期刊
JOURNAL OF LUMINESCENCE
卷 130, 期 1, 页码 18-23出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2009.07.010
关键词
Semiconductors; Quantum dots; Early-stage clusters; Polymer
类别
资金
- Department of Science and Technology, (Govt. of India) [SR/S1/PC-17/2006]
CdSe quantum dots (QDs) prepared using an aqueous sodium selenosulphite and N,N'-dimethylformamide (DMF) in commercial polymethylmethacrylate (PMMA) showed excellent optical properties. Tuning of the absorption and emission wavelengths by varying the selenium concentration with respect to cadmium is studied. As-prepared CdSe quantum dots showed absorption band at 405 nm (3.06 eV) associated with the formation of 'early-stage' CdSe nano-particles along with weak absorption at 480-90 nm due to continuous growth of the particles. The blue-green and yellow-green light emissions were observed from as-prepared solutions. Photoluminescence (PL) measurement showed band-edge emissions at around 430 nm for small clusters but a more stable emission at 544 nm for the 11:11 CdSe sample. X-ray diffraction (XRD) pattern of the CdSe/PMMA powder with Cd/Se ratio of 1:1 showed broad pattern for cubic CdSe. Transmission electron microscopy (TEM) showed cube like de-shaped spherical dots in the region of about 5 nm. (C) 2009 Elsevier B.V. All rights reserved.
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