本文選題：鎢酸鹽 + 溶劑熱　； 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：近年來,稀土摻雜上轉(zhuǎn)換發(fā)光材料成為了各國的研究熱點(diǎn)。其中鎢酸鹽就是一種良好的基質(zhì)材料,具有穩(wěn)定的物理化學(xué)性質(zhì),在很多應(yīng)用場合具有不可替代的優(yōu)勢。鎢酸鹽作為一種優(yōu)秀的發(fā)光材料,已經(jīng)在各個(gè)領(lǐng)域已得到了非常廣泛的應(yīng)用。因此,本文研究了稀土摻雜鎢酸鹽發(fā)光材料上轉(zhuǎn)換發(fā)光,主要內(nèi)容以及研究成果如下:1.采用固相法制備了 Er~(3+)摻雜以及Yb~(3+),Er~(3+)共摻的NaY(WO_4)_2熒光粉,并且用X射線衍射和光譜分析表征了制備的發(fā)光粉樣品。在980nm激發(fā)下,NaY(WO_4)_2:Yb~(3+),Er~(3+)樣品呈現(xiàn)明亮的綠色上轉(zhuǎn)換發(fā)光,隨著Yb~(3+)離子摻雜濃度的增加,并沒有提高其光譜中的紅光發(fā)射成分,具有極好的色純度和顏色穩(wěn)定性,其綠色上轉(zhuǎn)換成分非常強(qiáng)。在1550 nm激發(fā)下樣品也呈明亮的綠色發(fā)光,其上轉(zhuǎn)換光譜中的紅光成分比980 nm激發(fā)要高。2.同樣采用固相法制備了NaY(WO_4)_2:Tm~(3+),Er~(3+)共摻的熒光粉,且用X射線衍射和光譜分析表征了制備的發(fā)光粉樣品。在980 nm激發(fā)下樣品呈現(xiàn)綠色上轉(zhuǎn)換發(fā)光,樣品的紅綠比值隨著激發(fā)功率的增加而逐漸減小。其發(fā)光顏色從白光區(qū)域直接移動(dòng)到了綠色區(qū)域,且變化范圍較大。在1550nm激發(fā)下呈現(xiàn)紅色上轉(zhuǎn)換發(fā)光,表現(xiàn)出很強(qiáng)的紅光和紅外光發(fā)射,隨著激發(fā)功率的增加,樣品的紅綠分值比呈現(xiàn)先增加后減小的趨勢。3.采用溶劑熱法制備了 NaLa(WO_4)_2:Yb~(3+),Er~(3+)上轉(zhuǎn)換發(fā)光材料。通過該改變?nèi)芤旱膒H、乙二醇和水的比例、溫度、以及絡(luò)合劑的量對樣品的形貌和上轉(zhuǎn)換發(fā)光性質(zhì)進(jìn)行了分析。在低溫120 ℃成功合成樣品,且形貌規(guī)則,PVP的摻入使得樣品得到了進(jìn)一步的分散,摻雜0.3 g時(shí)分散程度最佳。乙二醇和水的比例為4:1時(shí),樣品呈現(xiàn)規(guī)則的球狀結(jié)構(gòu),顆粒最小,當(dāng)溶液pH達(dá)到10,樣品發(fā)光最強(qiáng)。在980 nm激發(fā)下,樣品的發(fā)光強(qiáng)度相對較強(qiáng),色穩(wěn)定性好,Er~(3+)的最佳摻雜濃度為2 mol%,Yb~(3+)的最佳摻雜濃度為8 mol%。在1550 nm激發(fā)下,樣品的發(fā)光強(qiáng)度相對較弱,Er~(3+)的最佳摻雜濃度為8 mol%,Yb~(3+)的最佳摻雜濃度為16 mol%。
[Abstract]:In recent years, rare-earth doped up-conversion luminescent materials have become the focus of research all over the world. Among them tungstate is a good matrix material with stable physical and chemical properties and has irreplaceable advantages in many applications. Tungstate, as an excellent luminescent material, has been widely used in various fields. Therefore, the upconversion luminescence of rare earth doped tungstate luminescent materials has been studied. The main contents and results are as follows: 1. NaY(WO_4)_2 phosphors doped with Er~(3) and co-doped with Yb~(3 were prepared by solid phase method. The samples were characterized by X-ray diffraction and spectroscopic analysis. Under the excitation of 980nm, the sample of NaYWO _ 4 / C _ 2: Yb _ 2O _ 3 / C ~ (2 +) shows bright green up-conversion luminescence. With the increase of the concentration of Yb~(3), the red emission component in the spectrum has not been improved, and it has excellent color purity and color stability. Its green upconversion component is very strong. The samples also exhibit bright green luminescence under excitation at 1550 nm. The red component in the upconversion spectra is higher than that in the 980nm excitation. The phosphors co-doped with NaY(WO_4)_2:Tm~(3 were also prepared by solid phase method. The samples were characterized by X-ray diffraction and spectroscopic analysis. The sample exhibits green up-conversion luminescence at 980 nm, and the ratio of red to green decreases with the increase of excitation power. Its luminous color moves directly from the white light region to the green area, and the range of variation is large. Under the excitation of 1550nm, red upconversion luminescence was observed, showing strong infrared and infrared emission. With the increase of excitation power, the red and green scores of the samples increased first and then decreased. The upconversion luminescent material of NaLa(WO_4)_2:Yb~(3 _ (+) er ~ (2 +) was prepared by solvothermal method. The morphology and up-conversion luminescence properties of the samples were analyzed by changing the pH of the solution, the ratio of ethylene glycol to water, the temperature and the amount of complexing agent. The samples were successfully synthesized at 120 鈩，

本文編號：1923032