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Issue 38, 2018
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Highly bright and stable white-light-emitting cadmium-free Ag,Mn co-doped Zn–In–S/ZnS quantum dots and their electroluminescence

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Abstract

Optimized white light emitting Ag,Mn:Zn–In–S quantum dots (QDs) were synthesized via a simple, scalable, reproducible, and low-cost one-pot non-injection synthetic approach. After coating a thick ZnS shell (∼12 monolayers) on the core QDs, high photoluminescence (PL) quantum yield (QY) up to 76% was achieved and high emission efficiency was retained even when the initially oil-soluble QDs were transferred into aqueous media by ligand replacement. Moreover, both thermal stability and photostability of thick shell-Ag,Mn:Zn–In–S/ZnS QDs were significantly enhanced as compared with those of Ag,Mn:Zn–In–S core QDs due to the suppressed surface defects resulting from the passivation of the dense ZnS layers. White quantum dot light-emitting diodes (QD-LEDs) were fabricated using thick shell Ag,Mn:Zn–In–S/ZnS QDs as single QDs emitter, showing good performance with maximum current efficiency of 1.86 cd A−1 corresponding to external quantum efficiency (EQE) of 0.82% at a current density of 0.065 mA cm−2, color rendering indices (CRI) of 83, Commission International d’Eclairage (CIE) coordinates of (0.344, 0.393) and correlated color temperature (CCT) of 5156 K.

Graphical abstract: Highly bright and stable white-light-emitting cadmium-free Ag,Mn co-doped Zn–In–S/ZnS quantum dots and their electroluminescence

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Publication details

The article was received on 27 Jul 2018, accepted on 14 Aug 2018 and first published on 16 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC03742F
J. Mater. Chem. C, 2018,6, 10233-10240

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    Highly bright and stable white-light-emitting cadmium-free Ag,Mn co-doped Zn–In–S/ZnS quantum dots and their electroluminescence

    W. Zhang, C. Pan, F. Cao, H. Wang and X. Yang, J. Mater. Chem. C, 2018, 6, 10233
    DOI: 10.1039/C8TC03742F

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