TY - JOUR
T1 - Optical properties of CdSe nanoparticle films prepared by chemical deposition and sol-gel methods
AU - Lifshitz, E.
AU - Dag, I.
AU - Litvin, I.
AU - Hodes, G.
AU - Gorer, S.
AU - Reisfeld, R.
AU - Zelner, M.
AU - Minti, H.
PY - 1998/5/22
Y1 - 1998/5/22
N2 - CdSe nanoparticle films were prepared by chemical solution deposition and formation in a silica sol-gel matrix. X-ray powder diffraction and transmission electron microscope measurements confirmed a cubic crystallographic structure of the nanoparticles, with mean diameter varying from 4 to 20 nm. The absorption and photoluminescence spectra of the smaller crystals were strongly blue-shifted due to size quantization. This Letter focuses on the study of a non-excitonic emission band, which can be associated with surface states. The results indicate that this band involves the recombination between shallow trapped electrons and deep trapped holes, with a donor-acceptor-like recombination and are analyzed in terms of the configuration coordinate model. The CdSe nanoparticles prepared by the two different methods showed essentially the same optical behavior.
AB - CdSe nanoparticle films were prepared by chemical solution deposition and formation in a silica sol-gel matrix. X-ray powder diffraction and transmission electron microscope measurements confirmed a cubic crystallographic structure of the nanoparticles, with mean diameter varying from 4 to 20 nm. The absorption and photoluminescence spectra of the smaller crystals were strongly blue-shifted due to size quantization. This Letter focuses on the study of a non-excitonic emission band, which can be associated with surface states. The results indicate that this band involves the recombination between shallow trapped electrons and deep trapped holes, with a donor-acceptor-like recombination and are analyzed in terms of the configuration coordinate model. The CdSe nanoparticles prepared by the two different methods showed essentially the same optical behavior.
UR - http://www.scopus.com/inward/record.url?scp=0032557296&partnerID=8YFLogxK
U2 - 10.1016/S0009-2614(98)00283-8
DO - 10.1016/S0009-2614(98)00283-8
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AN - SCOPUS:0032557296
SN - 0009-2614
VL - 288
SP - 188
EP - 196
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 2-4
ER -