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(PL) were used to determine the emission behavior and surface defects in the materials. In PL spectra, the intensity of UV peak of ZnO/ZnS is lowered than that of ZnO while in case of ZnO/ZnS/α-Fe2O3... at the x-axis gives the band gap values, which are found to be 3.0, 2.85 and 2.65 eV for ZnO, ZnO/ZnS and ZnO/ZnS/α-Fe2O3 materials, respectively. Room temperature PL spectra of ZnO, ZnO/ZnS, and ZnO/ZnS......
TiO2光催化剂,采用XRD,PL,DRS和BET等技术进行催化剂性能的表征.在光源为高压汞灯和氙灯,Fe3+为电子受体,悬浮液pH值为2.0的条件下,考察W掺杂对金红石型TiO2的光催化分解水析氧活性的影响.结果表明:当W掺杂量为1.0%~4.0%(摩尔分数)时,W掺杂没有引起金红石型TiO2晶型的改变,表面形成氧空位,在导带底附近形成施主能级,有利于光生电子和空穴的分离,掺杂催化剂光致发光强度与... were characterized by XRD, PL, DRS and BET. Using Fe3+ as electron acceptor, under condition of pH=2.0, UV irradiation and visible radiation, the effect of W doping concentration on the photocatalytic......
Engineering Laboratory for Optical Conversion Materials and Technology,Lanzhou University摘 要:The multicolor photoluminescence(PL) of a Tb3+singly activated NaYGeO4 phosphor is prepared by solid state method.For the first time,it is reported that the PL color of Tb3+in NaYGeO4 phosphor can be tuned from green to blue and,finally,to red by controlling the Tb3......
Engineering Laboratory for Optical Conversion Materials and Technology,Lanzhou University摘 要:The multicolor photoluminescence(PL) of a Tb3+singly activated NaYGeO4 phosphor is prepared by solid state method.For the first time,it is reported that the PL color of Tb3+in NaYGeO4 phosphor can be tuned from green to blue and,finally,to red by controlling the Tb3......
between Cd2+ and sulfhydryl group. Furthermore, the absorption wavelength, full width at half maximum (FWHM), stokes shift, photoluminescence (PL) quantum yield and PL stability of TGA-CdTe.... The photoluminescence (PL) spectra of CdTe QDs were monitored by using a Hitachi F-4500 FL spectrophotometer and an excitation wavelength of 450 nm was used in this process. The TEM images were taken......
采用溶胶-水热法合成掺La的TiO2纳米粒子及其表征 付宏刚1,屈宜春1,孙志华1,王百齐1,井立强1 (1.黑龙江大学化学化工与材料学院物理化学重点实验室,哈尔滨,150080) 摘要:采用溶胶-水热法制备了不同掺杂的二氧化钛纳米粒子,并用表面光电压谱(SPS)和荧光光谱(PL)等对样品进行了表征,重点考察了La的量和焙烧温度对样品表面光电和光致发光以及光催化活性等的影响,并对它们之间的内在关系进行了探讨.结果表明:在合适的焙烧温度下,适量镧的掺杂能够提高二氧化钛的光催化活性.样品的SPS谱和PL光谱与光催化活性之间存在一定的关系,即SPS和PL信号越强,光生电子和空穴分离效率越高,光催化活性越高. 关键词:TiO2; 溶胶-水热法; La; 掺杂; 光催化; [全文内容正在添加中] ......
℃. Characterizations of the products were carried out by combined means of XRD, FT-IR, FE-SEM and PL analysis. The precursors could be modulated from basic-carbonate submicron spheres to normal carbonate... was observed for the microplates, yielding more enhanced exposure of the (400) facets. Both the (Y0.95Eu0.05)2O3 spheres and microplates exhibit nearly identical positions of the PL bands and similar......
investigated by X-ray diffraction (XRD), atomic force microcopy (AFM) and photoluminescence (PL). The results indicate that both of the microstructure and luminescence are found to be dependent on Er3... of 8.4 nm (not shown here). The difference of the crystalline quality should be associated with the oxygen-deficient nonstoichiometry in B-site doped films. 3.3 UC photoluminescence The PL spectra......
-ray (EDX), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy, Fourier transform infrared (FTIR) spectra and vibrating sample.... The EDX analysis with an accelerating voltage of 20 kV was done. Room temperature photoluminescence (PL) was studied on a Perkin Elmer (LS 55) fluorescence spectrophotometer. Fourier transform infrared......
electron microscopy (SEM) and the optical properties of the ZnO nanostructure were studied by Raman and photoluminescence (PL) spectra, which confirms the high crystal quality of ZnO microstructure...) and (c)), were prepared. Figure 4 shows the room temperature emission spectra of ZnO microcrystals dispersed in ethanol. The as-synthesized ZnO displays three PL emissions: an ultraviolet (UV......
