Tb3+掺杂钼酸盐玻璃陶瓷的制备及发光性能表征

采用熔融-晶化法制备了Tb3+掺杂的CaMoO4为主晶相的透明钼酸盐玻璃陶瓷。利用DSC、XRD、SEM确定了该体系玻璃样品的最佳热处理制度：715℃保温2.5 h;随着热处理时间的增加,玻璃陶瓷中的晶粒尺寸逐渐变大;利用UV-Vis-NIR得到样品玻璃陶瓷在可见光区的透过率可达80%;并利用荧光光谱讨论了在相同热处理条件下,不同Tb3+掺杂浓度对玻璃陶瓷样品发光性能的影响,研究表明Tb3+掺杂浓度为7.0mol%时样品的荧光强度最大。     

YVO4：Eu^3＋，Bi^3＋荧光粉的制备及荧光性能研究

用溶胶凝胶法在较低温度下制备了YVO4：Eu^3＋,Bi^3＋荧光粉,采用X射线衍射仪（XRD）,扫描电子显微镜（SEM）及荧光分光光度计测试,研究了合成产物的结构、表面形貌,分析了在Eu3’含量一定的情况下掺杂Bi^3＋的浓度的变化对发光性能的影响。结果表明,溶胶凝胶法合成的YVO4：Eu^3＋,Bi^3＋荧光粉为单相结构、粒径在1um左右、无团聚现象;Bi^3＋对Eu^3＋离子有敏化作用,在一定浓度下使荧光粉的发射强度增加。     

白光SrMoO4:Eu3+,K+@g-C3N4荧光粉的合成及其性能研究

为了获得单一基质白光荧光粉,以三聚氰胺为原料,采用热分解法制备g-C₃N₄蓝色荧光粉,采用高温固相法制备了Sr_0.92Mo O₄:0.08Eu³⁺(SMO:E)和Sr_0.82Mo O₄:0.08Eu³⁺,0.10K⁺(SMO:EK)红色荧光粉,通过沉淀吸附反应制备了Sr_0.82Mo O₄:0.08Eu³⁺,0.10K⁺@0.013g-C₃N₄(SMO:EK-CN)复合荧光粉。利用X射线粉末衍射、红外光谱、荧光光谱、热猝灭分析对荧光粉进行表征,分别探讨了Eu³⁺单掺杂和Eu³⁺、K⁺共掺杂以及Eu³⁺、K⁺、g-C₃N₄     

白光LED照明用新型荧光粉的制备和性能研究

首次报道利用高温固相法结合超声波分散技术合成了Sr3-xMgSi2O8：xEu2＋高亮度白色荧光粉,并对其发光性能进行了研究。该荧光粉在近紫外光激发下发出较强的白光,发射光谱由两个主峰组成,分别位于468.4nm和546.0nm处,并具有不同的荧光寿命,归结为处于不同格位上的Eu2＋离子的5d-4f电子的跃迁发射,从而在单一基质中混合得到了白光,这两个发射峰所对应的激发光谱均分布在250nm-450nm的紫外区,该荧光粉可以被具有400nm的近紫外光发射的InGaN管芯产生的紫外辐射有效激发而产生白光,是一种性能良好的很有前途的单一基质白光LED照明用稀土荧光粉。     

SrMoO_4：0.05Eu~（3＋）,0.05Gd~（3＋）的制备及发光性能研究

分别采用化学沉淀法、微波法、水热法制备了SrMoO4：0.05Eu3＋,0.05Gd3＋荧光粉,并通过X-射线粉末衍射（XRD）、荧光光谱和扫描电子显微镜（SEM）对其晶体结构、荧光光谱和形貌进行了表征。结果表明：SrMoO4：0.05Eu3＋,0.05Gd3＋的结构属体心四方晶系;其宽激发带由Eu3＋-O2-、Gd3＋-O2-电荷迁移带和Mo6＋-O2-基质吸收峰组成,荧光发光以在616nm处Eu3＋的5 D0→7 F2跃迁引起的红光发光最强;254nm紫外光激发时,化学沉淀法制备SrMoO4：0.05Eu3＋,0.05Gd3＋的发光峰比SrMoO4：0.05Eu3＋的相应发光峰强度增大,这是由于Gd3＋向Eu3＋的能量传递敏化增强了Eu3＋的发光。     

