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《稀土摻雜納米tiolt2gt的制備及其上轉(zhuǎn)換發(fā)光性質(zhì)研究》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、中文摘要摘要由于納米上轉(zhuǎn)換發(fā)光材料不僅具備了納米材料特殊的物理化學(xué)性質(zhì),而且還具有上轉(zhuǎn)換材料獨(dú)特的發(fā)光性質(zhì),這就使其在許多新的領(lǐng)域有著巨大的潛在的應(yīng)用前景,極具開(kāi)發(fā)和應(yīng)用價(jià)值。因此,對(duì)納米上轉(zhuǎn)換發(fā)光材料的實(shí)驗(yàn)和理論的研究便成為目前高新材料的研究熱點(diǎn)。本論文主要研究了Ti02:yb3+,Er,+和u+摻雜Ti02:Yb“,H03+納米晶的合成以及其上轉(zhuǎn)換發(fā)光性質(zhì),具體如下:1.采用水解一沉淀法制備了納米級(jí)金紅石相Ti02:Yb“,E13+上轉(zhuǎn)換發(fā)光粉。在980nmLD泵浦下,可獲得波長(zhǎng)為526nm、547nm的綠色和659nm的紅色上轉(zhuǎn)換發(fā)光。討論了
2、Er3+摻雜濃度和熱處理溫度對(duì)上轉(zhuǎn)換發(fā)光強(qiáng)度的影響。上轉(zhuǎn)換發(fā)光強(qiáng)度與泵浦功率的關(guān)系表明,綠光和紅光的發(fā)射均為雙光子過(guò)程。隨著泵浦功率的增大,上轉(zhuǎn)換紅光和綠光的強(qiáng)度均逐漸增強(qiáng),但紅光/綠光的相對(duì)強(qiáng)度卻逐漸減弱。此外,對(duì)水熱法、水解一沉淀法、固相法制備的Ti02:礬產(chǎn),E一粉體的物相和上轉(zhuǎn)換發(fā)光性質(zhì)進(jìn)行了比較。2.采用水解一沉淀法合成了納米級(jí)Ij+摻雜Ti02:Yb“,H03+上轉(zhuǎn)換發(fā)光粉,討論了Yb“、H03+離子濃度及熱處理溫度對(duì)發(fā)光的影響。此外,借助XRD、TEM和PL光譜研究了Ij+摻雜對(duì)納米粒子的結(jié)構(gòu)、形貌及上轉(zhuǎn)換發(fā)光性質(zhì)的影響。研究結(jié)果表明
3、:Li+摻雜使納米粒子的顆粒尺寸有所增大,形貌更加完好,且基本為橢球形,并且晶粒的結(jié)晶度亦顯著提高。特別是Ij+摻雜后,樣品的上轉(zhuǎn)換發(fā)光強(qiáng)度大幅度提高,其原因可歸因于Ij+的電荷補(bǔ)償作用及摻雜所引起的體系中氧空位數(shù)目的增加。當(dāng)Ij+摻雜濃度為7.5m01%時(shí),上轉(zhuǎn)換發(fā)光強(qiáng)度達(dá)到最大,此時(shí),綠光發(fā)射強(qiáng)度相對(duì)于不摻u+的樣品提高200倍左右,白天用肉眼可觀察到明亮的綠色上轉(zhuǎn)換發(fā)光.關(guān)鍵詞:納米晶;上轉(zhuǎn)換發(fā)光;Ti02;稀土;U離子英文摘要SynthesisandUpconversionLuminescencePropertiesofrare-earth
4、dopedTi02NanocrystalAbstractNano-sizedupconversionluminescencematerialhasenormouspotentialapplicationinmanynewareas,largevaluesofexplorationandapplicationnotonlybecauseithasuniquephysicalandchemicalpropertiesthataredifferentfromthoseofbulkmaterialsuniqueluminescencepropertieso
5、fupconversion.Therefore,theresearchofexperimentandtheoryofnano—sizedupconversionluminescencematerialshasbecomeoneofthehotspotsintheresearchfieldsofadvancedmaterialsnowadays.ThispapermainlyresearchedonthesynthesisandluminescencepropertyofTi02:Yb“,Er3+andLi+dopedTi02:yb3+,H03+na
6、no-crystal.Themaincontentsareasfollowing:1.Ti02:坩+.E—nano-sizedup—conversionphosphorswerepreparedbyhydrolysis-precipitationmethod.Thegreen(526nm,547um)andred(659nm)emissionhavebeenobservedundertheexcitationof980nmLD.TheinfluencesofEr3+concentrationandheat-treattemperatureonupc
7、onvemionluminescencearediscussed.Theupconversionluminescenceintensitiesdependenceonpumppowerconfirmedthatbothgreenandredemissionaretwo-photonabsorptionprocesses.Theredandgreenemissiongraduallyincreasewiththeincreaseofpumppower.However,relativeintensityratioofredemissionandgree
8、nemissiongraduallydecreaseswiththeincreaseofpumppower.2.TheLi