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Now showing 1 - 7 of 7
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    The effect of In2O3 conductive coating on the luminescence and zeta potential of ZnS : Cu, Al phosphors
    (2005)
    Chang, CH
    ;
    Chiou, BS
    ;
    Chen, KS
    ;
    Ho, CC
    ;
    Ho, JC
    Phosphors used in CRTs have been coated with In2O3 conductive layer derived from the hydrolysis of indium chloride. It was found that brightness of the phosphors rises initially with the amount of InCl3, reaches a maximum at 10 Wt-% InCl3 and then decreases when more InCl3 was added. With 10 wt.% InCl3 coating, the brightness of ZnS:Cu, Al phosphor increases by 24% at 800 V and I RA while very little changes were observed in the luminescent emission peak and CIE color loci. The luminescence decay times increase with the increase of the conductive coating. However, they are shorter than 0.7 mu s for samples with the amount of coating ranging from 0 to 20 wt.% InCl3 and are Suitable for display applications. Conductive coating affects the surface chemistry of the phosphor particles, enhances the zeta potential of ZnS:Cu, Al in IPA solution. and, consequently, increases the electrophoretic deposition rate of the phosphors onto substrate. The zeta potential of 10 wt.% InCl3 coated ZnS:Cu, Al in isopropyl alcohol solution is 32 mV as compared to 1.2 mV of that of the uncoated ZnS:Cu, Al. Besides, the electrophoretic deposition rate of the 10 wt.% InCl3 coated ZnS:Cu, Al (0.23 mg/s) is larger than that of the uncoated phosphor (0.17 mg/s). (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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    Enhanced Light Harvesting with a Reflective Luminescent Down-Shifting Layer for Dye-Sensitized Solar Cells
    (2013-06-26)
    Hosseini, Zahra
    ;
    Huang, Wei-Kai
    ;
    Tsai, Cheng-Ming
    ;
    Chen, Teng-Ming
    ;
    Taghavinia, Nima
    For a dye-sensitized solar cell with a near-infrared squaraine (SQ1) sensitizer, the photovoltaic performance was enhanced remarkably with a reflective luminescent down-shifting (R-LDS) layer to increase the light-harvesting efficiency at the wavelength region 400-550 nm where the SQ1 dye has weak absorption. Relative enhancements greater than 200% in IPCE near 500 nm and 40-54% in J(SC) were achieved with red phosphor CaAlSiN3:Eu2+ as the LDS material, attaining 5.0 and 4.8% overall efficiencies of power conversion for the R-LDS layer coated on the counter electrode (front illumination) and working electrode (back illumination), respectively.
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    Vacuum ultraviolet spectral investigations on green-emitting Ca (La, Gd)(4) Si3O13 : Tb3+ phosphors for PDP applications
    (2006-12-01)
    Wu Chia-Chin
    ;
    Cheng Bing-Ming
    ;
    Chen Teng-Ming
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    In an effort to develop new green-emitting PDP phosphors with high efficiency, investigated were the synthesis, VUV photoluminescence (PL) spectra, optical properties, and chromaticity of Ca(La1-x-yTbxGdy)(4)Si3O13 phosphors by using synchrotron radiation. Upon analysis of the VUV spectroscopic and chromaticity investigations on the new green-emitting VUV phosphors, were an optimized composition achieved. The PLE spectral studies show that Ca(La1-x-y TbxGdy)(4)Si3O13 exhibit significant absorption in the VUV range. The VUV PL intensity was found to enhance with Gd3+ - doping. Furthermore, the 1931 CIE chromaticity coordinates of Ca(La,Gd)(4)Si3O13:Tb were found to be (0.286, 0.548), as compared to (0.230, 0.712) for Zn2SiO4:Mn2+ as a reference. The potential application of Ca(La,Gd)(4)Si3O13:Tb as a new green-emitting PDP phosphor are being currently improving and evaluating.
