Bright CdSe/CdS Quantum Dot Light-Emitting Diodes with Modulated Carrier Dynamics via the Local Kirchhoff Law

Abstract

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 plasmon-induced 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/m2) 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.

Plasmon‐Assisted Directional Infrared Photoluminescence of HgTe Nanocrystals

“…This behavior is expected according to standard textbook theory because non-radiative transfers dominate the interactions when emitters are placed at vanishing distance to metals, ultimately resulting in Joule losses in such optically lossy materials. [48,50] This result contrasts with what has been observed for other quantum dots, such as PbS [36,37] and CdSe/CdS, [51] for which an enhancement of the PL for thin films has been observed in similar systems (NCs coupled with metallic resonators, metallic mirrors).…”

Probing Morphology-Dependent CdS/MoS2 Heterostructures for Photocatalytic and Light-Sensing Applications

“…Semiconductors based on transition-metal compounds have been studied for their various transport, optical, and mechanical properties. − TMDs such as MoS 2 , possessing excellent layer-dependent electronic properties, good thermal stability, and abundant availability, are suitable as cocatalysts for CdS nanostructures in photocatalytic hydrogen generation. Lian et al predicted that the building potential of 0.45 eV produced at the CdS/MoS 2 heterojunction could enhance charge separation and be suitable for hydrogen production .…”

Type-I CdSe@CdS@ZnS Heterostructured Nanocrystals with Long Fluorescence Lifetime

“…Cadmium selenide (CdSe) quantum dots (QDs) have been studied extensively because of their quantum size effects and because their luminous wavelength can be extended to the entire visible region. QDs can be synthesized via surface modification of organic molecules not only to improve their luminescent properties and stability but also to obtain a narrow size distribution [15]. However, the presence of many dangling bonds on the surface of the material may lead to defects, which can greatly reduce the stability and luminescent properties of the material [16].…”