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Effect of surface/interfacial defect on photo-stability of thick shell CdZnSeS/ZnS quantum dots

Abstract

High color-purity CdZnSeS alloy cores and CdZnSeS/ZnS core/shell quantum dots (QDs) with 3, 11 and 17 monolayers (MLs) ZnS shell are synthesized and the narrow emission (full-width at half-maximum:~21 nm) is attributed to the high size uniformity of the QDs and the narrow linewidth of single QDs’ spectra. The ultraviolet (UV) irradiation experiments show that the photo-stabilities of the samples improve remarkably with increasing shell thickness, but the photo-stability decreases obviously instead when the shell thickness is further increased to 17 MLs. The spectro-electrochemical (SEC) measurements indicate that the exciton recombination of the QDs are mainly affected by surface electronic traps, and the interaction between exciton recombination centers and surface traps is significantly weakened with the increase of shell thickness due to a decreased wave function overlap of exciton and surface traps. In the case of 17 MLs shell, the reduced photo-stability is due to an increased interfacial defects caused by the stress release during UV illumination, which can be proved by the HRTEM and the XRD patterns data. Further, based on the QDs’ mass theory calculation, a photo-stable white LED is fabricated by encapsulating with the thick-shell QD, and an exceptional color gamut of 130% relative to National Television Systems Committee color space can be achieve. And its colorimetry and photometry are discussed in detail.

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Publication details

The article was received on 24 May 2018, accepted on 11 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR04224A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Effect of surface/interfacial defect on photo-stability of thick shell CdZnSeS/ZnS quantum dots

    B. Huang, H. Yang, L. Zhang, Y. Yuan, Y. Cui and J. Zhang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04224A

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