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    Structural, spectroscopic and photolurninescence studies of LiEu(WO4)(2-x)(MoO4), as a near-UV convertible phosphor
    (2007-02-01)
    Chiu, Chuang-Hung
    ;
    Wang, Ming-Fang
    ;
    Lee, Chi-Shen
    ;
    Chen, Teng-Ming
    ;
    應用化學系
    A series of lithium europium double tungsto-molybdate phosphors LiEu(WO4)(2-),(MoO4), (X = 0, 0.4, 0.8, 1.2, 1.6, 2.0) have been synthesized by solid-state reactions and their crystal structure, optical and luminescent properties were studied. As the molybdate content increases, the intensity of the D-5(0) -> F-7(2) emission of Eu3+ activated at wavelength of 396 mn was found to increase and reach a maximum when the relative ratio of Mo/W is 2:0. These changes were found to be accompanied with the changes in the spectral feature, which can be attributed to the crystal field splitting of the D-5(0) -> F-7(2) transition. As the molybdate content increases the emission intensity of the 615 nm peak also increases. The intense red-emission of the tungstomolybdate phosphors under near-UV excitation suggests them to be potential candidate for white light generation by using near-UV LEDs. In this study the effect of chemical compositions and crystal structure on the photolumineseent properties of LiEu(WO4)(2-x)(MoO4), is investigated and discussed. (c) 2006 Elsevier Inc. All rights reserved.
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    Synthesis, composition optimization, and VUV photoluminescence characterization of (Y,Gd) (V,P) O-4 : Eu3+ as a potential red-emitting plasma-display panel phosphor
    (2007-12-01)
    Wu, Chia-Chin
    ;
    Cheng, Bing-Ming
    ;
    Chen, Teng-Ming
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    The synthesis, composition optimization, VUV Photoluminescence (PL) spectra, and optical properties, of (Y, Gd) (V, P)O-4 : Eu3+ phosphors were investigated by synchrotron radiation. The VUV PLE spectra and the correlation among VUV PL intensity, lambda(em), and Eu3+, Gd3+, and P-content were established. The PLE spectral studies showed that (Y, Gd) (V, P)O-4: Eu3+ exhibited significant absorption in the VUV range. The VUV PL intensity was found to enhance with PO43- and Gd3+ -doping. Furthermore, the chromaticity characteristics of (Y, Gd) (V, P)O-4: Eu3+ were also found to be (0.6614, 0.3286) and compared against (Y, Gd)BO3:Eu3+ as a reference. Based on the characterization results, we are currently improving and evaluating the potential application of (Y, Gd) (V, P)O-4: Eu3+ as a new red-emitting PDP phosphor.
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    A lighting mechanism for flat electron emission lamp
    (2009-03-02)
    Li, Jung-Yu
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    Chen, Shih-Pu
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    Li, Chia-Hung
    ;
    Lin, Yi-Ping
    ;
    Chou, Yen-I
    We propose a lighting mechanism for generating uniform planar light. The device integrates electron beams induced by gas discharge with cathodoluminescence at the anode, where the spectra of the emitted light depend entirely on the phosphor materials coated on the anode. Consequently, ultraviolet is not required and the usage of mercury can be avoided. In addition, the features of double-side lighting, transparency, and gray-scale images indicate that the flat electron emission lamp might become potential candidate for the next generation green lighting source.
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    Visible quantum cutting in green-emitting BaGdF5 : Tb3+ phosphors via downconversion
    (2007-01-01)
    Tzeng, Hsin-Yi
    ;
    Cheng, Bing-Ming
    ;
    Chen, Teng-Ming
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    The visible quantum cutting (QC) under the excitation at 215 and 187nm in a newly discovered BaGdF5:Tb3+ via downconversion mechanism has been observed and investigated. We have measured the vacuum ultraviolet (VUV) excitation and emission spectra and proposed possible mechanisms to rationalize the observed QC effect. In QC process, one short-wavelength UV or one VUV photon absorbed by Tb3+ was found to split into more than one visible photon emitted by Tb3+ through cross-relaxation and subsequent direct energy transfer between Tb3+ and Tb3+ and/or Gd3+ ions, depending on the excitation wavelength. On the basis of the calculations from the emission spectra in the visible region obtained, we have obtained optimal quantum efficiency as high as 168% and 180% for green-emitting BaGdF5:Tb3+ under excitation at 215 and 187 nm, respectively. (c) 2006 Elsevier B.V. All rights reserved.