Desai Netaji K, Mahajan Prasad G, Bhopate Dhanaji P, Dalavi Dattatray K, Kamble Avinash A, Gore Anil H, Dongale Tukaram D, Kolekar Govind B, Patil Shivajirao R
Fluorescence Spectroscopy Research Laboratory, Department of Chemistry, Shivaji University, Kolhapur, 416 004, India.
School of Nanoscience and Biotechnology, Shivaji University, Kolhapur, 416 004, India.
J Fluoresc. 2018 Jan;28(1):51-63. doi: 10.1007/s10895-017-2172-5. Epub 2017 Oct 2.
A simple solid state reaction technique was employed for the preparation of polycrystalline luminophors of p-terphenyl containing different amounts of perylene followed by spectral characterization techniques viz. XRD, SEM, TGA-DSC, UV-Visible spectroscopy, thermo-electrical conductivity, fluorescence spectroscopy, fluorescence life time spectroscopy and temperature dependent fluorescence. X-ray diffraction profiles of the doped p-terphenyl reveal well-defined and sharp peaks indicate homogeneity and crystallinity. The SEM micrograph of pure p-terphenyl exhibit flakes like grains and then compact and finally gets separately with perylene amounts. The observed results indicate that closed packed crystal structures of doped p-terphenyl during crystal formation. The band gaps estimated from UV-visible spectroscopy decreased from 5.20 to 4.10 eV, while thermo-electrical conductivity increases with perylene content. The fluorescence spectra showed partial quenching of p-terphenyl fluorescence and simultaneously sensitization of perylene fluorescence at the excitation wavelength of p-terphenyl (290 nm) due to excitation energy transfer from p-terphenyl to perylene. The observed sensitization results are in harmony with intense blue color seen in fluorescence microscopy images and has high demand in scintillation process.
采用一种简单的固态反应技术制备了含有不同量苝的对三联苯多晶发光体，随后采用光谱表征技术，即X射线衍射（XRD）、扫描电子显微镜（SEM）、热重-差示扫描量热法（TGA-DSC）、紫外-可见光谱、热导率、荧光光谱、荧光寿命光谱和温度相关荧光。掺杂对三联苯的X射线衍射图谱显示出清晰且尖锐的峰，表明其具有均匀性和结晶性。纯对三联苯的扫描电子显微镜微观图呈现出片状颗粒，然后变得致密，最终随着苝含量的增加而分离。观察结果表明，掺杂对三联苯在晶体形成过程中具有密堆积晶体结构。由紫外-可见光谱估计的带隙从5.20电子伏特降至4.10电子伏特，而热导率随苝含量的增加而增加。荧光光谱显示，在对三联苯的激发波长（290纳米）处，对三联苯荧光部分猝灭，同时苝荧光由于激发能量从对三联苯转移到苝而被敏化。观察到的敏化结果与荧光显微镜图像中看到的强烈蓝色一致，并且在闪烁过程中有很高的需求。
