強(qiáng)磁場(chǎng)和雙色激發(fā)對(duì)稀土摻雜微晶玻璃發(fā)光性能的影響
發(fā)布時(shí)間:2018-03-07 00:32
本文選題:稀土離子 切入點(diǎn):微晶玻璃 出處:《浙江大學(xué)》2015年碩士論文 論文類型:學(xué)位論文
【摘要】:具有光磁相互作用的光磁雙功能材料由于可能應(yīng)用于開(kāi)發(fā)新型光磁多功能器件而引起人們的極大興趣,雙色激光激發(fā)稀土離子產(chǎn)生寬帶高效上轉(zhuǎn)換發(fā)光可能應(yīng)用于太陽(yáng)能電池而具備很大的研究?jī)r(jià)值。本文研究了脈沖強(qiáng)磁場(chǎng)和雙色激光作用對(duì)稀土離子摻雜的氟氧化物微晶玻璃的發(fā)光性能的影響,對(duì)所觀察到的現(xiàn)象進(jìn)行分析,探討了其背后的形成機(jī)理。具體包括以下幾個(gè)方面:1.強(qiáng)磁場(chǎng)對(duì)Eu3+離子摻雜微晶玻璃發(fā)光性能的影響。我們采用高溫熔融法和熱處理成功制備了Eu3+離子摻雜的含SrF2納米晶的微晶玻璃,研究了在77K低溫下,外加脈沖強(qiáng)磁場(chǎng)(0-42 T)對(duì)樣品的發(fā)光性能的影響。研究發(fā)現(xiàn),在392nm激光的激發(fā)下,Eu3+離子的積分發(fā)光強(qiáng)度隨著外加磁場(chǎng)的增強(qiáng)而減弱,詳細(xì)分析發(fā)現(xiàn)Eu3+離子的’D0→7F1、5D0→7F2和5D0→7F4三個(gè)發(fā)射帶的積分發(fā)光強(qiáng)度都隨著外加磁場(chǎng)的增強(qiáng)而減弱。我們認(rèn)為發(fā)生這種現(xiàn)象的原因是Eu3+離子在磁場(chǎng)下發(fā)生塞曼分裂的協(xié)同效應(yīng)。此外,在磁場(chǎng)較強(qiáng)時(shí),能級(jí)的塞曼分裂也導(dǎo)致發(fā)光峰位出現(xiàn)了藍(lán)移和紅移。由于樣品發(fā)光對(duì)磁場(chǎng)強(qiáng)度的敏感度,我們所制備的材料有望應(yīng)用于磁場(chǎng)探測(cè)等領(lǐng)域。2.強(qiáng)磁場(chǎng)作用下Eu3+離子摻雜微晶玻璃磁致光滯現(xiàn)象的研究。我們用高溫熔融法和熱處理,分別得到了含SrF2或者NaYF4納米晶的氟氧化物微晶玻璃樣品。我們研究了玻璃和微晶玻璃在低溫(80 K)強(qiáng)磁場(chǎng)下(0-39 T)的發(fā)光性能,觀察到在磁場(chǎng)處于上升期時(shí),Eu3+離子的發(fā)光強(qiáng)度隨磁場(chǎng)強(qiáng)度的增強(qiáng)而減弱,當(dāng)磁場(chǎng)處于下降期時(shí),Eu3+離子的發(fā)光強(qiáng)度則隨磁場(chǎng)強(qiáng)度的減小而增強(qiáng),并且發(fā)光強(qiáng)度的變化總是落后于磁場(chǎng)的變化。當(dāng)磁場(chǎng)減小到OT后,發(fā)光強(qiáng)度并沒(méi)有回到未施加磁場(chǎng)時(shí)的初始值,而是比初始值要略大一些。我們對(duì)所觀察到的磁致光滯現(xiàn)象進(jìn)行分析,認(rèn)為這跟基質(zhì)中的Eu3+離子被磁化有關(guān)。我們制備的材料有望應(yīng)用于開(kāi)發(fā)新型光磁雙功能器件,對(duì)以后研究光磁雙功能材料有重要參考意義。3.雙色激光激發(fā)對(duì)Ho3+離子摻雜微晶玻璃發(fā)光性能的影響。我們研究了Ho3+離子摻雜的含NaYF4納米晶微晶玻璃在單色和雙色激光激發(fā)時(shí)的發(fā)光性能。我們觀察到,當(dāng)用980 nm或1150nm激光單獨(dú)激發(fā)該樣品時(shí),發(fā)光極其微弱;而當(dāng)用980 nm和1150 nm激光同時(shí)激發(fā)時(shí),樣品發(fā)出了明亮的紅光和相對(duì)微弱的綠光。我們認(rèn)為這種熒光增強(qiáng)的主要原因是:在單色激光激發(fā)時(shí),上轉(zhuǎn)換發(fā)光機(jī)理主要是激發(fā)態(tài)吸收(ESA),而在雙色激光激發(fā)時(shí),上轉(zhuǎn)換發(fā)光則轉(zhuǎn)變成主要依賴于能量傳遞上轉(zhuǎn)換(ETU),而ETU過(guò)程的上轉(zhuǎn)換效率是所有上轉(zhuǎn)換方式中最高的。我們也觀察到了隨著Ho3+離子摻雜濃度的提高,5F5→5I8躍遷發(fā)光強(qiáng)度逐漸變?nèi)?而其峰中心的位置也向長(zhǎng)波長(zhǎng)移動(dòng)?傊,雙色激光激發(fā)的上轉(zhuǎn)換發(fā)光強(qiáng)度比單色激光激發(fā)時(shí)增強(qiáng)很多,這有望實(shí)現(xiàn)寬帶高效上轉(zhuǎn)換發(fā)光,從而應(yīng)用于太陽(yáng)能電池等領(lǐng)域。
[Abstract]:Optomagnetic bifunctional materials with optomagnetic interaction have attracted great interest due to their potential applications in the development of novel optomagnetic multifunctional devices. Two-color laser excitation rare earth ions to produce broadband high efficiency upconversion luminescence may be used in solar cells and has great research value. In this paper, the effect of pulsed strong magnetic field and two-color laser on fluoridation of rare earth ions doped by rare earth ions has been studied. Effect of luminescence properties of glass ceramics, An analysis of the observed phenomena, The formation mechanism behind it was discussed, including the following aspects: 1. The effect of high magnetic field on the luminescence properties of Eu3 ion-doped glass-ceramics. We successfully prepared SrF2 doped with Eu3 ion by high temperature melting and heat treatment. Nanocrystalline glass-ceramics, The effect of applied high magnetic field (0 ~ 42 T) on the luminescence properties of the samples at 77K was studied. It was found that the integrated luminescence intensity of EU _ 3 ion decreased with the enhancement of magnetic field under the excitation of 392nm laser. It was found that the D0 of Eu3 ion was analyzed in detail. 鈫,
本文編號(hào):1577204
本文鏈接:http://www.sikaile.net/kejilunwen/huaxuehuagong/1577204.html
最近更新
教材專著