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Research Article | Open Access | Online First

ZnSeTe/CdZnSe-based type-II core–shell quantum dots with tunable blue emission

Muhammad Ramzan1, Chenhui Wang2 (), Mingrui Liu1, Peng Huang3, Jing Li4, Yin Song3, Haizheng Zhong1 ()
MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Beijing Engineering Research Center for Mixed Reality and Advanced Display Technology, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
MIIT Key Laboratory of Complex-Field Intelligent Exploration, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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We report the synthesis of ZnSeTe/CdZnSe-based type-II core–shell quantum dots with tunable blue emission.

Abstract

Blue emissive quantum dots are key materials in emerging light-emitting technologies for display applications. Herein, we report the synthesis of ZnSeTe/CdZnSe-based type-II core–shell quantum dots with a low Cd content of less than 2.5%. By modifying the Cd content of the CdZnSe shell, photoluminescence emission can be tuned from 430 to 510 nm with a full width at half maximum of less than 26 nm. Transient absorption spectra illustrate the charge transfer between the conduction band of ZnSeTe and the conduction band of CdZnSe, as well as the recombination between the valence band of ZnSeTe and the conduction band of CdZnSe. By subsequent growth of ZnSe and ZnS shells, the resulting quantum dots achieved a photoluminescence quantum yield of 95%. We further demonstrate a blue quantum dot light-emitting diode with an emission peak at 467 nm, showing a maximum external quantum efficiency of 5%, a maximum luminance of 10,376 cd·m−2, and an extrapolated T95 lifetime of 4.7 h.

Keywords

quantum dotblue emissiontype-IIlight-emitting diodedisplay

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Nano Research
DOI: 10.26599/NR.2025.94907267
Cite this article:
Ramzan M, Wang C, Liu M, et al. ZnSeTe/CdZnSe-based type-II core–shell quantum dots with tunable blue emission. Nano Research, 2025, https://doi.org/10.26599/NR.2025.94907267
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