yb^3+:Er^3+ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3+ was discussed, and the temperature properties of green up-conversion fluorescence between 30...yb^3+:Er^3+ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3+ was discussed, and the temperature properties of green up-conversion fluorescence between 303 and 823 K were investigated. The results show that the sensitivity of this sample reaches its maximum value, about 0.0047 K^-1, when the temperature is 383 K, indicating that this kind of sample can be used as high temperature and high sensitivity optical temperature sensor.展开更多
Er^3 +/Yb^3 + phosphate glasses were fabricated. According to McCumber theory, the stimulated emission cross-section of Er^3+ ions at 1533 nm was calculated on the basis of absorption spectrum, and 0.84 × 10^-...Er^3 +/Yb^3 + phosphate glasses were fabricated. According to McCumber theory, the stimulated emission cross-section of Er^3+ ions at 1533 nm was calculated on the basis of absorption spectrum, and 0.84 × 10^-20 cm^2 is derived, the fluorescence lifetime of ^4I13/2 level is 8.5 ms. An Er^3+/Yb^3+ co-doped phosphate glass CW laser pumped by LD was demonstrated at room temperature. The maximum output power is 80 mW and slope efficiency is 16.5%.展开更多
The Er^3+/yb^3+ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy (TEM) images showed that CaF2 nano-...The Er^3+/yb^3+ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy (TEM) images showed that CaF2 nano-crystals of 20-30 nm in diameter precipitated uniformly in the glass matrix. luminescence of Er^3+ at 540 nm and 658 nm was observed in Comparing with the host glass, high efficiency upconversion the glass ceramics under the excitation of 980 nm. Moreover, the size of the precipitated nano-crystals can be controlled by heat-treatment temperature and time. With the increase of the nano-crystal size, the intensity of the red emission increased more rapidly than that of the green emission. The energy transfer process of Er^3+ and Yb^3+ was convinced and the possible mechanism of Er^3+ up-conversion was discussed.展开更多
Yb^3+:Er^3+:Tm^3+co-doped borosilicate glasses are prepared. Their strong up-conversion photoluminescence spectra in a range from ultra-violet to near-infrared, which are excited by a 978-nm laser diode, are meas...Yb^3+:Er^3+:Tm^3+co-doped borosilicate glasses are prepared. Their strong up-conversion photoluminescence spectra in a range from ultra-violet to near-infrared, which are excited by a 978-nm laser diode, are measured, and the mechanisms of energy transfer among Yb^3+ Er^3+ and Tm^3+ ions are discussed. The results show that there is an unexpected wavelength at 900-nm emission from Yb^3+ Stark splitting levels to pump Tm^3+ ions and there exists an optimum pump power. The concentration of the Tm^3+ dopant gives rise to a prominent effect on the intensity of visible and near-infrared emissions for the yb^3+:Er^3+:Tm^3+ co-doped borosilicate glasses.展开更多
This study presented the luminescence properties of Nd^3+/Yb^3+/Ho^3+ dopant ions inside a host based on Ga_2O_3-GeO_2-Li_2O(GGL) glass. The measured differential scanning calorimetry result showed that GGL glass...This study presented the luminescence properties of Nd^3+/Yb^3+/Ho^3+ dopant ions inside a host based on Ga_2O_3-GeO_2-Li_2O(GGL) glass. The measured differential scanning calorimetry result showed that GGL glass exhibited excellent stability against devitrification with ?T=135 oC. Obvious 543 and 657 nm emissions were observed in Nd^3+/Ho^3+-codoped sample. The incorporation of Yb^3+ into Nd^3+/Ho^3+-codoped glass system had resulted in enhanced upconversion emission intensity under the excitation of 808 nm and/or 980 nm laser diode(LD). The possible mechanisms and related discussions on this phenomenon were presented. It was noted that the presence of Yb^3+ yielded an enhancement about 7 and 11 times in the 543 and 657 nm emission intensities respectively under 808 nm excitation due to the energy transfer from Nd^3+ to Ho^3+ via Yb^3+ ion. Here Yb^3+ played a major role as a bridging ion. While enhanced 543 and 657 nm emission intensities under the excitation of 980 nm LD originated from the sensitization effect of Yb^3+. Our results showed that Nd^3+/Ho^3+/Yb^3+ triply doped GGL glass might be a promising candidate for the development of visible-laser materials.展开更多
