-quenching method,and heat treated at 360℃ in high purity Ar gas atmosphere for different hours for the early stage of crystallization.The effect of heat treatment durations on visible upconversion luminescence and near infrared emission from Nd^(3+)ions and Er^(3+)ions were investigated.The specimens kept amorphous status until the heat treatment duration extended to 10 hours,for Ga_(2)S_(3) nano-crystal formation in glass matrix.The stark splitting in visible upconversion luminescence center at 600 nm from Nd^(3+)ions weakened,and disappeared,and the shape of infrared emission centered at 1550 nm from Er^(3+)ions changed,with the heat treatment duration increased.The lifetime of Nd^(3+):^(4)F_(3/2) level and Er^(3+):^(4)I_(13/2) level dropped,then increased with heat treatment duration increased.X-ray diffraction patterns and transmission electron microscope images confirmed the amorphous state and Ga_(2)S_(3) nano-crystals formation in glass matrix.The rare earth ions local environment changes with heat treatment duration were proposed,based on the emission and lifetime changes.This research will be helpful for the understanding of rare earth doped chalcohalide crystallization mechanism and processes.展开更多
A series of alkali halide doped chalcohalide glasses （100-x）（0.9GeS2-0.1Sb2S3）-xCsCl （x=5, 10, 15 and 20 mole fraction） were prepared. The absorption spectra and Raman scatting spectra of these glasses were meas...A series of alkali halide doped chalcohalide glasses （100-x）（0.9GeS2-0.1Sb2S3）-xCsCl （x=5, 10, 15 and 20 mole fraction） were prepared. The absorption spectra and Raman scatting spectra of these glasses were measured. The optical band gaps Eopt were obtained from ultraviolet absorption edges. Z-scan technique was utilized to investigate the third-order nonlinear optical properties of GeS2-Sb2S3-CsCl glasses. The value of Eopt increases and the third-order optical nonlinearity decreases with increasing CsCl content. Decreasing lone-pair electron and broadening the band-gap will provide less transition paths for nonlinear process, which play a key role in ultrafast third-order nonlinear optical responses of these chalcohalide glasses.展开更多
The-homogeneous GeS2-In2 S3-CsI glassy samples were prepared by conventional melt-quenching method. When the molar ratio of In2 S3 to Csl remains 1, the non-crystalline region can extend to the composition 0.4GeS2-0.3...The-homogeneous GeS2-In2 S3-CsI glassy samples were prepared by conventional melt-quenching method. When the molar ratio of In2 S3 to Csl remains 1, the non-crystalline region can extend to the composition 0.4GeS2-0.3In2S3-0.3 CsI. And with the addition of CsI, the glass-forming ability of this serial glass reaches its maximum at the composition 0.8GeS2-0.1 In2 S3 -0.1CsI. According to the Raman spectra, the microstructure of these glasses is mainly constituted by [ GeS4 ] and [ InS4-xIx ] tetrahedra, which are interconnected by the bridging sulfur atoms ; meanwhile, the ethane-liked structural units [ S3 Ge-GeS3 ] can be formed because of the lacking of sulfur ; Cs ^＋ ion, which is added from CsI , exists as the nearest neighbor of I-ion in the glassy network.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
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 use...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
The thermal, physical and optical properties as well as chemical stability of Ag+ alloyed chalcohalide glasses in the Ge S2-Ga2S3-Ag I-Ag system were investigated via the Archimedes method, differential scanning calor...The thermal, physical and optical properties as well as chemical stability of Ag+ alloyed chalcohalide glasses in the Ge S2-Ga2S3-Ag I-Ag system were investigated via the Archimedes method, differential scanning calorimetry, infrared and visible transmission spectroscopy, respectively. The glass composition can be adjusted in a large range without any devitrification. These chalcohalide glasses are optically transparent in both visible and infrared regions. They also have an improved chemical stability in deionized water, compared to other chalcohalide glasses containing halides such as CsI.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Project supported by the National Natural Science Foundation of China (60878042, 60978058)Natural Science Foundation of Zhejiang Province (Y407253, Y1090996)K.C. Wong Magna Fund in Ningbo University
文摘A series of chalcohalide glasses based on the composition of 0.9（Ge30Ga5Se65）-0.1CsI with different Tm3＋/Dy3＋-codoped ions concentrations were synthesized by melt-quenching technique.The absorption spectra and 2.9 μm mid-infrared fluorescence spectra of glass samples under 800 nm laser excitation were measured.The results showed that Tm3＋ was an efficient sensitizer,which could enhance the Dy3＋： 2.9 μm fluorescence intensity significantly.The effective energy transfer between the two rare-earth ions were mainly attributed to the resonance energy transfer from Tm3＋：3F4 to Dy3＋：6H11/2 level.Emission cross section of 2.9 μm mid-infrared luminescence was also investigated according to Judd-Ofelt theory,σe=2.51×10–20 cm2.
