本文選題：離子液體 + 水熱法�。� 參考：《浙江師范大學》2010年碩士論文

【摘要】： 上轉(zhuǎn)換發(fā)光在全固態(tài)緊湊型激光器件(紫、藍、綠區(qū)域)、上轉(zhuǎn)換熒光粉、紅外量子計數(shù)器、三維立體顯示、溫度探測器和生物分子的熒光探針等領(lǐng)域有較好的應用前景,一直是發(fā)光材料的一個研究熱點。氟化物材料是一類重要的上轉(zhuǎn)換發(fā)光基質(zhì)材料,具有較低的聲子能量、較高的發(fā)光效率等優(yōu)點。在眾多氟化物中,LaF3納米晶體具有良好的熱穩(wěn)定性和環(huán)境穩(wěn)定性、低的聲子能量(低于350 cm-1)、容易摻雜稀土離子等優(yōu)點。所以研究LaF3發(fā)光材料具有重要的意義。 傳統(tǒng)制備納米材料的方法中多用到各種有機溶劑或模板,這對反應條件的要求相當苛刻,所以找到一種簡便、有效、綠色的合成方法已成為人們追求的目標。室溫離子液體具有綠色環(huán)保,良好的熱穩(wěn)定性,較寬液程等優(yōu)點,可以作為一種良好的反應介質(zhì)滿足無機材料合成的要求。水熱法則是一種有效的合成無機材料的方法,具有以下優(yōu)點：合成的顆粒純度高、分散性好,晶形好且可控制、可通過對反應條件的選擇控制產(chǎn)物的尺寸和形貌,且生產(chǎn)成本低。本文采用離子液體輔助水熱法成功制備了氟化物發(fā)光材料,并研究了其結(jié)構(gòu)和熒光性質(zhì)。 本文的研究內(nèi)容如下： 1、結(jié)合離子液體和水熱法的優(yōu)點,得到了一種簡便、綠色的合成稀土氟化物發(fā)光材料的方法,即離子液體輔助水熱法。在合成過程中,離子液體[bmim]BF4起到共溶劑和提供氟源的作用,在溫度高于120℃時會水解產(chǎn)生F-離子,它與加入的稀土硝酸鹽在180℃生成稀土氟化物發(fā)光材料。 2、通過XRD, FE-SEM對制備的LaF3:RE樣品進行了結(jié)構(gòu)表征,測試結(jié)果表明樣品的顆粒大小為60 nm。LaF3:Er的樣品在980 nm紅外光激發(fā)下,發(fā)射出較強的綠光,通過功率關(guān)系得出其綠光和紅光發(fā)射均為雙光子過程,并討論了其發(fā)光機制。LaF3:Eu(5%)和LaF3:Ce(15%),Tb(5%)樣品在紫外光的激發(fā)下分別能觀察到紅光和綠光發(fā)射。和商業(yè)綠粉對比,通過測試計算出LaF3:Ce(15%),Tb(5%)樣品的熒光量子效率是34%。結(jié)果表明LaF3:RE納米顆粒在高分辨顯示器、放大器和熒光粉等領(lǐng)域有潛在的應用。 3、通過離子液體輔助水熱法制備了LaF3:Ce,Tb樣品,并加入EDTA-2Na控制樣品的形貌和大小。TEM數(shù)據(jù)和XRD估算表明,樣品是直徑為25 nm、厚度為5 nm的圓盤結(jié)構(gòu)。在實驗過程中EDTA-2Na在控制形貌和粒徑大小方面起到了重要作用。系統(tǒng)研究了LaF3:Ce,Tb樣品在254 nm紫外光激發(fā)下的熒光性質(zhì)。結(jié)果表明LaF3:Ce,Tb顆�？梢詰糜谏飿擞浀阮I(lǐng)域。 4、通過離子液體輔助水熱法制備了CaF2:RE納米顆粒,TEM和SEM結(jié)果顯示樣品是球狀結(jié)構(gòu),直徑大約為150 nm。測試和研究了在254 nm激發(fā)下,CaF2:Ce,Tb樣品的熒光性質(zhì)；在397nm激發(fā)下,CaF2:Eu樣品的熒光性質(zhì)；在980 nm激發(fā)下,CaF2:Er樣品的上轉(zhuǎn)換發(fā)光性質(zhì)。結(jié)果表明紅光和綠光的發(fā)射均為雙光子過程,紫光的發(fā)射為三光子過程。
[Abstract]:Up-conversion luminescence has good prospects in the fields of all-solid-state compact laser devices (purple, blue, green), up-conversion phosphors, infrared quantum counters, three-dimensional display, temperature detectors and fluorescent probes of biomolecules, etc. It has always been a research hotspot in luminescent materials. Fluoride is a kind of important upconversion luminescent matrix material, which has the advantages of low phonon energy and high luminous efficiency. Laf3 nanocrystals have many advantages, such as good thermal stability and environmental stability, low phonon energy (less than 350 cm-1) and easy doping of rare earth ions. Therefore, it is of great significance to study La F 3 luminescent materials. Various organic solvents or templates are often used in the traditional methods of preparing nanomaterials, which is very demanding to the reaction conditions. Therefore, finding a simple, effective and green synthesis method has become the goal of people's pursuit. Room temperature ionic liquids have the advantages of green environmental protection, good thermal stability, wide liquid range and so on. They can be used as a good reaction medium to meet the requirements of inorganic materials synthesis. The hydrothermal rule is an effective method for the synthesis of inorganic materials. It has the following advantages: high particle purity, good dispersion, good crystal shape and controllable shape. The size and morphology of the product can be controlled by selecting the reaction conditions. And the production cost is low. Fluoride luminescent materials were successfully prepared by ionic liquid assisted hydrothermal method and their structures and fluorescence properties were studied. The main contents of this paper are as follows: 1. Combining the advantages of ionic liquid and hydrothermal method, a simple and green method for the synthesis of rare earth fluoride luminescent materials, I. e., ionic liquid assisted hydrothermal method, has been obtained. In the process of synthesis, ionic liquid [bmim] BF4 acts as a co-solvent and provides a fluorine source. The rare earth fluoride luminescent material was formed at 180 鈩，

本文編號：2094351