Synthesis And Optical Properties Of ZnO/CdS Quantum Dots For LED Application

In this paper, a more simple and convenient method for the synthesis of ZnO quantum dots, ZnO / CdS quantum dots in mesoporous material SBA-15 channels in the growth of ZnO / CdS quantum dots. The structures and optical properties of as-prepared products were thoroughly characterized using photoluminescence (PL), thermogravimetry differential thermal analysis (TG-DTA), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM), UV-Vis spectra, electron paramagnetic resonance (EPR), and X-ray diffraction (XRD), respectively. The results are summarized as follows.Liquid through a relatively simple preparation of the ZnO quantum dots. The quantum dot diameter 3 ~ 5nm, in the 200-540 nm wavelength range with good absorption properties, and by adjusting the Zn2 +: OH-increased the proportion of different responses of different light-colored ZnO quantum dots, the temperature through a series of experiments Have a strong light and realize the controllability of the emission wavelength Liquid through a relatively simple preparation of the ZnO / CdS quantum dots to study the ZnO / CdS quantum dots the optical properties, and by adjusting the adjustable light color to achieve them, consistent with the response requirements of blue-chip LEDs, and blue composite Can get warm white, white on the market to make up for the cold white LEDs defects greatly enhance the color effect of white LEDs, the quantum dots prepared in the warm white LEDs have potential applications.To SBA-15 as the carrier of the ZnO / CdS quantum dots with high luminescence efficiency and stability and extended half-life and so on. Mesoporous materials high thermal stability, as the quantum dots to provide a more favorable microenvironment. The optical performance is improved, while good thermal stability. The correlation of the annealing temperature the green PL emission of the heterostructures products is also discussed.Keywords: zinc oxide; Mesoporous materials; quantum dots; porous microspheres; porous prisms; optical propertiesPaper type: research report...