KAUST DepartmentAdvanced Membranes and Porous Materials Research Center
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AbstractExploring the native defects of zeolites is highly important for understanding the properties of zeolites, such as catalysis and optics. Here, ITQ-16 films were prepared via the secondary growth method in the presence of Ge atoms. Various intrinsic defects of ITQ-16 films were fully studied through photoluminescence and FTIR characterizations. It was found that both the as-synthesized and calcined ITQ-16 films displayed multicolor photoluminescence including ultraviolet, blue, green and red emissions by exciting upon appropriate wavelengths. The results indicate that Si―OH and non-bridging oxygen hole centers(NBOHCs) are responsible for the origin of green and red emissions at 540―800 nm, while according to a variety of emission bands of calcined ITQ-16 film, blue emission bands at around 446 and 462 nm are attributed to peroxy free radicals(≡SiO2), ultraviolet emissions ranging from 250 nm to 450 nm are suggested originating from a singlet-to-triplet transition of two-fold-coordinated Si and Ge, respectively. © 2016, Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH.
CitationChen Y, Dong X, Zhang Z, Feng L (2016) Multicolor photoluminescence in ITQ-16 zeolite film. Chemical Research in Chinese Universities 32: 713–718. Available: http://dx.doi.org/10.1007/s40242-016-6079-5.
SponsorsSupported by the Postdoctoral Science Foundation of China(No.2013M541716), the Postdoctoral Science Foundation of Jiangsu Province, China(No.1301055C) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, the Ministry of Education of China(No.K510900314).