Abstract
Tb-doped ZnS (ZnS:Tb3+) QDs with various Tb concentration have been successfully fabricated by the wet chemical method. The X-ray diffraction (XRD) and transmission electron microscopy have revealed that the synthesized QDs had a zinc blende structure and the particle diameter was about 5 nm. The optical properties were studied through photoluminescence (PL) spectra and time decay curves. XRD, emission spectra and PL decay kinetics have confirmed the successful incorporation of Tb3+ ions into ZnS host. The PL spectra also revealed that the intensity of dopant emission was significantly enhanced due to the energy transfer from the emission of host material. The interaction mechanism and the energy transfer between Tb3+ ions were studied by Inokuti-Hirayama model. The efficiency of the energy transfer process from ZnS host to Tb3+ ions and the nature of this interaction mechanism were determined. For the first time, the quantum cutting process based on energy transfer between Tb3+ ions has also been studied for ZnS:Tb3+ QDs.
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