The Er3+/yb3+ co-doped phosphate (EYDP) glass waveguides operated at 1539 nm have been manufactured by using the implantation technique of carbon ions under the condition of 6.0 MeV energy and 5.0 × 10^13 ion...The Er3+/yb3+ co-doped phosphate (EYDP) glass waveguides operated at 1539 nm have been manufactured by using the implantation technique of carbon ions under the condition of 6.0 MeV energy and 5.0 × 10^13 ions/cm2 fluence in this work. The ion implantation process was computed by means of the stopping and range of ions in matter. The dark-mode spectrum at 1539 nm of the waveguide was recorded by the method of the prism coupling measurement. The microscopic image of the fabricated structure was photographed by an optical microscope. It is the first step for the application of the waveguides on the base of EYDP glasses in optical- integrated photonic devices at near-infrared band.展开更多
yb^3+-Er^3+ co-doped Na20-Al2O3-SiO2-P2O5 glasses with different SiO2 content have been fabricated and characterized. Absorption and emission spectra were measured. Judd-Ofelt theory and McCumber theory are performe...yb^3+-Er^3+ co-doped Na20-Al2O3-SiO2-P2O5 glasses with different SiO2 content have been fabricated and characterized. Absorption and emission spectra were measured. Judd-Ofelt theory and McCumber theory are performed to analyze the measured absorption spectra. The Judd-Ofelt intensity parameters Ω4 and Ω6 decrease with increasing SiO2 content. The emission cross-section of Er^3+ decreases from 0.82×10^-20cm^2 to 0.76 × 10^-20cm^2 as the SiO2 content varies from 0 to 20 mol%.展开更多
Er^3+/Yb^3+ co-doped SrY2O4 phosphors with high color purity and brightness were successfully synthesized via a solid-state reaction method.Luminescence spectrum studies showed that the main red peaks and the minor ...Er^3+/Yb^3+ co-doped SrY2O4 phosphors with high color purity and brightness were successfully synthesized via a solid-state reaction method.Luminescence spectrum studies showed that the main red peaks and the minor green peaks of upconversion emissions were located at approximately 634–681 nm and 543–570 nm,respectively,corresponding to the transitions of ~4F(9/2)→~4I(15/2) and ~4S(3/2)→~4I(15/2) of Er^3+ ions.Under the excitation of 980 and 1550 nm lasers,the spectra of all of the samples exhibited similar peak positions but different intensities.When excited by the 980 nm laser,the intensity ratio of red to green emission increased with increasing Yb^3+ doping concentration and decreased with increasing excitation power.In the case of 1550 nm excitation,the intensity ratio of red to green emission increased with increasing Yb^3+ doping concentration and excitation power,thereby,improving the color purity of the red emission.The intensity of red emission was considerably stronger under 1550 nm excitation than that under 980 nm excitation.Therefore,the color of the proposed phosphors could be efficiently tuned by tailoring both the Yb^3+ doping concentration and excitation power.展开更多
The widely used energy transfer theory is a foundation of luminescence, in which the rates of Stokes and anti-Stokes processes have the same calculation formula. An improvement on the anti-Stokes energy transfer to ex...The widely used energy transfer theory is a foundation of luminescence, in which the rates of Stokes and anti-Stokes processes have the same calculation formula. An improvement on the anti-Stokes energy transfer to explain the fluorescence intensity reversal between the red and green fluorescence of Er(0.5)Yb(9.5):FOV is reported in the present article. The range of the intensity reversal Z was measured to be 877. Dynamic processes for 16 levels were simulated. A coefficient, the improvement factor of the intensity ratio of Stokes to anti-Stokes processes in quantum Raman theory compared to classical Raman theory, is introduced to successfully describe the anti-Stokes energy transfer. A new method to calculate the distance between the rare earth ions, which is critical for the energy transfer calculation, is proposed. The validity of these important improvements is also proved by experiment.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 10804015 )the Science Foundation of the Education Department of Liaoning Province of China (Grant No. 2009A417)
文摘yb^3+:Er^3+ co-doped oxy-fluoride ceramics glass has been prepared. The mechanism of up-conversion emissions about Er^3+ was discussed, and the temperature properties of green up-conversion fluorescence between 303 and 823 K were investigated. The results show that the sensitivity of this sample reaches its maximum value, about 0.0047 K^-1, when the temperature is 383 K, indicating that this kind of sample can be used as high temperature and high sensitivity optical temperature sensor.
