Photoluminescence in quantum-confined SnO2 nanocrystals:: Evidence of free exciton decay

被引：268

作者：

Lee, EJH

Ribeiro, C

Giraldi, TR

Longo, E

Leite, ER

Varela, JA

机构：

[1] Univ Fed Sao Carlos, Dept Quim, Ctr Multidisciplinar Desenvolvimento Mat Ceram, Lab Interdisciplanar Electroquim & Ceram, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Estadual Paulista, Inst Quim, Ctr Multidisciplinar Desenvolvimento Mat Ceram, Lab Interdisciplanar Electroquim & Ceram, Sao Paulo, Brazil

来源：

APPLIED PHYSICS LETTERS | 2004年 / 84卷 / 10期

关键词：

D O I：

10.1063/1.1655693

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Nanocrystalline SnO2 quantum dots were synthesized at room temperature by hydrolysis reaction of SnCl2. The addition of tetrabutyl ammonium hydroxide and the use of hydrothermal treatment enabled one to obtain tin dioxide colloidal suspensions with mean particle radii ranging from 1.5 to 4.3 nm. The photoluminescent properties of the suspensions were studied. The particle size distribution was estimated by transmission electron microscopy. Assuming that the maximum intensity photon energy of the photoluminescence spectra is related to the band gap energy of the system, the size dependence of the band gap energies of the quantum-confined SnO2 particles was studied. This dependence was observed to agree very well with the weak confinement regime predicted by the effective mass model. This might be an indication that photoluminescence occurs as a result of a free exciton decay process. (C) 2004 American Institute of Physics.

引用

页码：1745 / 1747

页数：3

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