Improving the quantum yield of ultra-small size CdSe quantum dots through Zn doping and silica coating

Chun-Ru Huang; Shu-Ru Chung

doi:10.1117/12.2529047

3 September 2019 Improving the quantum yield of ultra-small size CdSe quantum dots through Zn doping and silica coating

Chun-Ru Huang, Shu-Ru Chung

Proceedings Volume 11089, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVI; 110890G (2019) https://doi.org/10.1117/12.2529047
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

The ultra-small size of CdSe quantum dots (US-CdSe), which have both the surface state and band edge emissions, have been paid more attention owing to their unique optical properties. However, the low quantum yield (QY) and poor stability limits their application in solid-state lighting (SSL). In order to solving above problems, the US-CdSe were prepared by adding zinc element and coating with SiO₂ through the colloidal chemistry method. The result shows that the QY of US-CdSe is improved from 18 to 36 % after zinc doped due to enhance the band edge emission intensity as well as the stability also can be improved after zinc doping. Moreover, the band edge and surface state emission peaks for all samples fix at 440 and 540 nm, respectively. The US-CdSe and CdSe:Znx QDs were stored at room temperature for 5 months, and the CdSe:Zn15 has the highest QY enhancement of 5.6%/month. The luminous intensity of CdSe:Znx QDs coated with SiO₂ only decreases between 8 to 18 % depends on Zn concentrations, while the as-prepared US-CdSe decreases more than 18 % at 100 °C, meaning that the SiO₂-coating sample have excellent thermal stability and more potential for SSL application.

Conference Presentation

Citation Download Citation

Chun-Ru Huang and Shu-Ru Chung "Improving the quantum yield of ultra-small size CdSe quantum dots through Zn doping and silica coating", Proc. SPIE 11089, Nanoengineering: Fabrication, Properties, Optics, Thin Films, and Devices XVI, 110890G (3 September 2019); https://doi.org/10.1117/12.2529047

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