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1、中文摘要上轉(zhuǎn)換發(fā)光現(xiàn)象在許多新的領(lǐng)域有著巨大的潛在的應(yīng)用前景,極具丌發(fā)和應(yīng)用價值。因此,對上轉(zhuǎn)換發(fā)光材料的實驗和理論研究便成為目前高新材料的研究熱點。本文以尋找高效的氧化物上轉(zhuǎn)換基質(zhì)材料為目標,探討了在納米二氧化鈦基質(zhì)中稀土離子在980nm激光器激發(fā)下的上轉(zhuǎn)換發(fā)光特性,主要考察了納米二氧化鈦基質(zhì)中Er3+單摻、Er3+/Yb3+和Tm3+/Yb3+雙摻三種體系中,熱處理溫度、稀土摻雜濃度等因素對其上轉(zhuǎn)換發(fā)光的影響,對上轉(zhuǎn)換發(fā)光機制做了進一步探討,并研究了“+摻雜對Ti02:Tm3h礓3+發(fā)光的增強作用,得到以下結(jié)論:1.在納米Ti02基質(zhì)中摻入稀土Er3+和Er3+/
2、Yb3+,以980nm激光為泵浦光源,分別獲得位于525m,548nm和660nm綠、紅光上轉(zhuǎn)換發(fā)光。在Ti02納米晶體中共摻入稀土Tm3+和Yb3+,獲得了476nm較強的藍色和651nm的紅色,及694nm微弱的紅色上轉(zhuǎn)換發(fā)光。稀土離子摻入到納米Ti02晶格中,對二氧化鈦的晶型和晶粒大小都有影響。2.由于Yb3+離子特殊的能級結(jié)構(gòu),它對Er3+離子和Tm”離子的上轉(zhuǎn)換發(fā)光有敏化作用,雙摻的上轉(zhuǎn)換發(fā)光強度比單摻Er3十和Tm3+時明顯增強。3.在Er3+:Ti02體系中,隨著熱處理溫度的升高,上轉(zhuǎn)換發(fā)光強度先增加后急劇下降;在Yb3+/Tm”:Ti02體系中,隨著熱
3、處理溫度的升高,上轉(zhuǎn)換發(fā)光強度逐漸增強。4.在“+/Yb3+/Tm3+:Ti02體系中,發(fā)現(xiàn)Li+摻入后,Yb3+/Tm3+:Ti02上轉(zhuǎn)換發(fā)光強度大幅度提高。當(dāng)Li+摻雜濃度為3.0m01%時,上轉(zhuǎn)換發(fā)光強度達到最大。5.通過分析上轉(zhuǎn)換發(fā)光的強度與泵浦功率的關(guān)系,作者發(fā)現(xiàn)Er3+單摻、Er3+/Yb3+共摻Ti02納米晶體上轉(zhuǎn)換綠光和紅光發(fā)射,Tm3+/Yb3+共摻Ti02納米晶體上轉(zhuǎn)換藍光和紅光發(fā)射均為雙光子吸收過程。關(guān)鍵詞:納米Ti02,Er3+/yb3+摻雜,Li+/Tm3+m3+摻雜,上轉(zhuǎn)換發(fā)光AbstractTheup.conversionluminesc
4、encephenomenonhasenormouspotentialapplicationsinmanynewareas.Therefore,theresearchofexperimentandtheoryofnano—sizedupconversionluminescencematerialshasbecomeoneofthehotspotsintheresearchfieldsofadvancedmaterialsnowadays.Itistheaimtofindasuitableoxideasadopedmatrixforrare—earthionstogeth
5、ighup·-conversionefficiency.Theup·-conversionluminescencepropertiesofrare·-earthionswerediscussedundera980nmLDexcitationunderdifferentannealedtemperature,concentrationandSOoninTiO,nanocrystalsmatt6x.Theup.conversionmechanismsoftheTi02:Er3+,Ti02:Er3+/Yb3+andTi02:Tm3+/Yb3+wereinvestigated
6、.Theresultsasbellow:1.Greenandredemissionsat525nm,548nmand660nmwereobtainedinTi02:Er3+andTi02:Er3+/Yb3+nano.crystallite.Blueandredemissionsat476nmand65lnm,694nmwereobtainedinTm3+A飛”CO—dopedTi02nano—crystallite.ThestructureandsizeofTi02nanocrystalswerechangedafterdopingrare-earth.2.Becau
7、seofthespecialenergylevelofYb3+.itcansensitizeEr3+andTm3+.TheluminescenceintensityinEr3+/Yb3+andTm3+/Yb3+co.dopedTi02samplesaremuchstrongerthanthosewithoutYb3+ions.3.InEr3+-dopedTi02nanocrystal,theluminescenceintensityincreasesandthenobviouslydecreaseswithincreasingheat—treatme