【摘要】：稀土釩酸鹽發(fā)光材料在紫外光的照射下能較好地吸收并能將能量有效地傳遞給稀土活性離子,進而發(fā)出不同活性離子的特征光譜。用磷酸根替代部分釩酸根形成的磷釩酸鹽固溶體作為熒光粉的基質(zhì)材料,能夠提高熒光粉的發(fā)光強度、量子效率及穩(wěn)定性。本論文采用水熱法合成了具有新型結(jié)構(gòu)和形貌的稀土磷釩酸鹽發(fā)光材料(如核-殼,納米棒狀堆簇,納米片狀堆簇的類球狀結(jié)構(gòu)),考察了合成參數(shù)和反應(yīng)條件對材料結(jié)構(gòu)和形貌的影響,研究了其自組裝微米球的生長機理和發(fā)光性能。獲得了以下主要的研究結(jié)果。采用水熱法合成了四方相結(jié)構(gòu)的稀土磷釩酸釔固溶體,研究了P/V摩爾比.EDTA的量、溶液pH值、不同絡(luò)合劑和反應(yīng)時間對樣品結(jié)構(gòu)和形貌的影響。在P/V=3/7、 EDTA=4 mmol、母液pH值為0.57-1的反應(yīng)條件下,在180℃水熱晶化24 h,合成了球形的四方相的固溶體。以YP0.3V0.7O4微米球為基質(zhì),引入不同的稀土離子(Eu、Sm、Dy和Tm),在紫外光的照射下,樣品呈現(xiàn)出不同的顏色�？疾炝蒜鐫舛�、熒光壽命以及量子效率。結(jié)果發(fā)現(xiàn),YP0.3V0.704:Sm3+熒光粉具有較長的熒光壽命和高的量子效率。在YPxV1-xO4基質(zhì)里摻雜Dy3+和x=0.4～0.6時,制備的材料呈現(xiàn)白光。隨著產(chǎn)物中P含量的逐漸增加,Dy3+的發(fā)射強度也在逐漸增大,量子效率可達92%。用EDTA和絡(luò)合劑PVP雙配體的作用下,用水熱法制備了核殼結(jié)構(gòu)的四方相磷釩酸釔材料。通過對反應(yīng)參數(shù)的調(diào)控,制得了不同尺寸和形貌的YP0.3V0.7O4熒光粉。當溶劑的水/乙醇為5：3時,制備的顆粒粒徑為500 nm。摻雜稀土活性離子(Eu和Dy),得到樣品的猝滅濃度分別為5%和3%。
[Abstract]:Rare earth vanadate luminescent materials can absorb and transfer energy effectively to rare earth active ions under ultraviolet light, and then emit characteristic spectra of different active ions. The phosphovanadate solid solution formed by replacing some vanadate with phosphate can improve the luminescence intensity, quantum efficiency and stability of phosphor. In this paper, a novel structure and morphology of rare earth phosphovanadate luminescent materials, such as core-shell, nanorod clusters, were synthesized by hydrothermal method. The effects of synthesis parameters and reaction conditions on the structure and morphology of the nanoclusters were investigated. The growth mechanism and luminescence properties of the self-assembled microspheres were studied. The following main results are obtained. The tetragonal phase structure solid solution of yttrium phosphate vanadate was synthesized by hydrothermal method. The effects of the molar ratio of P / V, pH value of solution, different complexing agent and reaction time on the structure and morphology of the sample were studied. A spherical tetragonal solid solution was synthesized by hydrothermal crystallization at 180 鈩，

本文編號：2270832