(a) TEM image and (b) UV-visible absorption and fluorescence spectra of near-stoichiometric NCs. The particle size was . The fluorescence emission spectrum was obtained under excitation and the excitation spectrum was obtained at . The absorption peak is indicated by a thick arrow at around with tangent lines.
(a) XRD patterns of products 1, 4, and 7. Product 1 is stoichiometric product. (b) and (c) are TEM images of products 4 and 7.
(a) Raman spectra of products. The spectra were obtained at laser light. The peak of mode was shifted to higher frequency among products 1–4. (b) Relation between the wavenumber of peak and elemental ratio of in product. The solid line is estimated using a Matushita’s equation and the solid marks are the experimental value of the synthesized products.
(a) Absorption, (b) fluorescence emission, and (c) fluorescence excitation spectra of products. The absorption edge and fluorescence wavelength were shifted with decreasing ratio. Product 4 showed the highest luminescence intensity and the quantum yield achieved as determined through the comparison with rhodamine B.
(a) Absorption and fluorescence spectra of ZnS-coated products. The product treated for showed the higher fluorescence. The quantum yield achieved . (b) Raman spectra of ZnS-coated products. The peaks around 270 and were observed in the spectra of the ZnS-coated products.
Elemental composition and optical properties of products. Fluorescence spectra were measured under excitation. The quantum yield was determined through a comparison with rhodamine B.
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