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Synthesis and Optical Properties of ZnO/CdS Quantum Dots for LED Application

Author: WangLiTong
Tutor: YuXiBin
School: Shanghai Normal University
Course: Applied Chemistry
Keywords: Zinc oxide CdS Quantum dots Mesoporous materials Optical performance
CLC: O614.24
Type: Master's thesis
Year: 2011
Downloads: 115
Quote: 0
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Abstract


In this paper, a relatively simple and convenient method synthesized ZnO quantum dots , ZnO / CdS quantum dot growth of ZnO / CdS quantum dots in mesoporous materials SBA-15 channels , and using fluorescence spectroscopy ( PL ) , differential thermal - TG (TG -DTA), X photoelectron spectroscopy ( XPS ) , UV - visible absorption spectroscopy (UV-Vis), transmission electron microscopy ( TEM ) , high-resolution transmission electron microscopy ( HRTEM ) , field emission scanning electron microscope (FESEM) and X- ray diffraction (XRD) were used to characterize the structure, morphology and optical properties of the resulting material , the results are as follows : ZnO quantum dots prepared by simple liquid method . The diameter of the quantum dot in of 3 ~~ nm , have a good absorbing properties within the wavelength range of 200-540 nm , and by adjusting of Zn2 : OH- reaction ratio obtained ZnO quantum dots of the different light color , through a series of temperature experiments to obtain a strong luminescence , and achieve the emission wavelength of the controllability . ZnO / CdS quantum dots prepared through simple liquid method to study the optical properties of ZnO / CdS quantum dot , and adjustable light color , in line with the Blu-ray the LEDs chip the response requirements and Blu-ray composite can be achieved by adjusting the warm white light , to make up for the defects of the current market cold white LEDs white , to greatly improve white LEDs color effect , and has potential applications in quantum dots prepared in warm white LEDs . SBA-15 as the carrier of the ZnO / CdS quantum dots have a high stability and a luminous efficiency and extending the half-life , and the like. The higher light thermal stability of the mesoporous materials , quantum dots provide a more favorable microenvironment . Improve the optical performance , good light and heat stability .

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > The zinc Vice family (Ⅱ B group metal elements )
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