Preparation and Characterization of Bi and Eu-codoped Y2O3 Phosphor by Wet Chemical Methods

发光二极管（LED）具有体积小、发热少、耗电低、寿命长、响应速度快、无汞污染、可平面封装等优点。性能优异的荧光粉可有效提高LED的发光效率，铋铕共掺杂氧化钇粉是近几年发展的、有应用潜力的荧光粉。通过分析对比现有的合成方法，发现沉淀法最有可能替代高温固相法制备荧光粉应用于产业化。微波水热法节省能源，可以制备较细粉体。本文首次用微波水热法研究了铋铕共掺杂氧化钇荧光粉的制备和表征，并在此基础上详细研究了沉淀法的制备和表征。本研究用微波水热法和草酸加氨水做沉淀剂制备铋铕共掺杂氧化钇荧光粉，通过DTA/TG/DTG、XRD、激光粒度仪、SEM、TEM&HRTEM、EDS、FTIR和荧光分光光度计...The light-emitting diode has many advantages, such as small size, less heat-releasing, energy saving, long lasting life, fast responding, free from contamination, possibility being flat-packaged. The phosphors with excellent performance could dramatically improve the luminescent efficiency of LED. In recent years, both Bi and Eu-codoped Y2O3 phosphor has been developed with a fantastic prospect ...学位：工学硕士院系专业：材料学院材料科学与工程系_材料物理与化学学号：2072006115207

Initiative Maintain Platform and Key Technic for Metro Train

Based on the maintain actuality of metro train, a kind of initiative maintain platform was introduced. Main function and topology of the system were presented, as well as the key technic including the information pretreatment technic based on optimized mutual data, the tap and connecting technic of information

Bi and Eu-codoped Y_2O_3 Phosphor Prepared by Microwave Hydrothermal Processing and Its Luminescent Properties

[中文文摘]用微波水热法制备化学计量比为(Y0.94-x,Eu0.06,Bix)2O3(x=0,0.01～0.06)的铋铕共掺杂氧化钇磷光粉。用XRD、SEM、EDS、荧光光谱及HRTEM等进行表征。结果表明:该系统由于铋的加入使(211)晶面的生长受到抑制;在激发波长346 nm时,由于铋的掺入使发光增强;随铋掺杂量的增加,其发光先增强后减弱,并在x=0.03时有最大值;因此该系统可作为320～375 nm的近紫外(如白光LED及高压汞灯)激发用磷光粉。该系统在激发波长为254 nm时,铋的加入使发光强度减弱;因此该系统不适合用于低压汞灯。[英文文摘](Y0.94-x,Eu0.06,Bix)2O3(x = 0,0.01~0.06) phosphor powders were prepared by microwave hydrothermal processing.The powders were characterized by XRD,SEM,EDS,photoluminescence and HRTEM.The growth of the crystal face(211) was restrained,resulting from Bi doping probably.The intensity of the emission spectra was generally enhanced when excited with 346 nm owing to Bi doping.It was raised first and then declined later on,and achieved a maximum when x=0.03,indicating that the phosphor powders can serve in near-UV band of 320~375 nm excitation,for example,forwhite LED and high pressure mercury discharge lamps.The intensity of the emission spectra was generally weakened when excited with 254nm due to Bi doping,suggesting that the phosphor powders as mentioned are not suitable for the low-pressure mercury discharge lamps.福建省重大专项基金(2005HZ02-2)资助项

硅石焙烧-酸浸提纯及杂质相结构的演变

在硅石提纯过程中,采用XRD和EDS分析硅石中杂质元素赋存特征,采用高温焙烧活化与酸浸复合提纯方法研究了酸浸过程杂质相结构演变及提纯效果.结果表明,硅石中不同类型铝硅酸盐的K,Na,Ca,Al,Si含量不同,主要分为长石类、伊利石和高岭石;酸浸提纯过程中硅石的杂质相不仅会溶解在酸中,且长石类杂质相会演变成伊利石和高岭石.与未预酸浸的硅石提纯相比,预酸浸的硅石经高温焙烧活化提纯后纯度达99.995%,达到高纯石英砂的纯度,杂质Al和K含量分别降低了76.6%和66.5%;在700℃下焙烧,预酸浸硅石的Al和K去除效果最好,去除率分别为85%和41%

硅石焙烧-酸浸提纯及杂质相结构的演变

在硅石提纯过程中,采用XRD和EDS分析硅石中杂质元素赋存特征,采用高温焙烧活化与酸浸复合提纯方法研究了酸浸过程杂质相结构演变及提纯效果.结果表明,硅石中不同类型铝硅酸盐的K,Na,Ca,Al,Si含量不同,主要分为长石类、伊利石和高岭石;酸浸提纯过程中硅石的杂质相不仅会溶解在酸中,且长石类杂质相会演变成伊利石和高岭石.与未预酸浸的硅石提纯相比,预酸浸的硅石经高温焙烧活化提纯后纯度达99.995%,达到高纯石英砂的纯度,杂质Al和K含量分别降低了76.6%和66.5%;在700℃下焙烧,预酸浸硅石的Al和K去除效果最好,去除率分别为85%和41%

填充毛细管液相色谱-毛细管气相色谱在线联用分析八角茴香挥发油

首次将填充毛细管高效液相色谱-毛细管气相色谱在线联用技术(μ-HPLC-CGC)用于分离分析八角茴香果实的挥发油成分。液相色谱选用氰基分析柱(250mm×0．32mm i．d．)，正己烷-乙腈-二氯甲烷(体积比为80：8：12)为流动相，对挥发油样品做族组分分离，得到的5个族组分被依次存放在多位储存接口内，然后不分流分别转入毛细管气相色谱仪做详细分析。气相色谱柱由10m×0．53mm i．d．保留间隔柱和30m×0．53mm i．d．×1．0 μmSE-54分析柱组成。采用了不分流柱内进样模式以利于定量及谱图的叠加和比较。将族组成分析得到的5个气相色谱图与单独用毛细管气相色谱分析的谱图对比，发现至少分离出3种新的化学成分

填充毛细管液相色谱-毛细管气相色谱在线联用分析八角茴香挥发油

首次将填充毛细管高效液相色谱-毛细管气相色谱在线联用技术(μ-HPLC-CGC)用于分离分析八角茴香果实的挥发油成分。液相色谱选用氰基分析柱(250mm×0．32mm i．d．)，正己烷-乙腈-二氯甲烷(体积比为80：8：12)为流动相，对挥发油样品做族组分分离，得到的5个族组分被依次存放在多位储存接口内，然后不分流分别转入毛细管气相色谱仪做详细分析。气相色谱柱由10m×0．53mm i．d．保留间隔柱和30m×0．53mm i．d．×1．0 μmSE-54分析柱组成。采用了不分流柱内进样模式以利于定量及谱图的叠加和比较。将族组成分析得到的5个气相色谱图与单独用毛细管气相色谱分析的谱图对比，发现至少分离出3种新的化学成分