简介:Organicmultiplequantumwells(OMQWs)consistingofalternatinglayersoforganicmaterialshavebeenfabricatedfromtris(8-hdroxyquinoline)aluminum(Alq)and2-(4-biphenylyl)-5-(4-tertbutylphenyl)-1,3,3-oxadiazole(PBD)byamultisource-typehigh-vacuumorganicmoleculardeposition.Fromthesmall-angleX-raydiffractionpatternsofAlq/PBDOMQWs,aperiodicallylayeredstructureisconfirmedthroughtheentirestack.TheAlqlayerthicknessintheOMQWswasvariedfrom1nmto4nm.Fromtheopticalaborption,photoluminescenceandelectroluminescencemeasurements,itisfoundthattheexcitonenergyshiftstohigherenergywithdecreasingAlqlayerthickness,ThechangesoftheexcitonenergycouldbeinterpretedastheconfinementeffectsofexcitonintheAlqthinlayers.Narrowingoftheemissionspectrumhasalsobeenobservedfortheelectroluminescentdevices(ELDs)withtheOMQWsstructureatroomtemperature.
简介:Lanthanidehasattractedmuchattentioninthefieldofopticalcommunicationsinrecentyears.SomepropertyanalysesonopticalwaveguideofNd-dopedcrystalNdxY1-xAl3(BO3)4andNd:MgO:LiNbO3aremadeinthispaper,followedbyintroductionofthemethodsofexperimentationandtheoreticalcalculationfortheplanaropticalwaveguides.Therefractiveindexprofilesoftheopticalwaveguidesareanalyzed.Theaboveworkoffersusefulinformationforstudyonnewtypematerialsforopticalcommunications.
简介:Dy3+/Eu3+共掺杂的立方格子NaYF4单晶在~Φ×1厘米大小为10厘米高质量的改进布里奇曼法用氟化钾(KF)作为助熔剂生长。射线衍射(X射线衍射),吸收光谱,激发光谱和发射光谱测量的晶体的相位和发光性能的晶体。分析了激发波长和Dy3+和Eu3+离子浓度对发光特性的影响。NaYF4单晶的掺杂摩尔浓度的1.205%和0.366%的Eu3+,Dy3+具有优良的白色发光的色度坐标x=0.321,y=0.332。这表明Dy3+/Eu3+共掺的立方格子NaYF4单晶可以潜在的发光材料的紫外(UV)光激发的白光发光二极管(LED)。
简介:作者勃勃赵赵名人访谈努力促进中国电子封装事业繁荣发展快速反应、真诚务实是华天发展的法宝期(页)五(1)六(1)专家论坛电子封装技术的新进展新型微电子封装技术知识经济下的管理变革与创新NewICPaekage,assemblytechniquebymeansofa“blind”Alignment“fliP一ehiP”methodandassemblingfaeilities张蜀平高尚通文」逸明郑宏宇杨克武钱枫林VladimirV.Novikov一(3)一(10)三(1)四(1)Top企业报道瑞萨;加强中国市场的整体统一管理战略瑞萨的Slp(Solution
简介:Theoperationprincipleofanarrayedwaveguidegrating(AWG)multiplexerisintroducedandthe4×4AWGwithfollowingdesignparametersisdiscussedindetail,suchasthechoiceofwavelength,theneighboringarrayedwaveguidedistanceΔL,thechannelfrequencyintervalΔf,andthefreespectralrange.Thestructureof4×4AWGisdesignedandtheresultofstimulatedtestisalsogiven.Analysisshowsthatthe4×4AWGischaracterizedbyawidedynamicrange,lowcrosstalk,betterspectrumproperties,andacompactstructure.
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)。