Issue 38, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
27 Qad 2018
Accepted
14 Leq 2018
First published
16 Leq 2018

J. Mater. Chem. C, 2018,6, 10233-10240

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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