文摘This paper reports the formation and some properties of a new class of chalcohalide glasses in the As2Tef iodide systems. The As2Te3-Pb12, As2Te3-HgI2, As2Te3-CitI and As2Te3-AgI systems can form stable bulk glasses in wide composition regions ?and no bulk glass formation was found in the As2Te3-TH sys-tem. As2Te3-based glasses have glass transition tempera-
基金Funded by the Opening Funding of the State Key Laboratory of Silicate Materials for Architecture(SYSJJ2018-06)the Fundamental Research Funds for the Central Universities(WUT:2016IVA096)China+1 种基金the Research Program(No.S2634339)through a Grant Provided by the Ministry of SMEs and Startupsthe Research on Advanced Optical Science and Technology through a Grant Funded by the GIST,Korea。
文摘Nd^(3+),Er^(3+)ions doped 0.9(Ge_(0.25)Ga_(0.10)S_(0.65))-0.1CsBr chalcohalide glass were prepared via melt-quenching method,and heat treated at 360℃ in high purity Ar gas atmosphere for different hours for the early stage of crystallization.The effect of heat treatment durations on visible upconversion luminescence and near infrared emission from Nd^(3+)ions and Er^(3+)ions were investigated.The specimens kept amorphous status until the heat treatment duration extended to 10 hours,for Ga_(2)S_(3) nano-crystal formation in glass matrix.The stark splitting in visible upconversion luminescence center at 600 nm from Nd^(3+)ions weakened,and disappeared,and the shape of infrared emission centered at 1550 nm from Er^(3+)ions changed,with the heat treatment duration increased.The lifetime of Nd^(3+):^(4)F_(3/2) level and Er^(3+):^(4)I_(13/2) level dropped,then increased with heat treatment duration increased.X-ray diffraction patterns and transmission electron microscope images confirmed the amorphous state and Ga_(2)S_(3) nano-crystals formation in glass matrix.The rare earth ions local environment changes with heat treatment duration were proposed,based on the emission and lifetime changes.This research will be helpful for the understanding of rare earth doped chalcohalide crystallization mechanism and processes.
基金supported by the National Ba-sic Research Program of China ("973 Project", (No2006CB708607)the Science and Technology Department of Zhejiang Province, China (No 2006C11127)+1 种基金the Science and Technology Foundation of Ningbo, China (No2006B100068)the Natural Science Foundation of Ningbo, China (Nos 2006A610056, 2007A610004)
文摘A series of alkali halide doped chalcohalide glasses （100-x）（0.9GeS2-0.1Sb2S3）-xCsCl （x=5, 10, 15 and 20 mole fraction） were prepared. The absorption spectra and Raman scatting spectra of these glasses were measured. The optical band gaps Eopt were obtained from ultraviolet absorption edges. Z-scan technique was utilized to investigate the third-order nonlinear optical properties of GeS2-Sb2S3-CsCl glasses. The value of Eopt increases and the third-order optical nonlinearity decreases with increasing CsCl content. Decreasing lone-pair electron and broadening the band-gap will provide less transition paths for nonlinear process, which play a key role in ultrafast third-order nonlinear optical responses of these chalcohalide glasses.
基金Funded by the National Natural Science Foundation of China(No.50125205) ,the Opening Fund of Key Laboratory of SilicateMaterials Science and Engineering ( Wuhan University of Technolo-gy) , Ministry of Education (No.SYSJJ2004-14)
文摘The-homogeneous GeS2-In2 S3-CsI glassy samples were prepared by conventional melt-quenching method. When the molar ratio of In2 S3 to Csl remains 1, the non-crystalline region can extend to the composition 0.4GeS2-0.3In2S3-0.3 CsI. And with the addition of CsI, the glass-forming ability of this serial glass reaches its maximum at the composition 0.8GeS2-0.1 In2 S3 -0.1CsI. According to the Raman spectra, the microstructure of these glasses is mainly constituted by [ GeS4 ] and [ InS4-xIx ] tetrahedra, which are interconnected by the bridging sulfur atoms ; meanwhile, the ethane-liked structural units [ S3 Ge-GeS3 ] can be formed because of the lacking of sulfur ; Cs ^＋ ion, which is added from CsI , exists as the nearest neighbor of I-ion in the glassy network.
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.
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.
基金supported by National Science Foundation of China (Grant No. 51072052)Postdoctoral Fund (No. 51302082)
文摘The thermal, physical and optical properties as well as chemical stability of Ag+ alloyed chalcohalide glasses in the Ge S2-Ga2S3-Ag I-Ag system were investigated via the Archimedes method, differential scanning calorimetry, infrared and visible transmission spectroscopy, respectively. The glass composition can be adjusted in a large range without any devitrification. These chalcohalide glasses are optically transparent in both visible and infrared regions. They also have an improved chemical stability in deionized water, compared to other chalcohalide glasses containing halides such as CsI.
