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Fabrication, Defect Manipulation and Optical Properties of ZnO Hybrid Materials

Author: YangLiZuo
Tutor: WangXueFeng
School: Suzhou University
Course: Condensed Matter Physics
Keywords: ZnO Hybrid materials Defect manipulation Up-conversion luminescence
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 14
Quote: 0
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Abstract


Recently, hybrid materials have attracted considerable and interdisciplinary attention and enthusiasm all over the world due mainly to their multifunction that originates from the advantages of different components. Glass materials generally possess high transparency, good formability, and tunable chemical compositional range; while semiconductors have excellent optical and electrical properties. When combining ZnO semiconducting nanocrystals and oxide glassy materials, it is expected that such a hybrid material will have extraordinary and novel functions.In this thesis, we fabricated undoped and rare-earth-ion-doped ZnO hybrid materials （i.e., ZnO glass ceramics） by the conventional melt-quench and post processing techniques.We studied the effects of the annealing temperatures and atmospheres on the photoluminescence properties of ZnO glass hybrid materials. Firstly, the defect concentrations and the corresponding emissions were manipulated upon the different annealing temperatures. Secondly, the defects like zinc vacancies and oxygen vacancies, which are related to the green emission in the photoluminescence, were manipulated upon the different annealing atmospheres. Finally, with the assistance of Raman spectra, we discussed the origins of green emissions in ZnO and proposed the corresponding energy transition mechanism and depicted the defect energy diagram of ZnO.We report the successful fabrication of (Er3+, Yb3+)-co-doped ZnO transparent hybrid materials. It possesses a strong UV absorption, significant luminescence at the ZnO bandgap energy, and an intense UC emission in the visible region through a two-photon process.

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