文摘Er^3 +/Yb^3 + phosphate glasses were fabricated. According to McCumber theory, the stimulated emission cross-section of Er^3+ ions at 1533 nm was calculated on the basis of absorption spectrum, and 0.84 × 10^-20 cm^2 is derived, the fluorescence lifetime of ^4I13/2 level is 8.5 ms. An Er^3+/Yb^3+ co-doped phosphate glass CW laser pumped by LD was demonstrated at room temperature. The maximum output power is 80 mW and slope efficiency is 16.5%.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61265004,51272097,and 11204113)the Nature and Science Fund from Yunnan Province Ministry of Education,China(Grant No.2011C13211708)
文摘The Er^3+/yb^3+ co-doped transparent oxyfluoride glass-ceramics containing CaF2 nano-crystals were successfully prepared. After heat treatments, transmission electron microscopy (TEM) images showed that CaF2 nano-crystals of 20-30 nm in diameter precipitated uniformly in the glass matrix. luminescence of Er^3+ at 540 nm and 658 nm was observed in Comparing with the host glass, high efficiency upconversion the glass ceramics under the excitation of 980 nm. Moreover, the size of the precipitated nano-crystals can be controlled by heat-treatment temperature and time. With the increase of the nano-crystal size, the intensity of the red emission increased more rapidly than that of the green emission. The energy transfer process of Er^3+ and Yb^3+ was convinced and the possible mechanism of Er^3+ up-conversion was discussed.
基金Project supported by the National Natural Science Foundation of China (Grant No. 10804015)the Science Foundation of the Education Department of Liaoning Province of China (Grant No. 2009A417)
文摘Yb^3+:Er^3+:Tm^3+co-doped borosilicate glasses are prepared. Their strong up-conversion photoluminescence spectra in a range from ultra-violet to near-infrared, which are excited by a 978-nm laser diode, are measured, and the mechanisms of energy transfer among Yb^3+ Er^3+ and Tm^3+ ions are discussed. The results show that there is an unexpected wavelength at 900-nm emission from Yb^3+ Stark splitting levels to pump Tm^3+ ions and there exists an optimum pump power. The concentration of the Tm^3+ dopant gives rise to a prominent effect on the intensity of visible and near-infrared emissions for the yb^3+:Er^3+:Tm^3+ co-doped borosilicate glasses.
基金Project supported by the National Natural Science Foundation of China(51002070)Foundation of He’nan Educational Committee(14A430034,16A430040)+1 种基金Funding Scheme for Young Teachers of Higher School in Henan Province(2012GGJS-192)the Science and Technology Program of Luoyang City(1401051A)
文摘This study presented the luminescence properties of Nd^3+/Yb^3+/Ho^3+ dopant ions inside a host based on Ga_2O_3-GeO_2-Li_2O(GGL) glass. The measured differential scanning calorimetry result showed that GGL glass exhibited excellent stability against devitrification with ?T=135 oC. Obvious 543 and 657 nm emissions were observed in Nd^3+/Ho^3+-codoped sample. The incorporation of Yb^3+ into Nd^3+/Ho^3+-codoped glass system had resulted in enhanced upconversion emission intensity under the excitation of 808 nm and/or 980 nm laser diode(LD). The possible mechanisms and related discussions on this phenomenon were presented. It was noted that the presence of Yb^3+ yielded an enhancement about 7 and 11 times in the 543 and 657 nm emission intensities respectively under 808 nm excitation due to the energy transfer from Nd^3+ to Ho^3+ via Yb^3+ ion. Here Yb^3+ played a major role as a bridging ion. While enhanced 543 and 657 nm emission intensities under the excitation of 980 nm LD originated from the sensitization effect of Yb^3+. Our results showed that Nd^3+/Ho^3+/Yb^3+ triply doped GGL glass might be a promising candidate for the development of visible-laser materials.
