With high nutrition and health value,blueberry receives much concern in recent years. Blueberry experts in the world are cultivating new blueberry varieties. They have come up with constructive theoretical support and...With high nutrition and health value,blueberry receives much concern in recent years. Blueberry experts in the world are cultivating new blueberry varieties. They have come up with constructive theoretical support and planting technology researches and are constantly devoted to expanding blueberry planting latitudes. This paper elaborated researches of blueberry at home and abroad,current development situation of blueberry in China and Guangdong Province,analyzed strengths of planting blueberry in Guangdong. Besides,it came up with recommendations for development of blueberry industry. Finally,it discussed development prospects of blueberry planting in Guangdong.展开更多
Besides gas sensitivity,NASICON (Na super ion conductor) material has luminescence characterization.In this paper,the photoluminescence properties of NASICON and doped-NASICON material are investigated.The NASICON mat...Besides gas sensitivity,NASICON (Na super ion conductor) material has luminescence characterization.In this paper,the photoluminescence properties of NASICON and doped-NASICON material are investigated.The NASICON material was synthesized by conventional sol-gel process,and doped with Er_2O_3,Tm_2O_3,Dy_2O_3,CsCl by 1%,3%,5% (mass ratio),respectively.The ultraviolet light (325 nm,He-Cd laser) excited luminescent emissions of the resulted powders are recorded vs.wavelength in the 330 nm to 650 nm range.The main peak of the pure NASICON is found at the wavelength of 474 nm (blue light),the transition energy is 2.616 eV.The luminescent intensity is weakened obviously after doping with Er_2O_3 and Tm_2O_3,but is increased after doping with Dy_2O_3 and 3% CsCl.展开更多
LiErF4 was commonly used as a dipolar-coupled antiferromagnet,and was rarely considered as a luminescent material.Herein,we achieved the strong red upconversion emission of LiErF4 simply by an inert shell coating,i.e....LiErF4 was commonly used as a dipolar-coupled antiferromagnet,and was rarely considered as a luminescent material.Herein,we achieved the strong red upconversion emission of LiErF4 simply by an inert shell coating,i.e.,LiErF4@LiYF4.Owing to the unique and intrinsic ladder-like energy levels of Er3+ions,this LiErF4 core–shell nanostructures present red emission(~650 nm)under multi-band excitation in the near-infrared(NIR)region(~808,~980,and^1,530 nm).A brighter and monochromic red emission can be further obtained via doping 0.5%Tm3+into the LiErF4 core,i.e.,LiErF4:0.5%Tm3+@LiYF4.The enriched Er3+ions and strong monochromic red emission natures make LiErF4:0.5%Tm3+@LiYF4 nanocrystals very sensitive for trace water probing in organic solvents with detection limit of 30 ppm in acetonitrile,50 ppm in dimethyl sulfoxide(DMSO),and 58 ppm in N,N-dimethylformamide(DMF)under excitation of 808 nm.Due to their superior chemical and physical stability,these nanoprobes exhibit excellent antijamming ability and recyclability,offering them suitable for real-time and long-term water monitoring.展开更多
基金Supported by National Science and Technology Project of the Ministry of Science and Technology in the Twelfth Five-Year Plan Period(2012BAD22B0504)Special Project on the Integration of Industry,Education and Research of Guangdong Province(2013B090200065)Science and Technology Planning Project of Guangdong Province(2012B050500009)
文摘With high nutrition and health value,blueberry receives much concern in recent years. Blueberry experts in the world are cultivating new blueberry varieties. They have come up with constructive theoretical support and planting technology researches and are constantly devoted to expanding blueberry planting latitudes. This paper elaborated researches of blueberry at home and abroad,current development situation of blueberry in China and Guangdong Province,analyzed strengths of planting blueberry in Guangdong. Besides,it came up with recommendations for development of blueberry industry. Finally,it discussed development prospects of blueberry planting in Guangdong.
文摘Besides gas sensitivity,NASICON (Na super ion conductor) material has luminescence characterization.In this paper,the photoluminescence properties of NASICON and doped-NASICON material are investigated.The NASICON material was synthesized by conventional sol-gel process,and doped with Er_2O_3,Tm_2O_3,Dy_2O_3,CsCl by 1%,3%,5% (mass ratio),respectively.The ultraviolet light (325 nm,He-Cd laser) excited luminescent emissions of the resulted powders are recorded vs.wavelength in the 330 nm to 650 nm range.The main peak of the pure NASICON is found at the wavelength of 474 nm (blue light),the transition energy is 2.616 eV.The luminescent intensity is weakened obviously after doping with Er_2O_3 and Tm_2O_3,but is increased after doping with Dy_2O_3 and 3% CsCl.
基金the Science and Technology Development Program of Jilin Province(No.20170520162]H)the National Key Research and Development Program of China(No.016YFC0207300)+3 种基金the National Natural Science Foundation of China(Nos.61875191,11874354,61722305,and 61833006)the Program for Jilin University Science and Technology Innovative Research Team(No.JLUSTIRT 2017TD-07)Jilin Development and Reform Commission(No.2018C052-10)the Open Project of State Key Laboratory of Supramolecular Structure and Materials(No.sklssm202023).
文摘LiErF4 was commonly used as a dipolar-coupled antiferromagnet,and was rarely considered as a luminescent material.Herein,we achieved the strong red upconversion emission of LiErF4 simply by an inert shell coating,i.e.,LiErF4@LiYF4.Owing to the unique and intrinsic ladder-like energy levels of Er3+ions,this LiErF4 core–shell nanostructures present red emission(~650 nm)under multi-band excitation in the near-infrared(NIR)region(~808,~980,and^1,530 nm).A brighter and monochromic red emission can be further obtained via doping 0.5%Tm3+into the LiErF4 core,i.e.,LiErF4:0.5%Tm3+@LiYF4.The enriched Er3+ions and strong monochromic red emission natures make LiErF4:0.5%Tm3+@LiYF4 nanocrystals very sensitive for trace water probing in organic solvents with detection limit of 30 ppm in acetonitrile,50 ppm in dimethyl sulfoxide(DMSO),and 58 ppm in N,N-dimethylformamide(DMF)under excitation of 808 nm.Due to their superior chemical and physical stability,these nanoprobes exhibit excellent antijamming ability and recyclability,offering them suitable for real-time and long-term water monitoring.
