Stable and Low‐Threshold Optical Gain in CdSe/CdS Quantum Dots: An All‐Colloidal Frequency Up‐Converted Laser

Güzeltürk, Burak; Keleştemur, Yusuf; Gungor, Kivanc; Yeltik, Aydan; Akgül, Mehmet Zafer; Wang, Yue; Chen, Rui; Dang, Cuong; Sun, Handong; Demir, Hilmi Volkan

doi:10.1002/adma.201500418

Cited by 98 publications

(115 citation statements)

References 42 publications

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“…Olutas et al exploited the high absorption efficiency (TPA cross section ∼10 6 GM) of CdSe/CdS to obtain stimulated emission TPA threshold of 6 mJ/cm 2 (fs excitation) [47]. A slightly smaller threshold (5 mJ/cm 2 ) was demonstrated by Guzelturk et al by using CdSe NPs capped with a crown CdS shell [39].…”

Section: -P9mentioning

confidence: 99%

“…Another proposal was carried out by Guzelturk et al who presented a tailored CdS shell slowly grown on a CdSe core at high temperature [39]. Since the shell was relatively thin (6 monolayers), reduction of non radiative losses was achieved not only by delocalization of carriers but also by a decrease of traps provided by this particular smooth shell.…”

Section: Reduction Of Auger Recombination Ratementioning

confidence: 99%

“…The VCSEL was constructed with a periodic stack of SiO 2 and TiO 2 layers. Later same authors incorporated a layer of CdSe/CdS QDs in the SiO 2 /TiO 2 structure to demonstrate a high quality factor laser (FWHM < 1.5 nm), and a threshold as low as 750 μJ/cm 2 optically pumped at 800 nm (TPA mechanism) [39]. In both cases, structures were excited under femtosecond pulses.…”

Section: -P11mentioning

confidence: 99%

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Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Suárez¹

2016

Eur. Phys. J. Appl. Phys.

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Abstract. Semiconductor nanocrystals have arisen as outstanding materials to develop a new generation of optoelectronic devices. Their fabrication under simple and low cost colloidal chemistry methods results in cheap nanostructures able to provide a wide range of optical functionalities. Their attractive optical properties include a high absorption cross section below the band gap, a high quantum yield emission at room temperature, or the capability of tuning the band-gap with the size or the base material. In addition, their solution process nature enables an easy integration on several substrates and photonic structures. As a consequence, these nanoparticles have been extensively proposed to develop several photonic applications, such as detection of light, optical gain, generation of light or sensing. This manuscript reviews the great effort undertaken by the scientific community to construct active photonic devices based on these nanoparticles. The conditions to demonstrate stimulated emission are carefully studied by comparing the dependence of the optical properties of the nanocrystals with their size, shape and composition. In addition, this paper describes the design of different photonic architectures (waveguides and cavities) to enhance the generation of photoluminescence, and hence to reduce the threshold of optical gain. Finally, semiconductor nanocrystals are compared to organometallic halide perovskites, as this novel material has emerged as an alternative to colloidal nanoparticles.

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Section: -P9mentioning

confidence: 99%

Section: Reduction Of Auger Recombination Ratementioning

confidence: 99%

Section: -P11mentioning

confidence: 99%

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Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Suárez¹

2016

Eur. Phys. J. Appl. Phys.

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“…On the subject of Cd 1-x Zn x S quantum dots (QDs), their technological potentialities have been demonstrated. In this context, we can cite red-light-emitting diodes (LEDs) fabricated using CdSe/Cd 1-x Zn x S quantum dots (QDs) [11], blue liquid laser with an ultralow threshold achieved by engineering unconventional ternary CdZnS/ZnS alloyed-core/shell QDs [12], fluorescent CdS QDs used for the direct detection of fusion proteins [13] and most promising materials in solar cell fabrication [14]. Our actual challenge is to use Cd 1−x Zn x S QDs grown on nominal and vicinal Si surfaces [15][16][17] in order to obtain reliable structures for novel nanotechnological applications such as nanomemories, nanolasers and nanodevices.…”

Section: Introductionmentioning

confidence: 99%

The Energy Levels Splitting Calculated for Electrons in a Double Cd<sub>1-X</sub>Zn<sub>x</sub>s Quantum Dot

Khéfacha¹,

Safta²,

Dachraoui³

2017

JAN

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Abstract. The present work is aimed to investigate theoretically the electronic properties of a double Cd 1-x Zn x S quantum dot embedded in an insulating material. The quantum dots are assumed to have a flattened cylindrical geometry with a finite barrier at the boundary. This system is studied using the tight binding approximation. The energy levels splitting has been computed, for the electrons, versus the Zn composition and the inter-quantum dot separation as well. An analysis of the results shows that the Zn compositions x = 0.4 and x = 0.6 are appropriate to ensure the best coupling for conduction electrons.

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“…This energy band engineering allowed for improving the three-photon absorption cross section as well as suppression of Auger recombination and threephoton-induced random lasing was successfully demonstrated for the first time. In 2015, vertical-cavity surface emitting lasers employing only colloidal nanoparticles were demonstrated by Guzelturk et al [107] In this cited work, multiple layers of titania and silica nanoparticles were spun to obtain a DBR that will provide the feedback for laser action. The gain medium in this work consisted of relatively small-sized CdSe/CdS core/shell QDs, which exhibit high photoluminescence quantum efficiencies.…”

Section: Lasers Of Colloidal Materialsmentioning

confidence: 99%

Colloidal nanocrystals for quality lighting and displays: milestones and recent developments

Erdem

Demir

2016

Nanophotonics

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Recent advances in colloidal synthesis of nanocrystals have enabled high-quality high-efficiency light-emitting diodes, displays with significantly broader color gamut, and optically-pumped lasers spanning the whole visible regime. Here we review these colloidal platforms covering the milestone studies together with recent developments. In the review, we focus on the devices made of colloidal quantum dots (nanocrystals), colloidal quantum rods (nanorods), and colloidal quantum wells (nanoplatelets) as well as those of solution processed perovskites and phosphor nanocrystals. The review starts with an introduction to colloidal nanocrystal photonics emphasizing the importance of colloidal materials for light-emitting devices. Subsequently, we continue with the summary of important reports on light-emitting diodes, in which colloids are used as the color converters and then as the emissive layers in electroluminescent devices. Also, we review the developments in color enrichment and electroluminescent displays. Next, we present a summary of important reports on the lasing of colloidal semiconductors. Finally, we summarize and conclude the review presenting a future outlook.

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Stable and Low‐Threshold Optical Gain in CdSe/CdS Quantum Dots: An All‐Colloidal Frequency Up‐Converted Laser

Abstract: An all-solution processed and all-colloidal laser is demonstrated using tailored CdSe/CdS core/shell quantum dots, which exhibit highly stable and low-threshold optical gain owing to substantially suppressed non-radiative Auger recombination.

Cited by 98 publications

References 42 publications

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

The Energy Levels Splitting Calculated for Electrons in a Double Cd<sub>1-X</sub>Zn<sub>x</sub>s Quantum Dot

Colloidal nanocrystals for quality lighting and displays: milestones and recent developments

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