發(fā)布時(shí)間：2018-04-13 11:37

  本文選題：上轉(zhuǎn)換發(fā)光 + 納米粒子�。� 參考：《暨南大學(xué)》2010年碩士論文

【摘要】： 稀土熒光及上轉(zhuǎn)換納米發(fā)光材料在熒光體、顯示顯像、固態(tài)光源、X射線增光屏、激光和光纖放大以及生物熒光探針等領(lǐng)域具有廣泛的應(yīng)用。稀土發(fā)光具有吸收能力強(qiáng),轉(zhuǎn)換效率高,可發(fā)射從紫外線到紅外光的光譜等優(yōu)點(diǎn)。而上轉(zhuǎn)換發(fā)光是稀土發(fā)光的一種獨(dú)特形式,稀土上轉(zhuǎn)換納米發(fā)光材料在紅外光激發(fā)下,可產(chǎn)生可見發(fā)射,且發(fā)射譜線窄(壽命長(zhǎng)),發(fā)光穩(wěn)定(不易受環(huán)境影響)和熒光背景低。近年來,人們對(duì)熒光標(biāo)記材料產(chǎn)生了濃厚的興趣,特別是隨著納米技術(shù)的發(fā)展,能夠進(jìn)行生物標(biāo)記的無機(jī)納米晶體成為人們研究的熱點(diǎn),但是由于生物發(fā)光背景同樣會(huì)產(chǎn)生熒光從而對(duì)熒光檢測(cè)形成干擾,于是不會(huì)產(chǎn)生背景干擾的稀土上轉(zhuǎn)換納米發(fā)光標(biāo)記物引起了人們的注意。目前世界上上轉(zhuǎn)換納米熒光材料正處在發(fā)展階段,材料的選擇和合成有待于深入細(xì)致的研究。本文對(duì)上轉(zhuǎn)換發(fā)光納米晶的合成和發(fā)光做了系統(tǒng)的討論。 本論文綜述了稀土發(fā)光納米材料的研究現(xiàn)狀；簡(jiǎn)要介紹了稀土離子上轉(zhuǎn)換發(fā)光機(jī)制及稀土納米上轉(zhuǎn)換發(fā)光材料的制備方法；分析上轉(zhuǎn)換發(fā)光材料在研究中存在的問題以及提高上轉(zhuǎn)換發(fā)光效率的幾種途徑。 本文研究采用了有機(jī)醇為溶劑的溶劑熱法200℃下制備氧化銦錫(ITO)納米粉體,考察了溶劑類型、反應(yīng)溫度、反應(yīng)時(shí)間、共沉淀pH值、反應(yīng)釜填充量等對(duì)ITO粉體組成、晶型、粒度及性能的影響。 研究發(fā)現(xiàn)以乙二醇為溶劑,在低至190℃下反應(yīng)1h可以得到灰藍(lán)色納米ITO粉末。由SEM、TEM圖可以看出,該粉末為立方晶體或者類球型的納米顆粒,粉末的粒徑均小于100 nm,隨著溶劑熱反應(yīng)溫度的提高,ITO粉體的結(jié)晶性越來越好,加入PEG 4000分散劑后,結(jié)晶性和分散性大為提高。 在此基礎(chǔ)上,首次利用低溫溶劑熱法制備了In2O3:Er3+, Yb3+和In2O3:Ho3+, Yb3+兩種上轉(zhuǎn)換納米熒光粉。由發(fā)光光譜圖表明：Er3+/Ho3+,Yb3+雙摻雜對(duì)In2O3晶體結(jié)構(gòu)未產(chǎn)生明顯的影響,而且所得的粉體顆粒分布均勻,粒徑��；兩個(gè)體系在稀土離子摻雜濃度不斷增大時(shí),上轉(zhuǎn)換熒光強(qiáng)度都是先是增強(qiáng)后減弱甚至發(fā)生熒光猝滅；而且發(fā)光過程都為雙光子過程。In2O3:Er3+, Yb3+和In2O3:Ho3+,Yb3+兩種上轉(zhuǎn)換納米熒光粉的成功制備,為把氧化銦納米材料組裝成發(fā)光薄膜、生物傳感器及用于生物免疫的納米探針等提供重要的應(yīng)用前提。
[Abstract]:Rare earth fluorescence and up-conversion nano-luminescent materials have been widely used in the fields of fluorescence, display imaging, solid-state light source X-ray screen, laser and optical fiber amplification and biological fluorescence probe.Rare earth luminescence has the advantages of strong absorption, high conversion efficiency and emission from ultraviolet to infrared light.Upconversion luminescence is a unique form of rare earth luminescence. Under the excitation of infrared light, rare earth up-conversion nano-luminescent materials can produce visible emission, with narrow emission lines (long lifetime, stable luminescence (not easily affected by environment) and low fluorescence background).In recent years, people have a strong interest in fluorescent labeling materials, especially with the development of nanotechnology, inorganic nanocrystals that can be biomarked have become the focus of research.However, because bioluminescent background also produces fluorescence and interferes with fluorescence detection, rare earth up-conversion nano-luminescent labels that do not produce background interference have attracted people's attention.At present, the up-conversion nanoscale fluorescent materials are being developed in the world, and the selection and synthesis of the materials need to be studied deeply and meticulously.The synthesis and luminescence of up-conversion luminescent nanocrystals are systematically discussed in this paper.In this paper, the research status of rare earth luminescent nanomaterials is reviewed, and the upconversion luminescence mechanism of rare earth ions and the preparation methods of rare earth nanocrystalline up-conversion luminescent materials are briefly introduced.The problems existing in the study of up-conversion luminescent materials and several ways to improve the efficiency of up-conversion luminescence are analyzed.In this paper, indium tin oxide (ITO) nano-powders were prepared by solvothermal method using organic alcohol as solvent at 200 鈩，

本文編號(hào)：1744320