1 Lead Tungstate /Zinc Oxide Heterostructure Nanocomposites: Luminescent Properties Under UV/Red Laser Excitation 1 Recently, there has been an increase in the ability to adjust the optical band gap and enhance the brightness of luminescence in nanophosphors that are utilized in light-emitting diodes and detectors. In this study, a dual oxide composite of erbium-doped lead tungstate/Ag-doped zinc oxide (PWO: Er/ZnO: Ag) heterostructures have been synthesized via a simple chemical method, and the structural and optical properties have been investigated. The effect of excitation wavelength (Landa Landaex) and excitation source was studied on the luminescence properties of the synthesized composite nanoparticle (NPs) at room temperature. Under UV illumination, doped nanocomposite demonstrated strong emission in the blue-green region compared to the pure sample at Landa Landaex=270-280 nm. XRD and EDX results confirmed the existence of PWO and ZnO in the dual composite structure along with the related components. The results demonstrate that mixed-dimensional heterostructures could be developed for high-performance optoelectronic devices using this method. 70 73 Maryam Hosseinpour Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University Semnan, Iran and Nanomaterials and Nanotechnology Research Centre (CINN) (CSIC-Universidad de Oviedo), Principado de Asturias, 33940, El Entrego Spain hosseinpour.maryam@semnan.ac.ir Hassan Abdoos Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University Semnan Iran h.abdoos@semnan.ac.ir Sanaz Alamdari Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University Semnan Iran s.alamdari@semnan.ac.ir Omid Mirzaee Department of Materials and Metallurgical Engineering, Semnan University, Semnan Iran o_mirzaee@semnan.ac.ir José Luis Menéndez Centro de Investigación en Nanomateriales y Nanotecnología, Consejo Superior de Investigaciones Científicas (CSIC)-Universidad de Oviedo (UO), Principado de Asturias, Avenida de La Vega 4-6 El Entrego, San Martin Del Rey Aurelio, Asturias, 33940 Spain jl.menendez@cinn.es Fluorescence Photoluminescence PWO/ZnO Heterostructure Nanocomposites Doping [1] S. 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