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Now showing 1 - 9 of 9

Synthesis and characterization of highly luminescent CuInS2 and CuInS2/ZnS (core/shell) nanocrystals
(2008-12-01)
Kuo, Kuan-Ting
;
Chen, San-Yuan
;
Cheng, Bing-Ming
;
Lin, Chin-Ching
;
材料科學與工程學系
High-quality CuInS2/ZnS (core-shell) nanocrystals (NCs) were synthesized via a colloidal solvent process and characterized for their optical properties by UV-vis, room temperature solution photoluminescence (PL) spectroscopy, and further obtained powders were characterized by X-ray microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and dynamic light scattering (DLS). diffraction (XRD), transmission electron The obtained CIS and CIS/ZnS core/shell NCs are quasimonodisperse with an average particle size of 2.4 and 4.6 nm, respectively. All of the as-synthesized NCs can be well dispersed in toluene or hexane to form stable and clear colloidal solutions, which show strong visible emission (blue for CIS/ZnS core/shell NCs) under UV excitation. The growth of a ZnS shell on CIS NCs, that is, the formation of CIS/ZnS core/shell NCs, resulted in an impact enhancement in the PL intensity compared to that of bare CIS NCs due to the eliminated surface defects and the reduced lattice mismatch between the core and shell materials. A dramatic increase of the PL intensity can be obtained from the ZnS-capped CIS with respect to that of the bare CIS NCs. (C) 2008 Elsevier B.V. All rights reserved.
Blue/near UV light emission from hybrid InN/TiO2 nanoparticle films
(2011-01-01)
Wu, Chih-Wei
;
Lu, Chih-Wei
;
Lee, Yuan-Pern
;
Wu, Yu-Jong
;
Cheng, Bing-Ming
We report on the enhancement of photoluminescence (PL) from anatase TiO2 thin films covered by InN nanoparticles prepared using plasma enhanced chemical vapor deposition (PECVD). The SEM images and X-ray diffraction spectra illustrate the strong interaction between the InN particles and the TiO2 films. UV-Vis absorption spectra indicate that the InN particles have an increased absorption in the visible light region and may sensitize the TiO2 films. The strong PL band observed in the anatase TiO2 thin films with the addition of InN may have been due to an increased localization of impurities and/or defect-trapped excitons.
Charge-Transfer Luminescence and Energy Transfer in Eu2+-Doped Barium Zirconosilicates
(2011-01-01)
Wang, De-Yin
;
Wang, Ling-Li
;
Lee, Te-Ju
;
Chen, Teng-Ming
;
Cheng, Bing-Ming
Although zirconates are known to show ultraviolet luminescence under X-ray excitation, few have studied the vacuum ultraviolet (VUV) excited luminescence of zirconate compounds. We have investigated the VUV-excited luminescence of zirconate in BaZrSi3O9 and Ba2Zr2Si3O12 using synchrotron radiation, and examined the possibility of sensitizing Eu2+ by hosts that contain zirconate. Upon VUV excitation, BaZrSi3O9 and Ba2Zr2Si3O12 show self-activated emission peaking at 285 nm and 334 nm, which are assigned to Zr4+-O2- charge transfer (CT) luminescence. The evidence for the occurrence of Zr4+-O2- charge transfer in BaZrSi3O9 and Ba2Zr2Si3O12 was further supported by density of state (DOS) calculation. Energy transfer from host excitation (similar to 172 nm) to Eu2+ was observed in BaZrSi3O9:Eu2+ and Ba2Zr2Si3O12:Eu2+, showing that host sensitization of Eu2+ occurs in these materials. Despite that the host emission overlaps with the Eu2+ 4f-5d absorption band significantly, host -to-Eu2+ energy transfer in Ba2Zr2Si3O12:Eu2+ was found to be less efficient than that in BaZrSi3O9:Eu2+ and Eu2+ luminescence was found to be inferior in Ba2Zr2Si3O12:Eu2+. These observations are ascribed to a smaller Zr-O-Ba(Eu) angles and a lower Eu2+-Zr4+ metal-to-metal charge transfer energy in Ba2Zr2Si3O12:Eu2+. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.008112jes] All rights reserved.
