Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 13, Pages 15401-15406Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c01699
Keywords
quantum dots; indium phosphide; cation exchange; lattice defects; light-emitting diodes
Funding
- National Natural Science Foundation of China [62105195, 61735004]
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Indium phosphide (InP) quantum dots (QDs) with highly luminescent InP/ZnSe/ZnS QDs were successfully synthesized by constructing Se-rich shielding layers on the surfaces of InP cores, which improved the external quantum efficiency of QLED devices at high luminance.
Indium phosphide (InP) quantum dots (QDs) have demonstrated great potential for light-emitting diode (LED) application because of their excellent optical properties and nontoxicity. However, the over performance of InP QDs still lags behind that of CdSe QDs, and one of main reasons is that the Zn traps in InP lattices can be formed through the cation exchange in the ZnSe shell growth process. Herein, we realized highly luminescent InP/ZnSe/ZnS QDs by constructing Se-rich shielding layers on the surfaces of InP cores, which simultaneously protect the InP cores from the invasion of Zn2+ into InP lattices and facilitate the ZnSe shell growth via the reaction between Zn2+ precursors and Se2- shielding layers. The as-synthesized green InP/ZnSe/ZnS QDs had a high photoluminescence quantum yield (PLQY) of up to 87%. The fabricated QLEDs present a peak external quantum efficiency of 6.2% with an improved efficiency roll-off at high luminance, which is 2 times higher than that of control devices.
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