本文選題：高溫固相 + Li+離子摻雜�。� 參考：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：當今世界能源緊缺,太陽能作為可持續(xù)能源,有望成為未來的主要能源,AZO作為一種新型太陽電池電極,具有優(yōu)秀的光電性能,太陽能電池只能吸收可見光,本文主要采用高溫固相法制備Er3+、Yb3+摻雜AZO陶瓷,使其具有上轉換發(fā)光性能,將紅外光轉換成可見光,并通過在陶瓷中引入Li+離子,進一步加強其上轉換發(fā)光。設計了AZO陶瓷制備的工藝流程,在不同預燒以及成瓷溫度下制備出AZO陶瓷,并通過XRD、SEM、電阻率、霍爾系數、上轉換發(fā)光等手段,測試AZO結構、形貌、電阻率以及發(fā)光的變化,確定了最佳預燒溫度為700℃,最佳成瓷溫度為1300℃。根據AZO陶瓷制備流程,制備出不同Er3+、Yb3+濃度摻雜的AZO陶瓷,在980nm激光器激發(fā)下,得到了明顯的紅光和較弱綠光,并分別研究Er3+以及離子Yb3+濃度對上轉換發(fā)光強度的影響,隨著Er3+離子和Yb3+離子濃度的增加,熒光強度均出現(xiàn)先增強后減弱的現(xiàn)象。對稀土摻雜AZO陶瓷進行了XRD、電阻率、紫外吸收測試,分析了稀土離子對AZO結構,離子占位以及電阻率的影響,紅光功率曲線測定表明紅光發(fā)射為2光子過程,并在此基礎上分析上轉換發(fā)光機制,紅光對應Er3+離子的4F9/2?4I15/2能級躍遷,綠光對應Er3+離子2H11/2/4S3/2?4I15/2能級躍遷。Li+離子的摻入,占據AZO晶格間隙位,改變了晶格對稱性,晶體對稱性的改變減少了稀土離子的無輻射躍遷,加強上轉換發(fā)光,同時,隨Li+離子變化,熒光顏色由紅光向綠光方向移動,測試Li+摻雜AZO紅光和綠光的功率曲線,其紅綠光都為2光子過程,Li+離子并不會改變AZO中稀土離子的發(fā)光機理。通過無交互正交試驗得出Er3+為3mol%,Yb3+為2mol%,Li+為4mol%時,紅光發(fā)射最強,此時熒光單色性較好。
[Abstract]:Nowadays, the world is short of energy. Solar energy, as a sustainable energy, is expected to become the main energy source in the future. AZO, as a new type of solar cell electrode, has excellent photoelectric performance. Solar cells can only absorb visible light. In this paper, Er3 Yb 3 doped AZO ceramics were prepared by high temperature solid state method, which have the properties of up-conversion luminescence. The infrared light was converted into visible light, and the up-conversion luminescence was further enhanced by introducing Li ion into the ceramics. The preparation process of AZO ceramics was designed. The AZO ceramics were prepared at different pre-sintering temperatures. The changes of AZO structure, morphology, resistivity and luminescence were measured by means of XRD-SEM, resistivity, Hall coefficient and up-conversion luminescence. The optimum prefiring temperature is 700 鈩，

本文編號：1803845