Blue/near UV light emission from hybrid InN/TiO(2) nanoparticle films
(2011-01-01)
Wu, Chih-Wei
;
Lu, Chih-Wei
;
Lee, Yuan-Pern
;
Wu, Yu-Jong
;
Cheng, Bing-Ming
We report on the enhancement of photoluminescence (PL) from anatase TiO(2) thin films covered by InN nanoparticles prepared using plasma enhanced chemical vapor deposition (PECVD). The SEM images and X-ray diffraction spectra illustrate the strong interaction between the InN particles and the TiO(2) films. UV-Vis absorption spectra indicate that the InN particles have an increased absorption in the visible light region and may sensitize the TiO(2) films. The strong PL band observed in the anatase TiO(2) thin films with the addition of InN may have been due to an increased localization of impurities and/or defect-trapped excitons.
Charge Transfer Luminescence of Several Zirconium-Containing Compounds Using Synchrotron Radiation
(2011)
Wang, De-Yin
;
Chen, Teng-Ming
;
Cheng, Bing-Ming
;
應用化學系
;
Department of Applied Chemistry
Photoluminescence properties of pristine and Eu(2+)-doped zirconates, viz. BaZr(PO(4))(2), BaZr(4)(PO(4))(6), Ba(2)Zr(2)Si(3)O(12), and Ca(3)ZrSi(2)O(9), excited by vacuum ultraviolet (VUV) light using synchrotron radiation were studied. The undoped zirconates show self-activated emission in the 300-340 nm region under VUV excitation, which is ascribed to the Zr(4+)-O(2-) charge transfer luminescence. Upon doping Eu(2+) into these compounds, no Eu(2+) emission was observed in the rest of compounds, except for a weak Eu(2+) emission observed in Ba(2)Zr(2)Si(3)O(12):Eu(2+). The quenching of Eu(2+) luminescence is rationalized as the presence of Zr(4+)-Eu(2+) metal-metal charge transfer. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3605475] All rights reserved.
Synthesis and photoluminescence properties of (Ca,Ln)(3)(PO4)(2)center dot(Ln(3+) = Tm3+ or Ce3+) phosphors under VUV excitation
(2011-03-01)
Wu, Chia-Chin
;
Cheng, Bing-Ming
;
Chen, Teng-Ming
;
應用化學系
;
Department of Applied Chemistry
(Ca,Ln)(3)(PO4)(2)center dot(Ln(3+) = TM3+ or Ce3+) phosphors were synthesized by a solid-state method, and the VUV photoluminescence (PL) spectra, optical properties, and chromaticity of phosphate phosphors are investigated in this paper using synchrotron radiation. The concentrations of the two activators are both 1 mole%. From the PLE spectra, (Ca,Ln)(3)(PO4)(2)center dot(Ln(3+) = TM3+ or Ce3+) absorbs in the VUV region and emits light in the UV (Tm3+, Ce3+), purple (Ce3+), and blue (Tm3+) regions. Moreover, the 1931 CIE chromaticity coordinates of (Ca0.99Tm0.01)(3)(PO4) were found to be (0.1463, 0.0613), as (0.1664, 0.0482) for (Ca0.99Ce0.01)(3)(PO4).
