简介:srzn2(PO4)2:在大气中的高温固相反应合成Sm3+荧光粉。srzn2(PO4)2:Sm3+荧光粉是通过紫外光有效激发(UV)和蓝色光,和发射峰被分配到2-6h54G5//2过渡(563nm),2-6h74G5//2(597nm和605nm)和2-6h94G5//2(644nm和653nm)。对srzn2发射强度(PO4)2:Sm3+的Sm3+浓度的影响,其浓度猝灭效应srzn2(PO4)2:钐也观察到。当掺杂离子(=Li,Na和K)离子的发光强度,srzn2(PO4)2:Sm3+可以明显增强。在国际照明委员会(CIE)的srzn2色坐标(PO4)2:Sm3+定位在橙红色的区域。结果表明,该荧光粉具有潜在的应用在白光发光二极管(LED)。
简介:Inthispaper,quartzcrystalmicrobalance(QCM)gassensorscoatedwithpolyehtyleneimine(PEI)wasutilizedforcarbondioxide(CO2)detection.Thesensingmechanismisbasedontheavailabilityofreversibleacid-basereactionsbetweenCO2moleculesandPEIatroomtemperature.TheexperimentalresultsrevealedthatthePEI/starchsensorexhibitedmuchhighersensitivitythanthatofpurePEI,andshowedapproximatelinearityoveraconcentrationregionrangingfrom500ppmto8000ppm.Theinfluenceofhumidityhadalsobeeninvestigated.Furthermore,theresponseandrecoverytimedeceasedastheoperationtemperaturesincreased.Finally,sensitivitylossafterconservationforseveraldaysandreversibilityofthesensorshadbeendiscussed.
简介:Areviewontheprogressofpowerful2μmsilicafibersourcesinpastdecadesispresented.Wereviewthestate-of-the-artrecordsandrepresentativeachievementsof2μmhigh-average-powercontinuouswave,pulsedfiberlasersandamplifiers,andpowerfulsuperfluorescentsources.Challengeswhichlimitthefurtherpowerscalingof2μmsilicafibersourcesarediscussed,includingpumpingbrightnesslimitation,thermalproblem,andnonlineareffects.Potentialandpromisingroadmapstogobeyondtheselimitations,liketandempumpingandbeamcombining,arediscussed.Prospectsofpowerful2μmsilicafibersourcesarealsopresentedintheendofpaper.
简介:本文就运用于某型号雷达中,微波多层印制电路板制造用原材料的泰康利公司高频介质材料TSM—DS3,进行了性能及特点介绍。在此基础上,对选用此类高频介质基板材料及半固化片FastRise-28,制造一种微波电路板的先进工艺技术、以及质量管控技术,进行了较为详细的介绍。最后,还针对此次高频多层印制板制造过程中的关键工艺技术进行了较为详细的阐述,其中包括有TSM—DS3高频材料的多层化实现技术、TSM—DS3—500HM高频电阻材料的平面电阻阻值控制技术、TSM—DS3高频材料的变形控制技术、TSM—DS3高频材料多层板孔金属化互连实现的背钻深度控制技术,以及TSM—DS3高频材料多层印制板局部外形侧壁金属化技术等。