铝酸锶稀土发光粉的研究

实验用燃烧法成功合成了SrAl2O4：Eu3＋,Dy3＋长余辉发光材料,对影响发光的主要因素进行了正交试验的研究,优化得到了最佳合成条件。     

溶胶凝胶法制备的Y3Al5O12：Tb^3＋,Ce^3＋的光学性能及能量传递研究

用溶胶凝胶法制备了一系列不同掺杂浓度的Y3Al5O12（YAG）：Tb3＋,Ce3＋荧光粉,对其物相、光学性能和能量传递进行了研究。多晶粉末X-射线衍射结果表明,所有样品均为YAG晶相,没有其它杂相。当样品在Tb3＋的特征激发峰273 nm激发时,除了Tb3＋的特征发射外,还观察到位于467 nm的YAG基质的电荷迁移带、位于520 nm的Ce3＋的2D3/2,5/2→2F5/2,7/2跃迁,这说明可能存在Tb3＋到Ce3＋的单向非辐射能量传递。通过监测共掺样品520 nm的发光,得到273 nm的激发峰,使得Tb3＋（5D3）到Ce3＋（2Di,i=5/2,3/2）的单向非辐射能量传递得到验证;并且随着掺杂Tb3＋浓度的增大,273 nm激发峰增强。同时,Ce3＋掺杂YAG：Tb3＋并没有使Tb3＋发光增强,相反YAG：Tb3＋,Ce3＋中Tb3＋发光与YAG：Tb3＋相比有1个数量级的减弱,造成这种情况的可能原因,一是Tb3＋到Ce3＋的单向非辐射能量传递,使得Tb3＋发光减弱;二是Ce3＋掺杂YAG：Tb3＋后基质所多吸收的能量传给了Ce3＋而非Tb3＋。     

Sm3+离子激活的Ba3ZnNb2O9荧光粉的制备及发光性能

利用高温固相法合成了不同Sm³⁺掺杂浓度的Ba₃ZnNb₂O₉荧光粉,并利用X射线粉末衍射(XRD)、漫反射光谱(DRS)、荧光发射光谱及荧光寿命等表征手段对样品的结构与发光性能进行了研究。XRD结果显示纯样Ba₃ZnNb₂O₉与Ba₃ZnNb₂O₉:Sm³⁺荧光粉的衍射图完全吻合,表明Sm³⁺离子的少量引入并未对晶体结构产生影响。漫反射光谱显示样品可以被近紫外光有效激发。发射光谱表明存在基质向Sm³⁺离子的能量传递过程,Sm³⁺离子的最佳掺杂浓度为x=0.1。     

BaWO4:Eu3+/Tb3+荧光粉的制备及其发光性能的研究

采用共沉淀法制备了Eu3+、Tb3+单掺或双掺的BaWO4荧光粉,探究了Eu3+的掺杂浓度、退火温度及Eu3+和Tb3+掺杂摩尔比对荧光粉发光性能的影响.实验结果表明,当反应温度为500℃、退火时间为2h、Eu3+掺杂浓度为5 mol％时,荧光粉发光强度最强.XRD结果表明,样品为立方晶系的BaWO4相.在掺杂Eu3+...     

SrAl2O4:Eu2+发光材料的制备工艺及发光性能的研究

采用固相烧结法，在碳还原条件下合成了SrAl2O4：Eu^2 发光材料。研究了影响其发光性能的制备工艺及各种因素。探讨了SrAl2O4：Eu^2 发光材料的长余辉性能。     

低温燃烧法合成SrZnO2:Sm3+,Li+及其发光性能研究

采用低温燃烧法合成了SrZnO2:Sm3+,Li+红色荧光体,并用X射线衍射谱、扫描电镜图及荧光光谱对样品结构、形貌和发光性能进行了研究。结果表明,Sm3+离子和Li+离子成功地掺入了SrZnO2基质中,所得样品为正交晶系结构的SrZnO2物相;Sm3+离子在SrZnO2基质中主要占据Sr2+离子不对称性格位,发射来源于5G5/2→6H7/2605nm为主的橙红色光;样品呈比较规则的球形颗粒,分散性好,粒径为100～400nm;Li+离子的掺入能显著提高SrZnO2:Sm3+发光强度,当掺杂比n(Sm3+)∶n(Li+)=1∶3时,发光强度增幅最大。     

铝酸锶长余辉材料的制备工艺改进及光谱性质

本文通过调整助熔剂的引入方式,进而改进SrA12O4∶Eu,Dy的合成方法,在硼掺杂浓度达到25％时制备出高度膨松的SrA12O4∶Eu,Dy材料,并有效提高了材料的余辉时间和余辉亮度.     

