We demonstrate the temperature-dependent fluorescence properties of Pr：LiGdF4 crystal tor the first time, to the best of our knowledge, and its blue diode pumped cw red laser at 720 nm at room temperature. The fluore...We demonstrate the temperature-dependent fluorescence properties of Pr：LiGdF4 crystal tor the first time, to the best of our knowledge, and its blue diode pumped cw red laser at 720 nm at room temperature. The fluorescence lifetime and polarized emission cross sections in the visible range are measured and calculated in a temperature range from 77K to 300 K, and the variations of the fluorescence lifetime and spectra are discovered. The reasons for these changes are explained accordingly. The output wavelength of the 720nm laser is first reported on the laser performance by using a fiber-coupled laser diode at the wavelength of 442nm as the pump source, and the maximum cw output power is about 303roW.展开更多
Red phosphor,with longer wavelength,is highly desirable for full-spectrum WLEDs.Targeted deep red phosphors(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)were designed from the initial model of SrLiAl_(3)N_(4):Eu^(2+)by structural ...Red phosphor,with longer wavelength,is highly desirable for full-spectrum WLEDs.Targeted deep red phosphors(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)were designed from the initial model of SrLiAl_(3)N_(4):Eu^(2+)by structural modification.The correlations among structural evolution,crystal-field environment,and luminescence properties were elucidated.Replacing Sr^(2+)with Gd^(3+)in(Sr,Gd)LiAl_(3)N_(4):Eu^(2+)leads to the enhanced crystal field splitting,larger Stokes shift,and increased structural polyhedron distortion differences,consequently resulting in spectral red-shift and broadening.For further spectral tuning,Mg,with lower electronegativity,was also introduced to modify the local crystal structure,consequently resulting in a further red-shift towards 675 nm and enhanced photoluminescence intensity in(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+).What’s more,w-LEDs were fabricated by using blue LED chip,blue,green,red and deep red((Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+))phosphors whose color rendering index were Ra 96.0 and R997.7.All above results demonstrate that the partial replacements of Sr^(2+)by Gd^(3+)and Al^(3+)by Mg^(2+)are effective methods for spectral modulation and(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)phosphors are suitable for highquality full-spectrum WLEDs.展开更多
Carbon dots(CDs)with long-wavelength absorptions and emissions are highly desired for biological applications.Herein,we report a new supra-CDs strategy to construct long-wavelength absorption bands based on fused CDs ...Carbon dots(CDs)with long-wavelength absorptions and emissions are highly desired for biological applications.Herein,we report a new supra-CDs strategy to construct long-wavelength absorption bands based on fused CDs aggregates(f-CDAs)through a concentration-induced interparticle dehydration process among green emissive CDs(r-CDs)under solvothermal treatment.The obtained fused f-CDAs exhibit an obvious absorption band in 550-700 nm and significantly enhanced deep red fluorescence in N,N-dimethylformamide with photoluminescence quantum yields of 15.6% and high photothermal conversion efficiency up to 26.1%in water.Benefiting from the high photothermal performance,in vivo tumor photothermal therapy has been realized via intratumoral injection of f-CDAs under 655 nm laser irradiated at 0.5 W/cm^(2).展开更多
目的:分析线粒体活性对人类精子活动力的影响。方法:以线粒体特异性荧光染料--mitotracker deep red 633(MTDR对不同活力的精子进行染色,然后用流式细胞术测定精子线粒体活性(即MTDR荧光强度值)。用雷帕霉素(rapamycin,RP)和羟氯喹(hydr...目的:分析线粒体活性对人类精子活动力的影响。方法:以线粒体特异性荧光染料--mitotracker deep red 633(MTDR对不同活力的精子进行染色,然后用流式细胞术测定精子线粒体活性(即MTDR荧光强度值)。用雷帕霉素(rapamycin,RP)和羟氯喹(hydroxychloroquineon,HCQ)调控精子活性水平,测定精子活动力的变化。结果:MTDR荧光强度值与前向运动速率(progressive motility,PR)不相关(r=0.182,P=0.268)。5 nmol/L和100 nmol/L的RP均可明显降低线粒体活性,50μmol/L HCQ可明显提高线粒体活性(P<0.05),但它们对精子活动力影响都不明显(P>0.05)。结论:线粒体活性对人类精子活力影响不明显。展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 51025210,51102156 and 51272131the Young and Middle-Aged Scientists Research Awards Fund of Shandong Province under Grant No BS2011CL024
文摘We demonstrate the temperature-dependent fluorescence properties of Pr：LiGdF4 crystal tor the first time, to the best of our knowledge, and its blue diode pumped cw red laser at 720 nm at room temperature. The fluorescence lifetime and polarized emission cross sections in the visible range are measured and calculated in a temperature range from 77K to 300 K, and the variations of the fluorescence lifetime and spectra are discovered. The reasons for these changes are explained accordingly. The output wavelength of the 720nm laser is first reported on the laser performance by using a fiber-coupled laser diode at the wavelength of 442nm as the pump source, and the maximum cw output power is about 303roW.
