Journal
NANO LETTERS
Volume 21, Issue 17, Pages 7252-7260Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02284
Keywords
bulk-like quantum dots; light-emitting diodes; electroluminescence; ZnSe/ZnS; high efficiency
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Funding
- National Natural Science Foundation of China [61922028, 61874039, 11804077]
- Foundation of Westlake University
- Innovation Research Team of Science and Technology in Henan Province [20IRTSTHN020]
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By growing a thin shell of ZnS on ZnSe cores with sizes larger than the bulk Bohr diameter, blue-emitting heavy-metal free QDs with high quantum yield of 95% and extremely narrow emission width of around 9.6 nm were successfully synthesized. The bulk-like size of ZnSe cores also improves charge transport, resulting in bright pure blue emission with an external quantum efficiency of 12.2% and a relatively long operating lifetime in LEDs.
Blue-emitting heavy-metal free QDs simultaneously exhibiting photoluminescence quantum yield close to unity and narrow emission line widths are essential for next-generation electroluminescence displays, yet their synthesis is highly challenging. Herein, we develop the synthesis of blue-emitting QDs by growing a thin shell of ZnS on ZnSe cores with their size larger than bulk Bohr diameter. The bulk-like size of ZnSe cores enables the emission to locate in the blue region with a narrow emission width close to its intrinsic peak width. The obtained bulk-like ZnSe/ZnS core/shell QDs display high quantum yield of 95% and extremely narrow emission width of similar to 9.6 nm. Moreover, the bulk-like size of ZnSe cores reduces the energy level difference between QDs and adjacent layers in LEDs and improves charge transport. The LEDs fabricated with these high-quality QDs show bright pure blue emission with an external quantum efficiency of 12.2% and a relatively long operating lifetime.
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