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Enhancement of CdSe/ZnS quantum dot-based LED by core-shell modification

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Abstract

In this study, we performed an analysis of quantum-dot-based light-emitting diodes (QD-based LEDs) to investigate the defects at the interface between the core and the shell of the quantum dots (QDs) using gradient-shell QDs (CdSe/Cd1-xZnxSe1-ySy/ZnS, G-QDs) and single-shell QDs (CdSe/ZnS, S-QDs). QDs of the general core-shell type have defects at the core and shell junction interface due to the different lattice constants. However, G-QDs have a low number of lattice defects in the form of a step function between the core and the shell owing to their chemical composition and can more easily confine electron-hole pairs (EHP). Therefore, we fabricated QD-based LEDs by using two emissive layer (G-QDs and S-QDs) and analyzed their characteristics, including their brightness and efficiency.

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Authors and Affiliations

  1. School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, 702-701, Korea

    Sang-Won Lee, Ju-Seong Kim, Jae-Sung Lee, Hyun-Min Jeong, Sai-Anand Gopalan & Shin-Won Kang

  2. Center for Functional Devices Fusion Platform, Kyungpook National University, Daegu, 702-701, Korea

    Byoung-Ho Kang

  3. Department of Biomedical Engineering, School of Medicine, Dankook University, Cheonan, 702-701, Korea

    Seung-Ha Lee

  4. Department of Electronic Engineering, Kyungil University, Gyeongsan, 712-702, Korea

    Dae-Hyuk Kwon

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  1. Sang-Won Lee
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  2. Ju-Seong Kim
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  3. Jae-Sung Lee
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  4. Hyun-Min Jeong
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  5. Sai-Anand Gopalan
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  6. Shin-Won Kang
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  7. Byoung-Ho Kang
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  8. Seung-Ha Lee
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  9. Dae-Hyuk Kwon
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Corresponding author

Correspondence to Shin-Won Kang.

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*These authors contributed equally to this work.

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Lee, SW., Kim, JS., Lee, JS. et al. Enhancement of CdSe/ZnS quantum dot-based LED by core-shell modification. Journal of the Korean Physical Society 66, 82–86 (2015). https://doi.org/10.3938/jkps.66.82

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  • DOI: https://doi.org/10.3938/jkps.66.82

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