The Experts below are selected from a list of 28815 Experts worldwide ranked by ideXlab platform
Hengzhen Shi - One of the best experts on this subject based on the ideXlab platform.
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luminescence properties of novel Yellowish green emitting phosphor kbabp2o8 tb3
Physica Status Solidi (a), 2014Co-Authors: Bing Han, Jie Zhang, Hengzhen ShiAbstract:A series of novel Yellowish-green-emitting K1+xBa1−2xTbxBP2O8 (0.02 ≤ x ≤ 0.15) phosphors were first synthesized by a high-temperature solid-state reaction method, and their phase purity as well as photoluminescence properties were investigated by X-ray diffraction (XRD) and fluorescence spectroscopy (FS) measurements, respectively. The influence of the doping concentration of Tb3+ on its relative emission intensity and decay behavior was systematically investigated. The critical distance as well as the concentration-quenching mechanism was calculated and confirmed. The as-prepared phosphor can be excited effectively with a 370 nm light, and exhibit Yellowish-green emission with a short decay time of the order of millisecond. The above work indicates this phosphor could be a potential candidate as a Yellowish-green-emitting phosphor for application in white-light-emitting diodes.
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photoluminescence properties of novel Yellowish orange emitting phosphor kbabp2o8 sm3
Materials Letters, 2014Co-Authors: Bing Han, Jie Zhang, Hengzhen ShiAbstract:Abstract A series of novel Yellowish orange emitting K1+xBa1−2xSmxBP2O8 (0.005≤x≤0.08) phosphors were first synthesized via a high-temperature solid-state reaction. The phase purity and photoluminescence properties were investigated by X-ray diffraction (XRD) and fluorescence spectroscopy (FS) measurements, respectively. The influence of the doping concentration of Sm3+ on its relative emission intensity and decay behavior was systematically investigated. The critical distance as well as concentration quenching mechanism was calculated and confirmed. The as-prepared phosphor can be effectively excited with a 402 nm light, and exhibit Yellowish orange emission with short decay time in the order of millisecond. The above work indicates this phosphor could be a potential candidate as Yellowish orange emitting phosphor for application in white light-emitting diodes.
Yanlin Huang - One of the best experts on this subject based on the ideXlab platform.
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a new Yellowish green emitting phosphor eu2 doped k4casi3o9
ChemInform, 2012Co-Authors: Beiling Yuan, Xigang Wang, Taiju Tsuboi, Yanlin HuangAbstract:The title phosphor is prepared by solid state reaction of a stoichiometric mixture of K2CO3, CaCO3, SiO2, and Eu2O3 with 1.0—5.0 mol% Eu2+ (850 °C for 10 h and 950 °C for 10 h mixed with active carbon).
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a new Yellowish green emitting phosphor eu2 doped k4casi3o9
Journal of Alloys and Compounds, 2012Co-Authors: Beiling Yuan, Xigang Wang, Taiju Tsuboi, Yanlin HuangAbstract:Abstract Eu 2+ -activated K 4 CaSi 3 O 9 phosphors were synthesized by conventional solid-state reaction. The phase formation was confirmed by X-ray powder diffraction measurements. The photoluminescence excitation and emission spectra were investigated. The phosphor presents bright Yellowish-green-emitting luminescence under the excitation of UV and near UV light. The luminescence absolute quantum efficiencies of the phosphors with different Eu 2+ -doping levels (1.0–5.0 mol%) were measured. The crystal structure and the site-occupancy of Eu 2+ ions doped in K 4 CaSi 3 O 9 crystal lattice were discussed. Two different Eu 2+ centers were assigned according to the crystal structure and the luminescence characteristics. The dependence of luminescence intensity on temperatures (25–150 °C) was measured. The chromaticity coordinates and activation energy (Δ E ) for thermal quenching were reported. The phosphor shows an excellent thermal stability on temperature quenching.
M Kottaisamy - One of the best experts on this subject based on the ideXlab platform.
