The erbium ions at energy of 400 keV and dose of 5× 10^15 ions/cm^2 were implanted into silicon single crystals at room temperature at the angles of 0°,45° and 60°. The lateral spread of 400 keV er...The erbium ions at energy of 400 keV and dose of 5× 10^15 ions/cm^2 were implanted into silicon single crystals at room temperature at the angles of 0°,45° and 60°. The lateral spread of 400 keV erbium ions implanted in silicon sample was measured by the Rutherford backscattering technique. The results show that the measured values were in good agreement with those obtained from the prediction of TRIM＇98 （Transport of Ions in Matter） and SRIM2006 （Stopping and Range of Ions in Matter） codes.展开更多
Calcium fluoride nanoparticles with various amounts of erbium ion dopants were prepared by CTAB/C_4 H_9OH/C_7H_(16)/H_2O reverse micro-emulsion method.The nanoparticles were studied by X-ray diffraction(XRD),transmiss...Calcium fluoride nanoparticles with various amounts of erbium ion dopants were prepared by CTAB/C_4 H_9OH/C_7H_(16)/H_2O reverse micro-emulsion method.The nanoparticles were studied by X-ray diffraction(XRD),transmission electron microscopy(TEM),fourier transform infrared spectroscopy(FTIR),absorption and fluorescence spectra.The XRD patterns indicate a typical cubic fluorite structure and no other impurities.TEM results show the synthesized particles having uniform grain size and without agglomeration.FTIR spectra reveal that there are some amounts of-OH,NO_3^-and other organic functional groups on the particle surfaces before the annealing process.Many absorption peaks and bands are present in the absorption spectra,corresponding to the rich energy levels of erbium ion.The Red-Shift of absorption bands and Blue-Shift of fluorescence peaks can be attributed to the weakened energy level split as a result of the decrease in crystal field strength.展开更多
The new Er3+, Ho3+ and Tm3+ doped gadolinium oxysulfide phosphors with the long afterglow emission were synthesized by solid-state reaction method. The synthesized phosphors were characterized by X-ray diffraction. Th...The new Er3+, Ho3+ and Tm3+ doped gadolinium oxysulfide phosphors with the long afterglow emission were synthesized by solid-state reaction method. The synthesized phosphors were characterized by X-ray diffraction. The excitation and photoluminescence spectra, afterglow spectra and afterglow decay curve were examined by fluorescence spectroscopy. The afterglow spectra of Gd2O2S∶Er3+, Mg, Ti showed typical transitions of Er3+ at 528 (2H11/2 → 4I15/2),548 (4S3/2 → 4I15/2) and 669 nm (4F9/2 → 4I15/2). In the afterglow spectra of Gd2O2S∶ Ho3+, Mg, Ti, typical transitions of Ho3+ at 546 nm (5S2 → 5I8), 651 and 661 nm (5F5 → 5I8) were observed. In Gd2O2S∶Tm3+, Mg, Ti, the afterglow emission at 800 nm (1G4 → 3H5) of Tm3+ was seen. The mechnism and model of afterglow energy transfer were proposed.展开更多
Carbonate coprecipitate precursors were prepared by mixed nitrate solutions containing M2+(M2+=Sr2+,Ba2+),Y3+ and Er3+ as the cation sources and(NH4)2CO3 as the precipitator.MY2S4:Er3+ phosphors were synthesized by ca...Carbonate coprecipitate precursors were prepared by mixed nitrate solutions containing M2+(M2+=Sr2+,Ba2+),Y3+ and Er3+ as the cation sources and(NH4)2CO3 as the precipitator.MY2S4:Er3+ phosphors were synthesized by calcining the carbonate precursors with CS2 as the sulfurization reagent at 1050 ℃ for 4 h.XRD patterns show that the synthesized SrY2S4 and BaY2S4 crystalline powders possess the orthorhombic [CaFe2O4]-type structure.Photoluminescent measurements indicate that there were mainly red emitting(4F9/2→4I15/2) and green emitting(2H11/2→4I15/2 and 4S3/2→4I15/2) of Er3+ in the SrY2S4 while there was only red emitting(4F9/2→4I15/2) in BaY2S4:Er3+.BaY2S4:Er3+ is considered as a novel red phosphor candidate with a high monochromaticity.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 10975094 and 10735070)the National Basic Research Program of China (Grant No. 2010CB832906)+1 种基金Program for New Century Excellent Talents in University,Ministry of Education of China (Grant No. NCET-07-0516)the Foundation for the Author of National Excellent Doctoral Dissertation of China (Grant No. 10422-2007B1)
文摘The erbium ions at energy of 400 keV and dose of 5× 10^15 ions/cm^2 were implanted into silicon single crystals at room temperature at the angles of 0°,45° and 60°. The lateral spread of 400 keV erbium ions implanted in silicon sample was measured by the Rutherford backscattering technique. The results show that the measured values were in good agreement with those obtained from the prediction of TRIM＇98 （Transport of Ions in Matter） and SRIM2006 （Stopping and Range of Ions in Matter） codes.
