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Tuning the band gap of PbSe quantum dots in glasses by TiO doping

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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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Acknowledgements

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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Authors and Affiliations

  1. Department of Materials Science and Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, 37673, South Korea

    Belay Brehane Tesfamariam & Jong Heo

  2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, Hubei, China

    Jing Wang & Chao Liu

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  1. Belay Brehane Tesfamariam
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  2. Jing Wang
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  3. Chao Liu
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  4. Jong Heo
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Correspondence to Jong Heo.

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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

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