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ID:37372424
大小:2.34 MB
页数:34页
时间:2019-05-22
《稀土掺杂氟化物纳米材料的合成及其光学性质研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、内蒙古师范大学硕士学位论文稀土掺杂氟化物纳米材料的合成及其光学性质研究姓名:王伟华申请学位级别:硕士专业:无机化学指导教师:吴红英;德格吉呼20100610内苤直垣蒸太堂亟±雯』童逾塞:一ABSTRACTForunique1uminescenceoftherareearthdopedfluoridenanomaterials,thesenanoparticlesmayfindgreatapplicationsinthefieldsof3-Ddisplays,bio—detection,solid—statelasers,anti—counterfeiting,infrareddetec
2、tion,andSOOn。Thefluoridenanomaterialsweresynthesizedbythesovlethermalmethod.Thephase,stuctureandmorphologywereanalysisedbyX—raydiffraction,,scansionelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM):.TheXRDpatternswereindexedt.oapureYF3o/thorhombicphaseandapureLaF3hexagonalphase.TEMandS
3、EMimagesshowedthemorphologyofYF3:Yb3+/Er”,LaF3:Yb3+/Tm3+andYF3-Yb3+/Tm3+,whichwerenanoclusters,nanosheetsnanoparticles,microtubes,microrods.TheabilityofagentCTABcontrollingtheparticlemorphologyandsizewerediscussed.TheupconversionspectrumwasmeasuredbyHitachiF一4600spectrophotometer,under978nmdiode
4、laserexcitation.Strongerblue(4Fs/z一.4115/2and2P3/2_4111/2)andgreen(4S3/2,2Hll,2_4115/2)upconversionemissionsofYb3+/Er3+codopedYF3rod—likenanoclusterswereobserved.Thenanoparticlesandnanosheetspresentstrongultravioletandblueupconversionluminescence.Thereweresixemissionbandsintheupconversionemissio
5、nspectraofYF3:Yb3+厂ro+,whichpeakat291nm,345nm,361nm,450nm,475nmand65lnm。Andtheywerecorrespondedtothe116_3H6,116_’F4,1D2_3I-16ofTin”cations.Therelationshipbetweenupconversionrelativeintensityandpumppowerwasalsostudied.Groundstateabsorption,excitationstateabsorptionandenergytransferwereusedindiscu
6、ssingtheupconversionmechanismofthenanocrystalsandthepertinentupconversionmechanismmodelsofthenanocrystalswereproposed.KEYWORDS:Rareearth,fluorides,nanomaterials,upconversionluminescence,hydrothermalmethod内苤直垣歪友雯亟±茎】堑途塞独创性声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的研究成果,尽我所知,除了文中特别加以标注和致谢的地方外,论文中不包含其他人已经发表
7、或撰写过的研究成果,也不包含本人为获得内蒙古师范大学或其它教育机构的学位或证书而使用过的材料。本人保证所呈交的论文不侵犯国家机密、商业秘密及其他合法权益。与我一同工作的同志对本研究所做的任何贡献均已在论文中作了明确的说明并表示感谢。签名:至鳢:日期:勿汐年多月江日关于论文使用授权的说明本学位论文作者完全了解内蒙古师范大学有关保留、使用学位论文的规定:内蒙古师范大学有权保留并向国家有关部门或机构送交论文的复印件和磁盘,允许论文被查阅和借阅,可以将
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