基金funded by the National Natural Science Foundation of China(NO.51072144)State Key Laboratory of Advanced Technology for Materials Synthesis and Processing(Wuhan University of Technology)(NO.2009-ZT-1)
文摘Calcium fluoride nanoparticles with various amounts of erbium ion dopants were prepared by CTAB/C_4 H_9OH/C_7H_(16)/H_2O reverse micro-emulsion method.The nanoparticles were studied by X-ray diffraction(XRD),transmission electron microscopy(TEM),fourier transform infrared spectroscopy(FTIR),absorption and fluorescence spectra.The XRD patterns indicate a typical cubic fluorite structure and no other impurities.TEM results show the synthesized particles having uniform grain size and without agglomeration.FTIR spectra reveal that there are some amounts of-OH,NO_3^-and other organic functional groups on the particle surfaces before the annealing process.Many absorption peaks and bands are present in the absorption spectra,corresponding to the rich energy levels of erbium ion.The Red-Shift of absorption bands and Blue-Shift of fluorescence peaks can be attributed to the weakened energy level split as a result of the decrease in crystal field strength.
文摘The new Er3+, Ho3+ and Tm3+ doped gadolinium oxysulfide phosphors with the long afterglow emission were synthesized by solid-state reaction method. The synthesized phosphors were characterized by X-ray diffraction. The excitation and photoluminescence spectra, afterglow spectra and afterglow decay curve were examined by fluorescence spectroscopy. The afterglow spectra of Gd2O2S∶Er3+, Mg, Ti showed typical transitions of Er3+ at 528 (2H11/2 → 4I15/2),548 (4S3/2 → 4I15/2) and 669 nm (4F9/2 → 4I15/2). In the afterglow spectra of Gd2O2S∶ Ho3+, Mg, Ti, typical transitions of Ho3+ at 546 nm (5S2 → 5I8), 651 and 661 nm (5F5 → 5I8) were observed. In Gd2O2S∶Tm3+, Mg, Ti, the afterglow emission at 800 nm (1G4 → 3H5) of Tm3+ was seen. The mechnism and model of afterglow energy transfer were proposed.
文摘Carbonate coprecipitate precursors were prepared by mixed nitrate solutions containing M2+(M2+=Sr2+,Ba2+),Y3+ and Er3+ as the cation sources and(NH4)2CO3 as the precipitator.MY2S4:Er3+ phosphors were synthesized by calcining the carbonate precursors with CS2 as the sulfurization reagent at 1050 ℃ for 4 h.XRD patterns show that the synthesized SrY2S4 and BaY2S4 crystalline powders possess the orthorhombic [CaFe2O4]-type structure.Photoluminescent measurements indicate that there were mainly red emitting(4F9/2→4I15/2) and green emitting(2H11/2→4I15/2 and 4S3/2→4I15/2) of Er3+ in the SrY2S4 while there was only red emitting(4F9/2→4I15/2) in BaY2S4:Er3+.BaY2S4:Er3+ is considered as a novel red phosphor candidate with a high monochromaticity.
