Photoacoustic and Photoluminescence Spectra of ZnS:Mn Nanocrystals

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The optical absorption spectra of ZnS:Mn nanocrystals can be obtained by applying photoacoustic (PA) spectroscopy, which is a powerful technique for detecting small amounts of highly scattered materials. The peak position in PA difference spectra increases linearly within experimental accuracy with the decrease of Mn^<2+> ion concentration. These results correspond to the following possibilities, (1) the increase of the higher excited energy states relative to the ground state of ^6<A>_1, (2) the increase of state density for the higher excited states and (3) the increase of transition probability from the ^6<A>_1 state to the higher excited states. These possibilities suggest the hybridization of the s-p states of the ZnS nanocrystal host and the d state of the Mn^<2+> ion impurity. The peak position of the PL spectrum (the transition from ^4<T>_1 to ^6<A>_1 states) is 〜 2.08eV with a half width of 0.24eV, similar to that of the bulk ZnS:Mn and it is independent of the Mn^<2+> ion concentration. This result might be attributed, to the fact that the Mn^<2+> emission is due to phonon assisted transition. Hence, there might be a slight shift of the peak position with increase of Mn^<2+> ion concentration due to hybridization of the s-p states of the ZnS nanocrystal host and the d state of the Mn^<2+> ion impurity. The peak intensity of the PL spectrum shows a maximum at a certain value of Mn^<2+> ion concentration and it decreases with the increase of concentration of Mn^<2+> ion impurities (concentration quenching). [DOI: 10.1143/JJAP.41.3383]
社団法人応用物理学会の論文
2002-05-30

Photoacoustic and Photoluminescence Spectra of ZnS:Mn Nanocrystals

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