Charge-Transfer Luminescence and Energy Transfer in Eu(2+)-Doped Barium Zirconosilicates
(2011-01-01)
Wang, De-Yin
;
Wang, Ling-Li
;
Lee, Te-Ju
;
Chen, Teng-Ming
;
Cheng, Bing-Ming
Although zirconates are known to show ultraviolet luminescence under X-ray excitation, few have studied the vacuum ultraviolet (VUV) excited luminescence of zirconate compounds. We have investigated the VUV-excited luminescence of zirconate in BaZrSi(3)O(9) and Ba(2)Zr(2)Si(3)O(12) using synchrotron radiation, and examined the possibility of sensitizing Eu(2+) by hosts that contain zirconate. Upon VUV excitation, BaZrSi(3)O(9) and Ba(2)Zr(2)Si(3)O(12) show self-activated emission peaking at 285 nm and 334 nm, which are assigned to Zr(4+)-O(2-) charge transfer (CT) luminescence. The evidence for the occurrence of Zr(4+)-O(2-) charge transfer in BaZrSi(3)O(9) and Ba(2)Zr(2)Si(3)O(12) was further supported by density of state (DOS) calculation. Energy transfer from host excitation (similar to 172 nm) to Eu(2+) was observed in BaZrSi(3)O(9):Eu(2+) and Ba(2)Zr(2)Si(3)O(12):Eu(2+), showing that host sensitization of Eu(2+) occurs in these materials. Despite that the host emission overlaps with the Eu(2+) 4f-5d absorption band significantly, host -to-Eu(2+) energy transfer in Ba(2)Zr(2)Si(3)O(12):Eu(2+) was found to be less efficient than that in BaZrSi(3)O(9):Eu(2+) and Eu(2+) luminescence was found to be inferior in Ba(2)Zr(2)Si(3)O(12):Eu(2+). These observations are ascribed to a smaller Zr-O-Ba(Eu) angles and a lower Eu(2+)-Zr(4+) metal-to-metal charge transfer energy in Ba(2)Zr(2)Si(3)O(12):Eu(2+). (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.008112jes] All rights reserved.
Synthesis and characterization of highly luminescent CuInS(2) and CuInS(2)/ZnS (core/shell) nanocrystals
(2008-12-01)
Kuo, Kuan-Ting
;
Chen, San-Yuan
;
Cheng, Bing-Ming
;
Lin, Chin-Ching
;
材料科學與工程學系
High-quality CuInS(2)/ZnS (core-shell) nanocrystals (NCs) were synthesized via a colloidal solvent process and characterized for their optical properties by UV-vis, room temperature solution photoluminescence (PL) spectroscopy, and further obtained powders were characterized by X-ray microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and dynamic light scattering (DLS). diffraction (XRD), transmission electron The obtained CIS and CIS/ZnS core/shell NCs are quasimonodisperse with an average particle size of 2.4 and 4.6 nm, respectively. All of the as-synthesized NCs can be well dispersed in toluene or hexane to form stable and clear colloidal solutions, which show strong visible emission (blue for CIS/ZnS core/shell NCs) under UV excitation. The growth of a ZnS shell on CIS NCs, that is, the formation of CIS/ZnS core/shell NCs, resulted in an impact enhancement in the PL intensity compared to that of bare CIS NCs due to the eliminated surface defects and the reduced lattice mismatch between the core and shell materials. A dramatic increase of the PL intensity can be obtained from the ZnS-capped CIS with respect to that of the bare CIS NCs. (C) 2008 Elsevier B.V. All rights reserved.
FORMATION AND IDENTIFICATION OF INTERSTELLAR MOLECULE LINEAR C(5)H FROM PHOTOLYSIS OF METHANE DISPERSED IN SOLID NEON
(2009-08-10)
Wu, Yu-Jong
;
Chen, Hui-Fen
;
Camacho, Cristopher
;
Witek, Henryk A.
;
Hsu, Sheng-Chuan
Photolysis of methane dispersed (1/1000) in solid Ne at 3 K with vacuum-ultraviolet light from a synchrotron produced infrared absorption lines of several products, including new lines at 3319.3 and 1955.5 cm(-1). Based on experiments with isotopic labeling and results of quantum-chemical calculations, these lines are assigned to the C-H stretching and C=C stretching modes, respectively, of interstellar molecule linear C(5)H radicals.

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