title: Synthesis, structure and excitation wavelength dependent PL properties of novel nanocomposite La2O2CO3·CuO·ZnO.
abstract: A novel multi-metal nanocomposite, La2O2CO3·CuO·ZnO has been synthesized by co-precipitation method and characterized by XRD, SEM, EDS and PL spectra. XRD showed the presence of La2O2CO3, CuO and ZnO phases with an average particle size of 20 nm. Excitation at different wavelengths showed PL in UV and visible regions. Excitation at 220-270 nm provided UV emissions. Excitations at 298, 324 and 355 nm showed PL in the violet and blue regions. Excitation at 395 and 450 nm provided green and red luminescence, respectively. It has been found that PL behavior of La2O2CO3·CuO·ZnO is excitation wavelength dependent. This PL property is contrary to well-known Kasha's rule of excitation wavelength dependence of emission spectrum. The excitation peaks at 300-325 (broad band), 353, 371, 394, 408 nm were observed when monitored at 450 nm.
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh. Electronic address: subhan-che@sust.edu.
authors.forename: Md Abdus
authors.initials: MA
authors.lastname: Subhan
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
authors.forename: Tanzir
authors.initials: T
authors.lastname: Ahmed
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
authors.forename: Md Robeul
authors.initials: MR
authors.lastname: Awal
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
authors.forename: Abul Mansur M
authors.initials: AM
authors.lastname: Fahim
mesh_terms: D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D013052:Spectrometry, X-Ray Emission; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D028581:Lanthanoid Series Elements; D015034:Zinc Oxide
keywords: Kasha’s rule; Nanocomposite; Photoluminescence; Rare earth oxide matrix