Sr4Al14O25:Eu2+,Dy3+的制备与长余辉发光性能研究

采用高温固相反应制备稀土掺杂长余辉发光样品.原料配比按照化学式Sr4Al14O25:Eu20.+01,Dy03.+02准确称取,反应温度从1100℃逐渐升至1400℃,通过X射线衍射(XRD)图谱和扫描电子显微镜(SEM)照片,分析反应温度对产物物相和样品表面微观形貌的影响.在得到Sr4Al14O25:Eu2+,Dy3+单相发光材料基础上,研究了不同Eu2+掺杂浓度对发光体发射光谱的影响.通过对不同结构发光体的余辉衰减特性和热释光谱进行分析,得出不同结构发光体的余辉衰减快慢不同,是由于其基质中存在的陷阱能级深度不同,且陷阱能级越深,余辉时间越长.     

H3BO3对燃烧法制备SrAl2O4：Eu，Dy发光性能的影响

利用燃烧法制备SrAl2O4：Eu,Dy发光材料,研究H38O3助熔剂对材料发光性能的影响。通过对材料的XRD图、激发和发射光谱以及余辉衰减蓝线分析,发现在一定的掺杂浓度范围内,H3BO3的加入能起到稳定纯相,促使Eu^3＋向Eu^2＋转换并稳定Eu^2＋的作用,使材料的发光亮度增强,余辉时间明显延长。     

Study on oxide resistance of long persistentphosphor SrAl_2O_4:Eu, Dy

1IntroductionLong persistent afterglowhas beenfoundin a number of rare earth dopedluminescence materials,suchas CaAl2O4∶Nd3+,Eu2+,Sr4Al14O25∶Eu2+,Dy3+and SrAl2O4∶Eu2+,Dy3+.The persistent afterglowgenerally arises fromemissions onthei mpurity centers.Electrons fromthese centers are excitedtothe con-duction band and can fall into traps belowthe band.These trapped electrons can be thermally activatedback to the conduction band andfall into excited state of the centers.They returntothe g…     

H3BO3对燃烧法制备SrAl2O4: Eu, Dy发光性能的影向

利用燃烧法制备SrAl2O4: Eu, Dy发光材料,研究H3BO3助熔剂对材料发光性能的影响.通过对材料的XRD图、激发和发射光谱以及余辉衰减曲线分析,发现在一定的掺杂浓度范围内,H3BO3的加入能起到稳定纯相,促使Eu3 向Eu2 转换并稳定Eu2 的作用,使材料的发光亮度增强,余辉时间明显延长.     

H3BO3对微波加热法合成Sr2MgSi2O7:Eu2+,Dy3+长余辉发光材料性能的影响

采用微波加热法在碳粉还原的条件下制备出发光亮度高、余辉性能较为优良的Sr2MgSi2O7∶Eu2+,Dy3+长余辉发光材料,并研究了H3BO3添加量对其相组成结构、光谱性能和余辉性能的影响.实验结果表明,添加适量的H3BO3可以改善Sr2MgSi2O7∶Eu2+,Dy3+的发光强度和余辉性质.当添加H3BO3的摩尔分数(相对于基质)为20%时,发光粉体具有最佳的发光亮度和余辉性质.     

M2Al2SiO7∶Eu2+(M=Ca,Sr)荧光粉的合成和发光性质的研究

采用传统的高温固相法合成了一系列M2 Al2SiO7∶Eu2+(M=Ca,Sr)荧光粉,并系统地研究了其结构、漫反射光谱、激发光谱、发射光谱及浓度猝灭和温度猝灭特性.研究结果表明,M2Al2SiO7∶Eu2+(M=Ca,Sr)的激发光谱均在250～300 nm和350～450 nm范围内具有两个宽的吸收带,与近紫外LED芯片发出的紫外光相匹配.Ca2Al2SiO7∶Eu2+和Sr2Al2SiO7∶Eu2+荧光粉的发射峰分别为位于约536 nm黄绿光和487nm处的蓝绿光,它们的发射峰归属于Eu2+的5d-4f跃迁发射.Eu2+在M2Al2SiO7(M=Ca,Sr)中的最佳掺杂浓度均为x=0.005.Ca2Al2SiO7∶Eu2+和Sr2Al2SiO7∶Eu2+荧光粉在375 K时的发光强度分别为室温时的69,和68,.     

红色长余辉发光材料Y_2O_2S∶Eu,Mg,Ti光谱性能的研究

对高温固相法制备的新型长余辉发光材料Y2O2S∶Eu,Mg,Ti,通过分析其激发光谱和发射光谱发现,主要是由Eu,Mg,Ti的掺杂引起激发波峰加强并红移,产生了纯正的红色长余辉.该发光材料适合紫外光和可见光激发,具有广泛的应用前景.     

红色长余辉发光材料Y2O2S：Eu，Mg，Ti光谱性能的研究

对高温固相法制备的新型长余辉发光材料Y2O2S：Eu，Mg，Ti，通过分析其激发光谱和发射光谱发现，主要是由Eu，Mg，Ti的掺杂引起激发波峰加强并红移．产生了纯正的红色长余辉．该发光材料适合紫外光和可见光激发，具有广泛的应用前景．     

稀土蓝绿色长余辉发光粉的研制

对制备长余辉发光粉的主要影响因素进行了研究,在Al2O3与SrCO3的摩尔比为1.75:1,激活剂Eu2+和助熔剂H3BO3的质量分数分别为1%和7%,合成温度1400℃的条件下,研制出发射光谱波长为490nm,余辉亮度高,持续时间达10 h以上的蓝绿色长余辉发光粉.     

Study on oxide resistance of long persistent phosphor SrAl2O4: Eu, Dy

The heat-treated temperature and preservative time influence on oxide resistance of SrAl2O4 :Eu2+ ,Dy3+ in high temperature atmosphere were studied in this paper. The result showed that oxide resistance was improved obviously by phosphor particles coated SiO2. The reason for the coating to craze above 900℃ was also analyzed.     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

2014 second batch of rare earth quota released

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