基金supported by the National Key Research and Development Program of China(2021YFB3500402)。
文摘Red phosphor,with longer wavelength,is highly desirable for full-spectrum WLEDs.Targeted deep red phosphors(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)were designed from the initial model of SrLiAl_(3)N_(4):Eu^(2+)by structural modification.The correlations among structural evolution,crystal-field environment,and luminescence properties were elucidated.Replacing Sr^(2+)with Gd^(3+)in(Sr,Gd)LiAl_(3)N_(4):Eu^(2+)leads to the enhanced crystal field splitting,larger Stokes shift,and increased structural polyhedron distortion differences,consequently resulting in spectral red-shift and broadening.For further spectral tuning,Mg,with lower electronegativity,was also introduced to modify the local crystal structure,consequently resulting in a further red-shift towards 675 nm and enhanced photoluminescence intensity in(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+).What’s more,w-LEDs were fabricated by using blue LED chip,blue,green,red and deep red((Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+))phosphors whose color rendering index were Ra 96.0 and R997.7.All above results demonstrate that the partial replacements of Sr^(2+)by Gd^(3+)and Al^(3+)by Mg^(2+)are effective methods for spectral modulation and(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)phosphors are suitable for highquality full-spectrum WLEDs.
基金National Natural Science Foundation of China,Grant/Award Number:61922091science and technology development fund of Macao SAR,Grant/Award Numbers:0040/2019/A1,0073/2019/AMJ,0011/2019/AKP,0128/2020/A3,0131/2020/A3University of Macao,Grant/Award Numbers:CPG2020-00026-IAPME,MYRG2019-00103-IAPME。
文摘Carbon dots(CDs)with long-wavelength absorptions and emissions are highly desired for biological applications.Herein,we report a new supra-CDs strategy to construct long-wavelength absorption bands based on fused CDs aggregates(f-CDAs)through a concentration-induced interparticle dehydration process among green emissive CDs(r-CDs)under solvothermal treatment.The obtained fused f-CDAs exhibit an obvious absorption band in 550-700 nm and significantly enhanced deep red fluorescence in N,N-dimethylformamide with photoluminescence quantum yields of 15.6% and high photothermal conversion efficiency up to 26.1%in water.Benefiting from the high photothermal performance,in vivo tumor photothermal therapy has been realized via intratumoral injection of f-CDAs under 655 nm laser irradiated at 0.5 W/cm^(2).
文摘目的:分析线粒体活性对人类精子活动力的影响。方法:以线粒体特异性荧光染料--mitotracker deep red 633(MTDR对不同活力的精子进行染色,然后用流式细胞术测定精子线粒体活性(即MTDR荧光强度值)。用雷帕霉素(rapamycin,RP)和羟氯喹(hydroxychloroquineon,HCQ)调控精子活性水平,测定精子活动力的变化。结果:MTDR荧光强度值与前向运动速率(progressive motility,PR)不相关(r=0.182,P=0.268)。5 nmol/L和100 nmol/L的RP均可明显降低线粒体活性,50μmol/L HCQ可明显提高线粒体活性(P<0.05),但它们对精子活动力影响都不明显(P>0.05)。结论:线粒体活性对人类精子活力影响不明显。