Toward temperature-dependent Bi3+-related tunable emission in the YVO4:Bi3+ phosphor

Up until now, many previous works have indicated us that the photoluminescence (PL) properties of phosphors sometimes can be changed with the change in the external temperature, resulting in the anomalous PL phenomena and correlated new applications that are difficult to achieve at room temperature. In this work, we report the temperature-dependent Bi³⁺-related PL properties in the YVO₄:Bi³⁺ phosphor. Our findings show that increasing the temperature from 10 to 300 K enables manipulating the energy interaction from groups to Bi³⁺, thereby leading to the temperature-induced color tuning from blue (0.183, 0.212) to yellow (0.418, 0.490). Upon this heating process, we further reveal that the dynamic Bi³⁺ luminescence has experienced a regular transition from double-exponential to single-exponential decay, which results in the decrease in the average Bi³⁺ lifetime from 122.606 to 0.376 μs. Discussions on the PL results imply that the tunable PL observations are due to the interplay of temperature-dependent energy transfer from groups to Bi³⁺ and redistribution of the excited ³P₀ and ³P₁ states of Bi³⁺ upon the thermal stimulation. This work not only presents the temperature-triggered Bi³⁺ tunable properties in the well-studied YVO₄ host lattice but also can provide new insights into revealing Bi³⁺-related PL mechanism in other Bi³⁺-doped photonic materials in the future and, in the meanwhile, gives some directive ideas for us to explore previously unnoticed applications for rare-earth (RE; eg, Eu³⁺, Pr³⁺, Tb³⁺, Eu²⁺, Er³⁺, etc) and other non-RE (eg, Bi³⁺, Mn⁴⁺, Mn²⁺, Cr³⁺, etc) doped phosphors.     

铕、铈、银共掺杂沸石粉体的制备与荧光性能

通过离子交换法结合后续煅烧处理制备了Eu、Ce、Ag离子共掺杂沸石基荧光粉,研究了多离子引入对沸石基荧光粉结构和性能的影响。结果表明:Ag与Eu共掺杂可以提高Eu掺杂沸石粉的红色荧光强度;在长波紫外光激发下,Ce、Eu共掺杂沸石基粉体经800℃煅烧后表现为红光发射,而Ag的引入导致粉体的红光发射强度降低。     

溶剂热法合成片状SrAl2O4:Eu2+,Dy3+长余辉荧光粉的研究

利用溶剂热法制备了由片组装的花状前驱体,1300℃烧结2h后获得了SrAl2O4:Eu2+,Dy3+片状荧光材料.利用XRD和SEM技术表征了在不同比例的乙醇和水的混合溶液中反应制得的荧光材料的物相组成和形貌,用荧光分光光度计测定了荧光材料的发光性质.结果发现,当乙醇和水的比例为3∶1时,所制备的荧光材料具有较高的结晶性,较好的形貌和较强的发光强度.     

高含量杀虫单原粉及色粉的制备

在生产杀虫双水剂基础上,改变工艺条件,得高含量(95%)杀虫单原粉.经染色制作杀虫单色粉.     

Anomalous enhancement of photoluminescence intensity of sintered YAG:Ce particles‐embedded glasses

For high‐power white LED applications, YAG:Ce‐based yellow phosphors were embedded in a low‐T_g Bi₂O₃–B₂O₅–ZnO–Sb₂O₅ glass by sintering route. Effects of sintering temperature (325‐390°C) on the microstructure and photoluminescence properties were investigated. X‐ray diffraction was used to measure the retained fraction of YAG:Ce phase after sintering. Scanning electron microscope and transmission electron microscope, equipped with energy‐dispersive X‐ray spectrometry, were used to examine the microstructure, including the element distribution across the phosphor–glass interface. Photoluminescence properties of the samples before and after sintering were compared. With the increasing sintering temperature, the retained fraction of YAG:Ce decreased from 83.3% to 82%. This effect tends to reduce the luminescence intensity of the samples after sintering. The increasing sintering temperature also enhances the diffusion of cations (esp. Bi) from glass matrix to YAG:Ce. This effect tends to increase the luminescence intensity of the YAG:Ce particles after sintering. When the sintering temperature was lower (325°C), the effect of YAG:Ce loss was dominant, thus the luminescence intensity was reduced after sintering. When the sintering temperature was higher (350‐390°C), the effect of solute dissolution was dominant, resulting in luminescence intensity anomalously higher than that before sintering. Similar result has not been reported in literatures. The maximum luminescence intensity of the sintered samples is 1.57 times as high as that of the samples before sintering.     

颗粒状钼酸镍负极材料的制备及其电化学性能

为了获得高性能锂离子电池负极材料,以NiCl2·6H2O和乙酰丙酮钼为原料,通过溶剂热法和高温热处理成功合成了颗粒状NiMoO4,将其用于锂离子电池负极材料。采用XRD、SEM、TEM、Raman、BET技术对NiMoO4进行了结构和形貌表征。结果表明,在100 mA/g的电流密度下循环250圈后,可逆容量高达829 mA·h/g。同时,颗粒状NiMoO4展现出了优异的倍率性能。当电流密度从100 mA/g增加到5000 mA/g,然后恢复到100 mA/g时,容量还能够维持恢复到原来的水平。另外,颗粒状NiMoO4电极在1000、 2000、5000 mA/g大电流下,其可逆容量还能够分别高达600、529和412 mA·h/g。