ESR studies of semiconductor-doped glasses

Omi, S.; Hata, C.; Kasahara, Shoji; Uchida, Katsuaki; Aoki, Hiroshi; Tanji, Hiroaki; Asahara, Yoshiyuki; Ikushima, Akira J.; Tokizaki, T.; Nakamura, Arao

doi:10.1016/0022-3093(94)90276-3

Cited by 2 publications

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“…The nature of the defect states in II–VI NCs has been studied mainly by the PL spectroscopy. − Electron spin resonance (ESR) and optically detected magnetic resonance (ODMR), which probe microscopic signature of defects directly, − have rarely been applied up to now. − ,, In particular, an earlier ODMR study of large (>2 nm) CdS nanoparticles in phosphate glass revealed unusual spectra explained by signals from electron–hole pairs with a strong exchange interaction. , In our recent ODMR study of ∼5 nm CdS NCs in different polymer matrices, namely, the oxygen-containing polymer PVA (polyvinyl alcohol) and oxygen-free polymer PEI (polyethyleneimine), the differences in nanocomposite properties were correlated to different structures of the NC–polymer interfaces . ODMR studies of other quantum confined semiconductor systems (without magnetic dopants) are still very rare …”

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confidence: 99%

Size-Dependent Effects in Optically Detected Magnetic Resonance Spectra of CdS Nanocrystals

et al. 2022

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A quasi-white photoluminescence (PL) emission of colloidal CdS nanocrystals (NCs) of various sizes (2, 3, and 6 nm) embedded in a polymer matrix was examined by optically detected magnetic resonance (ODMR) spectroscopy. The registered ODMR spectra are complex, composed of both positive and negative signals. The positive component of the ODMR signal depends strongly on both particle size and the range of the PL wavelength registration. Based on this behavior it is ascribed to the complex paramagnetic centers formed by electron-and hole-trapping species coupled by an exchange interaction. By variation of the state of the NC/ polymer interface, it is shown that the electron-trapping center is located at the interface. The sharp negative component of the ODMR spectra does not depend on the NC size. It was assigned to a sulfur vacancy (V s ) acting as a center of nonradiative recombination.

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