The role of surface and deep-level defects on the emission of tin oxide quantum dots

被引：119
作者：
Kumar, Vinod [1 ]
Kumar, Vijay [1 ]
Som, S. [1 ]
Neethling, J. H. [2 ,3 ]
Olivier, Ezra [2 ,3 ]
Ntwaeaborwa, O. M. [1 ]
Swart, H. C. [1 ]
机构：
[1] Univ Orange Free State, Dept Phys, ZA-9300 Bloemfontein, South Africa
[2] Nelson Mandela Metropolitan Univ, Dept Phys, ZA-6031 Port Elizabeth, South Africa
[3] Nelson Mandela Metropolitan Univ, Ctr HRTEM, ZA-6031 Port Elizabeth, South Africa
来源：
NANOTECHNOLOGY | 2014年 / 25卷 / 13期
基金：
新加坡国家研究基金会;
关键词：
SnO2 quantum dot; blue emission; surface defect and deep-level defect; LUMINESCENCE PROPERTIES; SNO2; NANOCRYSTALS; THIN-FILMS; PHOTOLUMINESCENCE; NANORODS;
D O I：
10.1088/0957-4484/25/13/135701
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This paper reports on the role of surface and deep-level defects on the blue emission of tin oxide quantum dots (SnO2 QDs) synthesized by the solution-combustion method at different combustion temperatures. X-ray diffraction studies showed the formation of a single rutile SnO2 phase with a tetragonal lattice structure. High resolution transmission electron microscopy studies revealed an increase in the average dot size from 2.2 to 3.6 nm with an increase of the combustion temperature from 350 to 550 degrees C. A decrease in the band gap value from 3.37 to 2.76 eV was observed with the increase in dot size due to the quantum confinement effect. The photoluminescence emission was measured for excitation at 325 nm and it showed a broad blue emission band for all the combustion temperatures studied. This was due to the creation of various oxygen and tin vacancies/defects as confirmed by x-ray photoelectron spectroscopy data. The origin of the blue emission in the SnO2 QDs is discussed with the help of an energy band diagram.
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页数：9
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