Abstract
Titanium monoxide (TiO) was added to host glass, which was heat-treated at 520 °C for 10 h to incorporate Ti2+ into PbSe quantum dots (QDs) to control their band gaps. Incorporation of Ti2+ ions into PbSe QDs was confirmed using electron energy loss spectroscopy analysis. Addition of TiO caused blue-shift of the absorption and photoluminescence (PL) bands of the QDs. Absorption bands moved from 1621 nm at TiO concentration [TiO] = 0.0% to 1418 nm at [TiO] = 0.4 mol%. Average diameters of QDs remained mostly unaffected (i.e., 6.25 ± 0.14 nm at [TiO] = 0.0% to 6.03 ± 0.1 nm at [TiO] = 0.4 mol%). The changes in absorption and PL bands originated from the incorporation of Ti2+ ions into PbSe QDs. Band gaps of PbSe QDs increased from 0.76 eV at [TiO] = 0% to 0.88 eV at [TiO] = 0.4 mol%. This simple method to tune the band gap of PbSe QDs has possible applications in optical communication fiber amplifiers, infrared laser sources and saturable absorbers.
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This research is supported by Basic Science Research Program (NRF-2014R1A1A2002789) and the Priority Research Center (NRF-2009-0094036) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning.
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Tesfamariam, B.B., Wang, J., Liu, C. et al. Tuning the band gap of PbSe quantum dots in glasses by TiO doping. J Mater Sci: Mater Electron 28, 7013–7017 (2017). https://doi.org/10.1007/s10854-016-6023-y
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DOI: https://doi.org/10.1007/s10854-016-6023-y