Excitation transfer from organic matrix to CdS nanocrystals fabricated by the Langmuir-Blodgett method
In this paper we studied the absorption, photolu-minescence and photoluminescence excitation spectra of CdS nanocrystals formed by the Langmuir-Blodgett technique. Features of the absorption and photoluminescence excitation spectra associated with optical transitions in the matrix and nanocrystals were identified. The efficiency of the transfer of electronic excitation from organic matrix to nanocrystals was studied. It is shown that the charge carriers are efficiently transferred from matrix to the levels of electron and hole and level of acceptor in nanocrystals. The large Stokes shift caused by the fine structure of exciton (light and dark exciton) wasmeasured. Theshiftvalueisintherange of 140- 220 meV for nanocrystals radius of 2.4 nm and 2.0.nm, respectively.