稀土掺杂氧化物反蛋白石光子晶体的制备及其上转换发光性能
发布时间：2019-01-04 10:57
【摘要】：光子晶体作为一种纳米尺度的材料,自从其被提出以来这种有序的具有孔洞结构的周期性材料就备受关注。光子晶体具有光子带隙和光子局域等特性,可以调制材料的发光性能,在光催化、太阳能、检测、激光、显示等方面具有巨大的应用潜力。本文以溶胶-凝胶法制备了稀土掺杂的Bi2WO6纳米粉和Ba TiO3反蛋白石光子晶体,并对其上转换发光性能进行了研究,具体如下:(1)以柠檬酸(CA)和乙二胺四乙酸(EDTA)作为螯合剂,采用溶胶-凝胶法制备Bi2WO6:Yb3+,Tm3+前驱体溶胶,通过调节螯合剂的用量得到当Bi2WO6:EDTA:CA=1mol:2mol:0mol时能够获得流动性较好的前驱体溶胶,并且经过450℃,4h烧结能够制得纯相的钨酸铋纳米粉。制备了Yb3+,Tm3+掺杂比例分别为4%:1%、6%:1%、8%:1%、10%:1%的Bi2WO6:Yb3+,Tm3+纳米粉。在980nm红外光激发下得到455nm、480nm、656nm和686nm上转换发光,对比发现:当Yb3+,Tm3+的掺杂浓度为Yb3+:Tm3+=6%:1%时,Bi2WO6:Yb3+,Tm3+纳米粉的发光最强,并对其上转换发光机制进行了研究,分别对应1D2→3F4(455nm)、1G4→3H6(480nm)、1G4→3F4(656nm)以及3F2→3H6(686nm)能级跃迁过程。(2)采用流速可控垂直沉积自组装(FCVD)法制备三维聚苯乙烯(PS)蛋白石光子晶体,溶胶-凝胶方法制备BaTiO3:Yb3+,Er3+,Tm3+前驱体溶胶,通过旋涂法将BaTiO3:Yb3+,Er3+,Tm3+前驱体溶胶填充到PS蛋白石光子晶体的空隙中,室温陈化24h后进行高温煅烧以去除PS微球,最后得到带隙分别位于470nm和635nm的纯相的BaTiO3:Yb3+,Er3+,Tm3+反蛋白石光子晶体(IOPC),分别标记为IOPC1和IOPC2。采用980nm激光激发样品,Tm3+发出480nm的光,Er3+发出525nm、550nm和660nm的光。比较反蛋白石样品与无序样品发现:在IOPC1中,480nm的蓝光自发辐射与光子带隙重叠,蓝光发射受到了抑制,而525nm、550nm的绿光得到了增强。激发过程的研究表明:由于光子带隙对自发辐射的抑制作用,蓝光480nm(Tm3+:1G4→3H6)减弱,进而导致能量逆传递(EBT)过程:1G4(Tm3+)+4I15/2(Er3+)→3F4(Tm3+)+4F9/2(Er3+)增强,随后通过交叉驰豫(CR)过程:24F9/2→4I11/2+2H11/2/4S3/2+声子能量导致Er3+在能级2H11/2和4S3/2的布居增多,525nm和552nm的绿光发射增强。在光子带隙为635nm的IOPC2中,660nm自发辐射与光子带隙部分重叠,抑制了660nm的上转换发光,能量传递(ET):4F9/2(Er3+)+3F4(Tm3+)→4I15/2(Er3+)+1G4(Tm3+)就会增强,进而1G4的布居增多,480nm发光增强,同时,CR:4F9/2+4I13/2→4S3/2+4I15/2+声子能量也会增强,Er3+在能级4S3/2的布居增多,552nm的绿光发射增强。
[Abstract]:As a nanoscale material, photonic crystals have attracted much attention since they were proposed. Photonic crystals with photonic bandgap and photonic localization can modulate the luminescent properties of materials and have great application potential in photocatalysis, solar energy, detection, laser, display and so on. In this paper, rare earth doped Bi2WO6 nano-powders and Ba TiO3 opal photonic crystals were prepared by sol-gel method, and their up-conversion luminescence properties were studied. The main contents are as follows: (1) Bi2WO6:Yb3, Tm3 precursor sol was prepared by sol-gel method with citrate (CA) and ethylenediamine tetraacetic acid (EDTA) as chelating agents. The precursor sol with good fluidity can be obtained by adjusting the amount of chelating agent, and the pure bismuth tungstate powder can be prepared by sintering at 450 鈩，
本文编号：2400191
[Abstract]:As a nanoscale material, photonic crystals have attracted much attention since they were proposed. Photonic crystals with photonic bandgap and photonic localization can modulate the luminescent properties of materials and have great application potential in photocatalysis, solar energy, detection, laser, display and so on. In this paper, rare earth doped Bi2WO6 nano-powders and Ba TiO3 opal photonic crystals were prepared by sol-gel method, and their up-conversion luminescence properties were studied. The main contents are as follows: (1) Bi2WO6:Yb3, Tm3 precursor sol was prepared by sol-gel method with citrate (CA) and ethylenediamine tetraacetic acid (EDTA) as chelating agents. The precursor sol with good fluidity can be obtained by adjusting the amount of chelating agent, and the pure bismuth tungstate powder can be prepared by sintering at 450 鈩，
本文编号：2400191
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