Synthesis, Crystal Structure and Fluorescence Property of a Zinc(Ⅱ) Coordination Polymer with a Theoretical Calculatio

We have designed and synthesized a new luminescent coordination polymer[Zn_(2)(NO_(3))(NCP)_(3)(H2O)_(3)]n·2 nH_(2)O(1,HNCP=2-(2-carboxyphenyl)imidazo-[4,5-f]-1,10-phenanthroline)under hydrothermal conditions,which has been structurally characterized by single-crystal X-ray diffraction analyses.1 crystallizes in monoclinic,space group P2_(1)/n,with a=13.7748(3),b=19.2651(4),c=19.9543(4)Å,β=95.339(2)o,V=5272.35(19)Å^(3),C_(60) H_(39.73) N_(13) O_(13.33) Zn_(2),M_(r)=1286.80,D_(c)=1.621 g/cm^(3),Z=4,μ(Mo Ka)=2.118,F(000)=2629,the final R=0.0598 and w R=0.1483.In 1,the organic ligand NCP-displays two different bridging modes to connect adjacent Zn(II)ions into a 1 D chain along the c-direction.Photoluminescent analyses reveal that 1 exhibits a strong green emission with a fluorescent lifetime of 5.57 ns.The first-principle calculation results show that the luminescence mainly originates from ligand-centered charge transition.

Design and Synthesis of Tb^(3+)-doped KGW Crystal for the Exploration of Scintillation Performance with X-ray Imaging

X-ray scintillators have been widely used in many fields owing to their strong penetrating ability,including security inspection,medical imaging,nuclear cameras,high energy physics and so forth.To explore new scintillation materials,we designed and synthesized KGW:Tb bulk scintillation crystals with monoclinic phase structure.We explored the fluorescence performance of KGW:Tb by testing the photoluminescence spectrum and fluorescence decay curve and observed strong green light emission in the visible light range at room temperature.Moreover,our crystal has a high stability under X-ray irradiation,a good sensitivity response and an appreciable light output(3424 ph/MeV)that is approximately twenty times more than PbWO4.Moreover,we used a 0.98 mm thickness polished crystal sheet for X-ray imaging applications and observed excellent results.Therefore,KGW:Tb crystal may be an important direction for X-ray scintillation detection.

Scintillation Properties of Ce^(3+)/Tb^(3+) Co-doped Oxyfluoride Glass with the Exploration of Imaging Application

Scintillator is a material that converts high-energy rays into visible light, and has great applications in high-energy physics, medical imaging, and security inspections. As a type of scintillator, scintillation glass has the advantages of low cost, high stability, controllable shape, and ability to be prepared on a large scale. In this paper, a traditional fusion quenching method was used to prepare a cerium-terbium co-doped glass. The green characteristic light of Tb ion was observed at 543 nm. Moreover, through the doping sensitization of Ce ions, the luminescence of Tb was successfully enhanced. The material has high X-ray response sensitivity, complete stability and strong X-ray emission intensity. We use a simple X-ray imaging platform for imaging, and the results show that our glass has a spatial resolution of 7.0 lp/mm.