Electroluminescence of Colloidal Quantum Dots in Electrical Contact with Metallic Nanoparticles

Wang, Hongyue; Le‐Van, Quynh; Aassime, Abdelhanin; Roux, Xavier Le; Charra, Fabrice; Chauvin, Nicolas; Degiron, Aloyse

doi:10.1002/adom.201700658

Cited by 12 publications

(12 citation statements)

References 37 publications

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“…These results point to further developments in the future. For example, the dispersion with the wavelength could be alleviated or constrained by replacing the binary holograms with more elaborated patterns, such as active metasurfaces exploiting the local Kirchhoff law, as the latter makes it possible to tune the color, polarization state and brightness of the luminescence at a subwavelength scale [33,34]. In addition, this study on vector vortex beams shows a path forward to generate other complex beams out of quantum emitters.…”

Section: Discussionmentioning

confidence: 98%

Spontaneous Emission of Vector Vortex Beams

et al. 2020

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Harnessing the spontaneous emission of incoherent quantum emitters is one of the hallmarks of nano-optics. Yet, an enduring challenge remains-making them emit vector beams, which are complex forms of light associated with fruitful developments in fluorescence imaging, optical trapping and high-speed telecommunications. Vector beams are characterized by spatially varying polarization states whose construction requires coherence properties that are typically possessed by lasers-but not by photons produced by spontaneous emission. Here, we show a route to weave the spontaneous emission of an ensemble of colloidal quantum dots into vector beams. To this end, we use holographic nanostructures that impart the necessary spatial coherence, polarization and topological properties to the light originating from the emitters. We focus our demonstration on vector vortex beams, which are chiral vector beams carrying non-zero orbital angular momentum, and argue that our approach can be extended to other forms of vectorial light.

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Section: Discussionmentioning

confidence: 98%

Spontaneous Emission of Vector Vortex Beams

et al. 2020

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“…Optical antennas exhibit unique localized surface plasmon resonances (LSPR) that are characterized by confined electromagnetic field enhancement in nanoscale volumes. The investigation of antennas and how they can interact with matter has led to a variety of potential applications, such as light emission enhancement, − surface-enhanced Raman spectroscopy, − plasmon induced catalysis, − and hot electron photodetection. , In addition, CdSe quantum dot (QD)-based light-emitting diodes (QLEDs) that have been under intense investigation achieve an external quantum efficiency (EQE) around 20%. − Thus, antenna-integrated QLEDs could show potential for LSPR-enhanced and LSPR-modulated electroluminescence (EL) by combining their advantages, such as narrow linewidth, light field manipulation, and solution-processed fabrication, ,, for nano-optics. − …”

Section: Introductionmentioning

confidence: 99%

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

Wang

Guo

Hao

et al. 2021

ACS Appl. Mater. Interfaces

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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.

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“…2D materials such as graphene that have excellent carrier mobility can be integrated with bulk material via transfer technologies . 0D materials such as IV–VI group quantum dots show excellent light harvesting capability in the infrared region and can be conveniently integrated with silicon substrates via a solution process . Recently, hybrid graphene‐CQD phototransistors which combine the high mobility of graphene and strongly light‐absorbing absorbance of CQDs have been explored for enhancing both the photo‐responsivity and the gain of the photodetector and the detected wavelength can extend into the shortwave infrared (SWIR) region (≈1550 nm) .…”

Section: Introductionmentioning

confidence: 99%

Ambipolar Graphene–Quantum Dot Phototransistors with CMOS Compatibility

Zheng

Zhou

Ning

et al. 2018

Advanced Optical Materials

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The hybridization of 2D materials and colloidal quantum dots (CQDs) has been demonstrated to be an ideal platform for infrared photodetectors due to the high mobility of 2D materials and the excellent light harvesting capability of CQDs. However, the realization of ambipolar, broadband, and room‐temperature graphene–quantum dot phototransistors with complementary metal–oxide–semiconductor (CMOS) compatibility remains challenging. Here N, S codecorated graphene is deposited with PbS CQDs to fabricate a hybrid phototransistor on a silicon dioxide/silicon gate. The resulting device demonstrates a gate‐tuneable ambipolar feature with a low gate bias of less than 3.3 V at room temperature in ambient. Broadband spectra from visible to near‐infrared and to short wave infrared (SWIR) light can be detected with gain value of up to 105 and a fast response of 3 ms. Upon illumination by SWIR light at 1550 nm, the phototransistor exhibits an ultrahigh responsivity that is on the order of 104 AW−1 and a specific detectivity that is on the order of 1012 Jones with a low driving voltage of 1 V. This decorated hybrid architecture illustrates the potential of graphene and CQDs to be integrated with silicon integrated circuits and opens a new path toward ambipolar photodetector fabrication.

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Electroluminescence of Colloidal Quantum Dots in Electrical Contact with Metallic Nanoparticles

Cited by 12 publications

References 37 publications

Spontaneous Emission of Vector Vortex Beams

Spontaneous Emission of Vector Vortex Beams

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

Ambipolar Graphene–Quantum Dot Phototransistors with CMOS Compatibility

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