Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 47, Pages 56476-56484Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c17152
Keywords
quantum dots; nanoantennas; plasmon; carrier dynamics; light-emitting diodes
Funding
- NSFC [52011530432, 51911530212, 51902263]
- Natural Science Foundation of Shaanxi Province [2020JQ-158]
- Fundamental Research Funds for the Central Universities [3102019JC005, 3102019ghxm004, GK202001009]
- Department of Science AMP
- Technology of Shaanxi Province [2020GXLH-Z-018]
- Northwestern Polytechnical University [2020GXLH-Z-018]
- 1000 Youth Talent Program of China
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Addressing the interactions between optical antennas and ensembles of emitters is challenging due to the complicating factors of charge transfer and Coulomb interactions. The study demonstrates how Au antennas enhance the luminescence of CdSe/CdS quantum dot assemblies through carrier dynamics control and plasmon-induced hot electron transfer. The research also shows that the localized surface plasmon resonances of Au antennas help tilt the balance between nonradiative Auger processes and radiative recombination in the CdSe core, leading to a high bright deep-red quantum dot light-emitting diode.
Addressing the interactions between optical antennas and ensembles of emitters is particularly challenging. Charge transfer and Coulomb interactions complicate the understanding of the carrier dynamics coupled by antennas. Here, we show how Au antennas enhance the luminescence of CdSe/CdS quantum dot assemblies through carrier dynamics control within the framework of the local Kirchhoff law. The Au antennas inject hot electrons into quantum dot assemblies via plasmoninduced hot electron transfer that increases the carrier concentration. Also, the localized surface plasmon resonances of Au antennas favorably tilt the balance between nonradiative Auger processes and radiative recombination in the CdSe core. Eventually, a high bright (125,091.6 cd/m(2)) deep-red quantum dot light-emitting diode is obtained by combining with Au antennas. Our findings suggest a new understanding of light emission of assembled emitters coupled by antennas, which is of essential interest for the description of light-matter interaction in advanced optoelectronics.
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