The new Er3+, Ho3+ and Tm3+ doped gadolinium oxysulfide phosphors with the long afterglow emission were synthesized by solid-state reaction method. The synthesized phosphors were characterized by X-ray diffraction. Th...The new Er3+, Ho3+ and Tm3+ doped gadolinium oxysulfide phosphors with the long afterglow emission were synthesized by solid-state reaction method. The synthesized phosphors were characterized by X-ray diffraction. The excitation and photoluminescence spectra, afterglow spectra and afterglow decay curve were examined by fluorescence spectroscopy. The afterglow spectra of Gd2O2S∶Er3+, Mg, Ti showed typical transitions of Er3+ at 528 (2H11/2 → 4I15/2),548 (4S3/2 → 4I15/2) and 669 nm (4F9/2 → 4I15/2). In the afterglow spectra of Gd2O2S∶ Ho3+, Mg, Ti, typical transitions of Ho3+ at 546 nm (5S2 → 5I8), 651 and 661 nm (5F5 → 5I8) were observed. In Gd2O2S∶Tm3+, Mg, Ti, the afterglow emission at 800 nm (1G4 → 3H5) of Tm3+ was seen. The mechnism and model of afterglow energy transfer were proposed.展开更多
研究了氯化铵焙烧法氯化氧化钆制备无水氯化钆的适宜条件和动力学。结果表明:采用氯化铵焙烧氯化氧化钆制备无水氯化钆的适宜条件为nNH4Cl∶nGd2O3=12∶1、T=340~350℃和t=40 min,氧化钆的氯化率为100%;氯化铵与氧化钆的物质的量之比...研究了氯化铵焙烧法氯化氧化钆制备无水氯化钆的适宜条件和动力学。结果表明:采用氯化铵焙烧氯化氧化钆制备无水氯化钆的适宜条件为nNH4Cl∶nGd2O3=12∶1、T=340~350℃和t=40 min,氧化钆的氯化率为100%;氯化铵与氧化钆的物质的量之比是影响氯化率的最主要因素,使用过量的氯化铵是制备高纯度无水氯化钆的关键。氯化反应是气-固多相区域反应,动力学曲线符合Bagdasarrym模型,反应进度遵从Erofeev方程ln[-ln(1-αRE)]=lnk+nlnt,反应的表观活化能Ea为68.254 k J·mol^-1,频率因子A0为1.3×10^5,氯化反应的过程限制环节属于界面化学反应控制。展开更多
文摘The new Er3+, Ho3+ and Tm3+ doped gadolinium oxysulfide phosphors with the long afterglow emission were synthesized by solid-state reaction method. The synthesized phosphors were characterized by X-ray diffraction. The excitation and photoluminescence spectra, afterglow spectra and afterglow decay curve were examined by fluorescence spectroscopy. The afterglow spectra of Gd2O2S∶Er3+, Mg, Ti showed typical transitions of Er3+ at 528 (2H11/2 → 4I15/2),548 (4S3/2 → 4I15/2) and 669 nm (4F9/2 → 4I15/2). In the afterglow spectra of Gd2O2S∶ Ho3+, Mg, Ti, typical transitions of Ho3+ at 546 nm (5S2 → 5I8), 651 and 661 nm (5F5 → 5I8) were observed. In Gd2O2S∶Tm3+, Mg, Ti, the afterglow emission at 800 nm (1G4 → 3H5) of Tm3+ was seen. The mechnism and model of afterglow energy transfer were proposed.
基金supported by the National Basic Research Program of China (973 Program 2010CB732302+5 种基金 2012CB215500)the National High Technology Research and Development Program of China (863 Program 2011AA050704)the National Natural Science Foundation of China (21376238 21306189 51101146)~~
文摘研究了氯化铵焙烧法氯化氧化钆制备无水氯化钆的适宜条件和动力学。结果表明:采用氯化铵焙烧氯化氧化钆制备无水氯化钆的适宜条件为nNH4Cl∶nGd2O3=12∶1、T=340~350℃和t=40 min,氧化钆的氯化率为100%;氯化铵与氧化钆的物质的量之比是影响氯化率的最主要因素,使用过量的氯化铵是制备高纯度无水氯化钆的关键。氯化反应是气-固多相区域反应,动力学曲线符合Bagdasarrym模型,反应进度遵从Erofeev方程ln[-ln(1-αRE)]=lnk+nlnt,反应的表观活化能Ea为68.254 k J·mol^-1,频率因子A0为1.3×10^5,氯化反应的过程限制环节属于界面化学反应控制。