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Luminescence Enhancement of CdS Quantum Dots in Glass by Ag+ Ion Exchange

Authors

  • Kai Xu,

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

    Corresponding author
    • Department of Materials Science and Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyeongbuk, South Korea
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Author to whom correspondence should be addressed. e-mail: jheo@postech.ac.kr

Abstract

Luminescence of CdS quantum dots (QDs) enhanced by the induction of Ag nanoparticles (NPs) in glasses was investigated. Ag+ ions diffused into glasses containing CdS QDs by ion exchange, then formed Ag NPs after subsequent heat treatment. Luminescence intensity of CdS QDs increased approximately three times when the ion-exchange duration was 1 min, but was severely quenched when the duration was extended to 30 min. Increasing the amount of Ag+ ions increased the number of Ag NPs and decreased the average distance between Ag NPs and CdS QDs. This decrease in the average distance induced the changes of luminescence intensity.

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