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zno al a Yellowish orange emitting phosphor for blue light converted white light emitting diode wleds
Ceramics International, 2018Co-Authors: B Sundarakannan, M KottaisamyAbstract:Abstract Al-doped ZnO, which emits a Yellowish orange light at the excitation of blue light, is prepared by means of a sol-gel combustion method, using zinc acetate, aluminium nitrate, and urea as precursors. XRD analysis reveals that the obtained material shows hexagonal wurtzite structure of ZnO. This phosphor material is excitable in a wide range of wavelength from 350 to 500 nm with an excitation maximum at 470 nm. The concentration of Al varies from 5 mol% to 15 mol% with respect to Zn and a maximum photo-luminescent emission intensity is obtained at 15 mol%. At 455 nm excitation, Al-doped ZnO shows a broad band Yellowish orange emission starting from 470 to 620 nm with an emission maximum at 530 nm. At a blue LED excitation, it emits a warm white light with a CRI of 91 and CIE color co-ordinates of (x = 0.50, y = 0.39). This Al-doped ZnO can be used as a blue light converted Yellowish- orange emitting phosphor material for applications in WLEDs.
Bing Han - One of the best experts on this subject based on the ideXlab platform.
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luminescence properties of novel Yellowish green emitting phosphor kbabp2o8 tb3
Physica Status Solidi (a), 2014Co-Authors: Bing Han, Jie Zhang, Hengzhen ShiAbstract:A series of novel Yellowish-green-emitting K1+xBa1−2xTbxBP2O8 (0.02 ≤ x ≤ 0.15) phosphors were first synthesized by a high-temperature solid-state reaction method, and their phase purity as well as photoluminescence properties were investigated by X-ray diffraction (XRD) and fluorescence spectroscopy (FS) measurements, respectively. The influence of the doping concentration of Tb3+ on its relative emission intensity and decay behavior was systematically investigated. The critical distance as well as the concentration-quenching mechanism was calculated and confirmed. The as-prepared phosphor can be excited effectively with a 370 nm light, and exhibit Yellowish-green emission with a short decay time of the order of millisecond. The above work indicates this phosphor could be a potential candidate as a Yellowish-green-emitting phosphor for application in white-light-emitting diodes.
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photoluminescence properties of novel Yellowish orange emitting phosphor kbabp2o8 sm3
Materials Letters, 2014Co-Authors: Bing Han, Jie Zhang, Hengzhen ShiAbstract:Abstract A series of novel Yellowish orange emitting K1+xBa1−2xSmxBP2O8 (0.005≤x≤0.08) phosphors were first synthesized via a high-temperature solid-state reaction. The phase purity and photoluminescence properties were investigated by X-ray diffraction (XRD) and fluorescence spectroscopy (FS) measurements, respectively. The influence of the doping concentration of Sm3+ on its relative emission intensity and decay behavior was systematically investigated. The critical distance as well as concentration quenching mechanism was calculated and confirmed. The as-prepared phosphor can be effectively excited with a 402 nm light, and exhibit Yellowish orange emission with short decay time in the order of millisecond. The above work indicates this phosphor could be a potential candidate as Yellowish orange emitting phosphor for application in white light-emitting diodes.
Beiling Yuan - One of the best experts on this subject based on the ideXlab platform.
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a new Yellowish green emitting phosphor eu2 doped k4casi3o9
ChemInform, 2012Co-Authors: Beiling Yuan, Xigang Wang, Taiju Tsuboi, Yanlin HuangAbstract:The title phosphor is prepared by solid state reaction of a stoichiometric mixture of K2CO3, CaCO3, SiO2, and Eu2O3 with 1.0—5.0 mol% Eu2+ (850 °C for 10 h and 950 °C for 10 h mixed with active carbon).
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a new Yellowish green emitting phosphor eu2 doped k4casi3o9
Journal of Alloys and Compounds, 2012Co-Authors: Beiling Yuan, Xigang Wang, Taiju Tsuboi, Yanlin HuangAbstract:Abstract Eu 2+ -activated K 4 CaSi 3 O 9 phosphors were synthesized by conventional solid-state reaction. The phase formation was confirmed by X-ray powder diffraction measurements. The photoluminescence excitation and emission spectra were investigated. The phosphor presents bright Yellowish-green-emitting luminescence under the excitation of UV and near UV light. The luminescence absolute quantum efficiencies of the phosphors with different Eu 2+ -doping levels (1.0–5.0 mol%) were measured. The crystal structure and the site-occupancy of Eu 2+ ions doped in K 4 CaSi 3 O 9 crystal lattice were discussed. Two different Eu 2+ centers were assigned according to the crystal structure and the luminescence characteristics. The dependence of luminescence intensity on temperatures (25–150 °C) was measured. The chromaticity coordinates and activation energy (Δ E ) for thermal quenching were reported. The phosphor shows an excellent thermal stability on temperature quenching.
