頁籤選單縮合
題 名 | Size Effect on the Photoluminescence Shift in Wide Band-Gap Material: A Case Study of SiO[feaf]-Nanoparticles |
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作 者 | Chen,Yit-tsong; | 書刊名 | 淡江理工學刊 |
卷 期 | 5:2 2002.06[民91.06] |
頁 次 | 頁99-106 |
分類號 | 440.33 |
關鍵詞 | Size effect; Photoluminescence; SiO[feaf] nanoparticles; |
語 文 | 英文(English) |
英文摘要 | In this article, I will discuss the optical properties of SiO2-nanoparticles that we have investigated recently by photoluminescence (PL) spectroscopy. In particular, I will show the blue-shifts of PL, originating from the electron-hole recombination of the self-trapped exciton (STE), observed in smaller-sized SiO2-nanoparticles. To explain the size effect in relating to the STE PL shift, a question has been raised on whether it is appropriate to apply the quantum confinement (QC) theory usually used for the Mott-Wannier type excitons in semiconductors to wide band-gap material, such as silica. In this study, a laser-heating model of free excitons (FEs) to activate lattice phonons has been developed, rather than the QC effect, to interpret the blue-shifts of STE PL in smaller-sized SiO2-nanoparticles. The blue-shift of STE PL is actually resulted from phonon-assisted PL due to the thermalization of the SiO2-nanoparticle system during laser irradiation. |
本系統中英文摘要資訊取自各篇刊載內容。