Eu3+掺杂钛酸盐红色LED材料 材料学专业VIP免费

Eu3+掺杂钛酸盐红色LED材料【摘要】：白色发光二极管被誉为第四代照明光源，由于它具有使用寿命长、节能环保、显色效果好以及污染较小的特点，是一种新型的固态照明光源，近年来备受科研人员的广泛关注。现阶段较为普遍制作白光LED的方法是蓝色LED芯片激发黄色荧光粉，但是这种方法缺少了一定的红色成分，使得其显色指数和色温等光学性能参数不太理想。因此，寻找能够与白光LED相匹配的红色荧光粉显得尤为重要。本次毕业设计通过高温固相法合成制作得到NaY1-xTiO4：xEu3+荧光粉，同时本论文也详细探究了样品的发光性能。在615nm发射波长监控下，该发光材料的激发峰位置处于362nm、383nm、396nm、409nm以及465nm处，其分别对应7F0→5D4、7F0→5G2、7F0→5L6、7F0→5D3和7F0→5D2跃迁。该发光材料在受到396nm波长辐照时，掺杂不同浓度Eu3+样品都有3个明显发射峰，其位置位于590nm、615nm和702nm处。通过XRD衍射仪测试掺杂入各种Eu3+浓度的发光材料的物相结构，发现掺入不同Eu3+浓度后没有改变基质的晶体结构。通过测量Eu3+浓度与发光强度的关系，可知，当Eu3+掺杂的量增加时，荧光材料的发光强度是先变强后变弱，掺入浓度为10％时样品的发光强度最大。经研究表明NaYTiO4：Eu3+系列发光材料与LED芯片匹配，其在白光LED中的应用很有研究价值。【关键词】：铕离子，钛酸盐，高温固相法，发光材料Eu3+-dopedredtitanatematerialsforLEDAbstract：Whitelight-emittingdiodeisknownasthefourth-generationlightingsource.Becauseofitslongservicelife,energysavingandenvironmentalprotection,goodcolorrenderingeffectandlowpollution,itisanewtypeofsolid-statelightingsource,whichhasbeenwidelyusedbyresearchersinrecentyears.Atpresent,themethodformakingwhiteLEDsismorecommon.TheblueLEDchipexcitestheyellowphosphor,butthismethodlacksacertainredcomponent,whichmakestheopticalperformanceparameterssuchascolorrenderingindexandcolortemperaturelessthanideal.Therefore,itisparticularlyimportanttofindredphosphorsthatmatchthewhiteLEDs.ThegraduationdesignwassynthesizedbyhightemperaturesolidphasemethodtoobtainNaY1-xTiO4:xEu3+phosphor.Atthesametime,theluminescencepropertiesofthesamplewerealsostudiedindetail.Underthemonitoringoftheemissionwavelengthof615nm,theexcitationpeakpositionsoftheluminescentmaterialsareat362nm,383nm,396nm,409nmand465nm,whichcorrespondto7F0→5D4,7F0→5G2,7F0→5L6,7F0→5D3and7F0→5D2transition.Whenirradiatedby396nmwavelength,theluminescentmaterialhasthreedistinctemissionpeakswithdifferentconcentrationsofEu3+,anditspositionsarelocatedat590nm,615nmand702nm.ThephasestructureoftheluminescentmaterialsdopedwithvariousEu3+concentrationswastestedbyXRDdiffractometry,anditwasfoundthatthecrystalstructureofthematrixwasnotchangedaftertheconcentrationofdifferentEu3+wasincorporated.BymeasuringtherelationshipbetweenEu3+concentrationandluminescenceintensity,itcanbeseenthatwhentheamountofEu3+dopingincreases,theluminescenceintensityofthefluorescentmaterialbecomesstrongerfirstandthenbecomesweaker,andtheluminescenceintensityofthesampleisthelargestwhentheconcentrationis10%.TheresearchshowsthattheNaYTiO4:Eu3+seriesofluminescentmaterialsarematchedwithLEDchips,anditsapplicationinwhiteLEDsisofgreatresearchvalue.Keywords：Eu3+，titanate，hightemperaturesolidphasemethod，luminescentmaterials目录1.绪论...........................................................................................................11.1课题背景..............................................................................................11.2白色发光二极管(WLED)概述...................................................................11.2.1白光LED实现方式.....