文摘The Er3+/yb3+ co-doped phosphate (EYDP) glass waveguides operated at 1539 nm have been manufactured by using the implantation technique of carbon ions under the condition of 6.0 MeV energy and 5.0 × 10^13 ions/cm2 fluence in this work. The ion implantation process was computed by means of the stopping and range of ions in matter. The dark-mode spectrum at 1539 nm of the waveguide was recorded by the method of the prism coupling measurement. The microscopic image of the fabricated structure was photographed by an optical microscope. It is the first step for the application of the waveguides on the base of EYDP glasses in optical- integrated photonic devices at near-infrared band.
基金Funded by the International Cooperation Project of Shanghai Municipal Science and Technology Commission (No.05S207103)
文摘yb^3+-Er^3+ co-doped Na20-Al2O3-SiO2-P2O5 glasses with different SiO2 content have been fabricated and characterized. Absorption and emission spectra were measured. Judd-Ofelt theory and McCumber theory are performed to analyze the measured absorption spectra. The Judd-Ofelt intensity parameters Ω4 and Ω6 decrease with increasing SiO2 content. The emission cross-section of Er^3+ decreases from 0.82×10^-20cm^2 to 0.76 × 10^-20cm^2 as the SiO2 content varies from 0 to 20 mol%.
基金Project supported by Research Program of Application Foundation(Main subject)of Ministry of Transport of China(2015329225090)Fundamental Research Funds for the Central Universities(3132014327,3132015150,3132015153,3132015139)+2 种基金Program for Liaoning Excellent Talents in University(LR2013020)Foundation of Liaoning Educational Committee(L2013201,L2014212,L2014208)the National Natural Science Foundation of China(11504039,51502031)
文摘Er^3+/Yb^3+ co-doped SrY2O4 phosphors with high color purity and brightness were successfully synthesized via a solid-state reaction method.Luminescence spectrum studies showed that the main red peaks and the minor green peaks of upconversion emissions were located at approximately 634–681 nm and 543–570 nm,respectively,corresponding to the transitions of ~4F(9/2)→~4I(15/2) and ~4S(3/2)→~4I(15/2) of Er^3+ ions.Under the excitation of 980 and 1550 nm lasers,the spectra of all of the samples exhibited similar peak positions but different intensities.When excited by the 980 nm laser,the intensity ratio of red to green emission increased with increasing Yb^3+ doping concentration and decreased with increasing excitation power.In the case of 1550 nm excitation,the intensity ratio of red to green emission increased with increasing Yb^3+ doping concentration and excitation power,thereby,improving the color purity of the red emission.The intensity of red emission was considerably stronger under 1550 nm excitation than that under 980 nm excitation.Therefore,the color of the proposed phosphors could be efficiently tuned by tailoring both the Yb^3+ doping concentration and excitation power.
基金Project supported by the National Natural Science Foundation of China (Grant No 10674019)
文摘The widely used energy transfer theory is a foundation of luminescence, in which the rates of Stokes and anti-Stokes processes have the same calculation formula. An improvement on the anti-Stokes energy transfer to explain the fluorescence intensity reversal between the red and green fluorescence of Er(0.5)Yb(9.5):FOV is reported in the present article. The range of the intensity reversal Z was measured to be 877. Dynamic processes for 16 levels were simulated. A coefficient, the improvement factor of the intensity ratio of Stokes to anti-Stokes processes in quantum Raman theory compared to classical Raman theory, is introduced to successfully describe the anti-Stokes energy transfer. A new method to calculate the distance between the rare earth ions, which is critical for the energy transfer calculation, is proposed. The validity of these important improvements is also proved by experiment.