Synthesis and properties of PbSexS1-x alloyed nanocrystals

Ariel Kigel; Maya Brumer; Lilac Amirav; Aldona Sashchiuk; Efrat Lifshitz

doi:10.1117/12.726402

25 January 2007 Synthesis and properties of PbSe_xS_1-x alloyed nanocrystals

Ariel Kigel, Maya Brumer, Lilac Amirav, Aldona Sashchiuk, Efrat Lifshitz

Proceedings Volume 6596, Advanced Optical Materials, Technologies, and Devices; 65960H (2007) https://doi.org/10.1117/12.726402
Event: Advanced Optical Materials, Technologies, and Devices, 2006, Vilnius, Lithuania

Abstract

We present a comparative study of colloidal PbSe_xS_1-x alloyed nanocrystals (NCs) with variation of chemical composition and different structure (core-shell and homogeneous) prepared by a single-injection procedure with respect to corresponding PbSe core NCs and PbSe/PbS core-shell NCs prepared by the traditional two-injection procedure. The narrow band edge of absorption and photoluminescence 1S-exciton energy of PbSe_xS_1-x alloyed NCs were tuned (blue shifted) from the band edge of the same size PbSe NCs to the band edge of PbS NCs by controlling the Se+S/Pb molar ratio in the synthetic mixture. The magnitude of the Stokes shift was found to be dependent upon the size of NCs and on the core(shell) chemical composition. The largest Stokes shift (100 meV) was observed in the smaller PbSe NCs, while PbSe_xS_1-x core-alloyed shell NCs prepared by a single-injection procedure show the vanishing small Stokes shift.

Citation Download Citation

Ariel Kigel, Maya Brumer, Lilac Amirav, Aldona Sashchiuk, and Efrat Lifshitz "Synthesis and properties of PbSe_xS_1-x alloyed nanocrystals", Proc. SPIE 6596, Advanced Optical Materials, Technologies, and Devices, 65960H (25 January 2007); https://doi.org/10.1117/12.726402

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