【作者】 宋春燕；

【导师】 刘应亮；

【作者基本信息】 暨南大学 ， 无机化学， 2004， 硕士

【摘要】 非放射性长余辉发光材料是一类环保型的应用材料，作为美化和清洁光源在紧急突发事件的照明设施、夜光油漆等众多领域得到越来越广泛的应用。其中，绿色和蓝色长余辉磷光粉的制备工艺已逐渐趋向成熟，使人们把重点放在了非放射性红色系列长余辉磷光粉的合成及其性能的研究上。红光既是夜间显示和室内装潢的重要颜色，也是绿色植物光合作用的主要来源。因此合成具有优良耐候性的新型红色系列长余辉发光材料具有广泛的应用前景和重要的社会价值。 本论文侧重于寻找稀土离子掺杂的新型长余辉发光材料，表征了其结构和发光特性。主要目的是合成出长波红色（包括橙色）硫氧化物体系（Gd₂O₂S和La₂O₂S）长余辉磷光粉，另外也对卤氧化钇体系发光材料进行探索。在铕掺杂的卤氧化钇体系YOX（X=F、Cl、Br）中虽然没有发现长余辉现象，但得到该体系中Eu²⁺的价态稳定和转换的新现象。经过系统的研究总结得到以下的结论与成果： 1)采用高温固相反应法合成了一系列稀土离子掺杂的硫氧化镧发光粉，发现了该体系中Eu³⁺的长余辉发光，从而得到一种迄今未见文献报道的红色长余辉发光材料：La₂O₂S：Eu³⁺，Mg，Zr； 2)在Gd₂O₂S，Mg，Ti磷光粉中观察到橙色的长余辉发光现象； 3)采用高温固相反应法合成了一系列稀土离子掺杂的硫氧化钆磷光粉，在掺杂Eu³⁺、Sm³⁺、Tm³⁺、Yb³⁺、Dy³⁺、Er³⁺、Nd³⁺、Ho³⁺的Gd₂O₂S中观察到红色和橙色长余辉发光； 4)首次采用微波法合成了Gd₂O₂S：Sm³⁺，Mg，Ti磷光粉，该磷光粉经紫外或可见光激发后呈现明显的橙红色长余辉发光； 5)在YOX（X=F、Cl、Br）中同时观察到Eu²⁺和Eu³⁺的发射，系统研究了基质、添加剂及反应气氛对Eu价态和发光的影响。更多还原

【Abstract】 The non-radioactive long afterglow phosphor is a kind of environmental application material which has been used in more and more extensive fields such as light sources in emergency, luminous paint and so on. In the long afterglow materials research, the preparation technology of blue and green phosphors has been mature, so the researchers are making more scientific studies on the preparation and property of non-radioactive persistent red-phosphors. The red light is not only the important color of night displays and interior decoration but also is the principal source of green plants photosynthesis. So persistent red-phosphors with good weather resisting property have extensive application prospect and it is very important to get those long afterglow materials.In order to find out some new long-wavelength persistent phosphors, we prepared many oxysulfide (Gd2O2S La2O2S )phosphors doped with rare earth ions and yttrium oxyhalide fluorescent materials doped with europium ions. By plenty of experiment research and generalization, our present work has got some interesting results:1) Lanthanum oxysulfide phosphors doped with rare earth ions were synthesized by the high-temperature solid-state reaction method. These phosphors were characterized by X-ray diffraction, photoluminescence spectra, afterglow spectra, afterglow decay curve and thermoluminescence spectra. We found out one kind of new orange-red long afterglow material La2O2S: Eu3+, Mg, Zr.2) In the phosphor Gd2O2S, Mg, Ti which was prepared by high-temperature solid-state method, the orange afterglow phenomenon can be seen after illuminated with UV light.3) Using the high-temperature solid-state method, Gadolinium oxysulfide phosphors doped with rare earth ions were synthesized. We can observe the red or orange phosphorescence in Gd2O2S doped with Eu3+, Sm3+, Tm3+, Yb3+, Dy3+, Er3+, Nd3+or Ho3+. This is a new result of the long afterglow phosphors research.4) Using the microwave radiation method, the new Sm3+ doped gadolinium oxysulfide phosphor, which has the orange-red long afterglow emission after illuminated with UV light or visible light, was synthesized for the first time.5) In fluorescent materials YOX(X=F,Cl,Br) doped with europium ions, the long afterglow phenomenon wasn’t observed but the blue luminescence of Eu2+ and red luminescence of Eu3+ are simultaneously examined. This is a new result of the valence stability and change of Eu2+ in yttrium oxyhalide .We systematically studied the effects of the host, addition agents and reaction atmosphere on the valence change and fluorescence property of europium ions.更多还原