With the pretreatment of pyrolysis, the uniform, smooth, dense and crack free Gd2O3∶Eu3+ films were obtained by sol-gel process without shielding atmosphere. Atomic force microscopy （AFM）, X-ray diffraction （XRD）, Ellipsometry, transmission, photoluminescence and X-ray excited emission were applied to study to the surface morphology, structure, thickness and optical properties of the films. The results show that the films are made up of grains with cubic structure in average size about 22 nm. With 21 times reproducible spin coating and pyrolysis treatment, the thickness of the film could reach to 792 nm and the transmittance of the film in visible region is above 90%. Two peaks at 223 and 250 nm are found in excitation spectra, which correspond to host lattice （HL） excitation and charge transfer （CT） excitation, respectively. Meanwhile, the main peak relates to HL excitation which is contrary to that of Gd2O3∶Eu3+ powder. This phenomenon will be beneficial to radioluminescence. The emission spectra show that the main peak located at 611 nm could be excited either by UV or X-ray, which correspond to （（）7F2→（）5D0） transition in Eu3+ ions. The luminescence intensity at 10 ms is only 10-4 time of that at 10 μs, which means that the afterglow in Gd2O3∶Eu3+ films is insignificant for X-ray imaging.
Several indium borophosphates have been reported recently,including K In[BP 2 O 8 (OH)]( Ⅰ )and NaIn[BP 2 O 8 (OH)]( Ⅱ ).The latter two compounds were synthesized under mild hydrothermal condit ions,and have the same molar ratio(M Ⅰ ∶In∶B∶P∶O∶H)in molecular formula but with different structure types.C ompound Ⅰ crystallizes in the triclinic system with space group P1(No.2), a =0.52638(4)nm, b =0.84791(5)nm, c =0.81469(9)nm,α=91.1741(7)°,β=93.061(7) °,γ=79.823(5)°, V =0.3573nm 3 ,Z=2;while compound Ⅱ possesses a monoclinic structure with space group P 2 1 / n (No.14)with a =0.5177(1)nm, b =1.6815(3)nm, c =0.7684(2)nm,β=94.10(3)°, V =0.6672(2)nm 3 ,Z=4.Eight-membered-ring and six-membered-ring are formed by alterna ting borate,phosphate tetrahedra and In-coordination octahedron sharing corner s via common oxygen atoms in compound Ⅰ and Ⅱ respectively.The polyhedra in the structure are oriented along certain dire ction to form alternating layered fragments.These two structure types can be co nsidered as intergrowth structures,which consist of the same layered fragments growing in different orientations.Other structure intergrowth possibilities are also expected in similar systems.CSD: Ⅰ ,409583; Ⅱ ,413343.
