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激光散射和光电子技术是目前测试液晶特性最先进和可靠的手段.此技术通过静态光散射和动态光散射两种测试方法,测得液晶的分子量、浊度系数、相关长度、相变温度、展矩和扭矩等许多物理参数,因此可判断液晶的类型,了解液晶的结构、形态,相转移及动态变形的过程,为液晶在许多领域的应用提供可靠的理论依据. 相似文献
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Er3+,Ho3+和Tm3+在硫氧化钆中的余辉发光 总被引:1,自引:0,他引:1
The new Er^3 , Ho^3 and Tm^3 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 photolumineseenee spectra, afterglow spectra and afterglow decay curve were examined by fluorescence spectroscopy. The afterglow spectra of Gd2O2S:Er^3 , Mg, Ti showed typical transitions of Er^3 at 528(2H11/2→4I15/2), 548 (^4S3/2 →^4I15/2) and 669 nm (^4F9/2→^4I15/2). In the afterglow spectra of Gd2O2S: Ho^3 , Mg, Ti,typical transitions of Ho^3 at 546 nm (^5S2→^5I8), 651 and 661 nm (^2F5→^5I8) were observed. In Gd2O2S:Tm^3 , Mg,Ti, the afterglow emission at 800 nm (^1G4→^3H5) of Tm^3 was seen. The meehnism and model of afterglow energy transfer were proposed. 相似文献
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BaMgAl10O17:Eu^2+,RE(RE=稀土)荧光体的燃烧法合成和发光性质 总被引:8,自引:0,他引:8
应用燃烧法在空气中在较低的温度(600度)下成功地合成了铝酸盐荧光体BaMgAl10O17:E^2 ,RE0并研究了稀土离子对荧光体发光的影响和作用,第一次观察到荧光体的长余辉发光现象。 相似文献
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WO3-TiO2薄膜型复合光催化剂的制备和性能 总被引:34,自引:0,他引:34
采用溶胶-凝胶法在多孔钛片上制备了WO 相似文献
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