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1、論文題目:學(xué)科專業(yè):學(xué)位申請(qǐng)人:指導(dǎo)老師:近紅外上下轉(zhuǎn)換發(fā)光材料的制備與發(fā)光性質(zhì)研究應(yīng)用化學(xué)劉翊余錫賓摘要本文通過溶劑熱法,在較為溫和的制備條件下(200~250℃),無需使用任何保護(hù)氣氛,制備了具有較高結(jié)晶性的硫氧化釔微納米材料。通過調(diào)控反應(yīng)體系中S2’離子的濃度可調(diào)控產(chǎn)物的微觀形貌,依次可得到粒徑為20nm的納米片,粒徑都為21am的由納米片組裝的盤狀結(jié)構(gòu)和花狀結(jié)構(gòu),以及粒徑為1.51xm的納米粒子堆積的球狀結(jié)構(gòu)。通過摻雜Yb3+,Er3+等稀土離子,研究了不同形貌Y202S微納米材料在980nm激光激發(fā)下的上轉(zhuǎn)換發(fā)光性質(zhì),結(jié)果發(fā)現(xiàn)以球
2、狀結(jié)構(gòu)的Y202S作為熒光基質(zhì)其上轉(zhuǎn)換發(fā)光效果最佳,發(fā)出明亮的綠光,其發(fā)光強(qiáng)度與高溫固相法制得的yb3+,Er3+摻雜的NaYF4相當(dāng),可用于制備上轉(zhuǎn)換太陽(yáng)能電池增效光學(xué)薄膜,生物熒光檢測(cè),近紅外光轉(zhuǎn)換和檢測(cè)等領(lǐng)域。另外,本文也用高溫固相法制備了一種新的Bi3+,Yb3+共摻雜GdV04量子裁剪近紅外發(fā)光材料,該材料在波長(zhǎng)為250~400nm的紫外光激發(fā)下發(fā)射出很強(qiáng)的近紅外光(900~1100nm)。由于體系中Bi3+離子的引入,相對(duì)于Gdo.9Ybo.1V04,Gdo.87Ybo.1Bio.03V04在989nm處的近紅外發(fā)光強(qiáng)度提高近1
3、20%,且其激發(fā)峰也從323nm紅移至341nm,整個(gè)激發(fā)譜帶更寬,更有利于實(shí)際應(yīng)用。由于Yb3+離子既可以利用基質(zhì)中的V043。電荷遷移態(tài)躍遷的能量,也可以同時(shí)利用Bi3+的1So-3pl能級(jí)躍遷傳遞能量,相對(duì)于目前報(bào)道的理論量子裁剪效率最高的YV04:Bi3十,Yb3+,GdV04:Bi3+,yb3+無論其近紅外發(fā)光強(qiáng)度還是可見光發(fā)光強(qiáng)度強(qiáng)度皆有提升,是一種很有希望的紫外激發(fā)量子裁剪材料。關(guān)鍵詞近紅外光;硫氧化釔;上轉(zhuǎn)換;釩酸釓;量子裁剪論文類型:應(yīng)用基礎(chǔ)ThesisTitle:SynthesisandLuminescenceResea
4、rchofRareEaChDopedNIRupconversionanddownconversionmaterialsDisciplines:AppliedChemistryApplicant:HongLiuTutor:XibinYuAbstractThepreparation,characterizationandluminescenceresearchoftwokindsofNIRconversionmaterialswerediscussedinthiswork.Themorphologycontrolledsynthesisofyb
5、3+/Er3+dopedY202Swasdiscussedinchapter2andtheBi3+/Yb3+dopedGdV04quantum--cuttingmaterialwasdicussedinchapter3.Inchapter1,weintroducedthebackgroundknowledgeofNIRconversionmaterialsandapplicationinpractice.Inchapter2,highlycrystallinemicro/nanosizedY202Swerepreparedthroughao
6、ne。potmild(200~250℃)solvothermalsynthesis.BysimplyadjustingtheconcentrationofS2。,themorphologyandsizeofthetargetproductwere20nmnanosheet,2p.msheet-assembleddisk/flowerand1.51amnano.a(chǎn)ssembledsphere.Westudiedtheupconversionluminescenceofyb3+/Er3+dopedY202Swithdifferentmorpho
7、logy.Theresultshowedthatnano。assembledspherepresentthestrongestgreenemissionwhichshouldturntolesssurfacedefect·Forcomparation,NaYF4:Yb3+/Er3+waspreparedbysolidstatemethod,andourY2029:Yb3+/Er3+showedthecomparativeemissionintensityInchapter3.Bi3+/Yb3+dopedGdV04quantum—cuttin
8、gmaterialwaspreparedbysolidstatemethod.Theexcitationspectrarangedfrom250nmto400nmandemitt