A bright future for colloidal quantum dot lasers

Geiregat, Pieter; Thourhout, Dries Van; Hens, Zeger

doi:10.1038/s41427-019-0141-y

Cited by 75 publications

(64 citation statements)

References 37 publications

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“…2 This finding initiated a widespread research effort to harness CQD materials for optical gain, which is driven by the promise of forming solution-processed gain materials with tunable optical properties. [39][40][41] Not unlike organic laser dyes or lanthanide ions, stimulated emission from CQDs involves an electronic transition between discrete states, typically the CQD LUMO and HOMO or band-edge levels (Fig. 4a).…”

Section: Colloidal Qd-stimulated Light Emissionmentioning

confidence: 99%

Electrically Pumped QD Light Emission from LEDs to Lasers

Wu¹,

Geiregat²,

Liu³

et al. 2021

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Section: Colloidal Qd-stimulated Light Emissionmentioning

confidence: 99%

Electrically Pumped QD Light Emission from LEDs to Lasers

Wu¹,

Geiregat²,

Liu³

et al. 2021

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“…Perovskite quantum dots (QDs) feature a low degeneracy of electronic states, near‐unity photoluminescence (PL) quantum yield (QY), and narrow emission linewidth, making them a promising material system for next‐generation lasers. [ 1 , 2 , 3 , 4 ] Since early reports of controlled synthesis, [ 5 ] amplified spontaneous emission (ASE), and lasing [ 1 ] in all‐inorganic cesium–lead halide quantum dots, further efforts have been devoted to achieving low lasing thresholds in longer‐lived excitation regimes. [ 6 , 7 ] Due to Auger recombination, however, the lasing threshold increases up to two orders of magnitude from short‐pulsed excitation (femtosecond) to long‐pulsed (nanosecond) excitation.…”

Section: Introductionmentioning

confidence: 99%

Quantum Dot Self‐Assembly Enables Low‐Threshold Lasing

et al. 2021

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Perovskite quantum dots (QDs) are of interest for solution-processed lasers; however, their short Auger lifetime has limited lasing operation principally to the femtosecond temporal regime the photoexcitation levels to achieve optical gain threshold are up to two orders of magnitude higher in the nanosecond regime than in the femtosecond. Here the authors report QD superlattices in which the gain medium facilitates excitonic delocalization to decrease Auger recombination and in which the macroscopic dimensions of the structures provide the optical feedback required for lasing. The authors develope a self-assembly strategy that relies on sodiumd-an assembly director that passivates the surface of the QDs and induces self-assembly to form ordered three-dimensional cubic structures. A density functional theory model that accounts for the attraction forces between QDs allows to explain self-assembly and superlattice formation. Compared to conventional organic-ligand-passivated QDs, sodium enables higher attractive forces, ultimately leading to the formation of micron-length scale structures and the optical faceting required for feedback. Simultaneously, the decreased inter-dot distance enabled by the new ligand enhances exciton delocalization among QDs, as demonstrated by the dynamically red-shifted photoluminescence. These structures function as the lasing cavity and the gain medium, enabling nanosecond-sustained lasing with a threshold of 25 μJ cm -2 .

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“…For instance, SAQD-based devices help achieve single-electron charge sensing [ 12 ], entanglement between spins and photons [ 13 , 14 ], single-photon sources [ 15 ], or single-spin [ 16 ], and help also the control of Cooper pair splitting [ 17 ], spin transport [ 18 ], spin–orbit interaction [ 19 ], g -factor [ 20 ], and Kondo effect [ 21 ]. On the other hand, SAQD technologies allow for manufacturing high density of QDs, which are crucial for implementing opto-electronic devices such as QD-based light-emitting diodes (LEDs) [ 22 ], QD-memories [ 4 , 23 ], QD-lasers [ 24 , 25 , 26 , 27 ], QD-infrared photodetectors [ 8 , 28 , 29 ], and QD-solar cells [ 30 ]. A key point in these devices is that the position of carrier level(s) can be tuned by controlling the dot size [ 2 ], and, this, by modifying the growth conditions [ 6 , 10 , 11 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Modeling Quantum Dot Systems as Random Geometric Graphs with Probability Amplitude-Based Weighted Links

Cuadra

Borge

2021

Nanomaterials

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This paper focuses on modeling a disorder ensemble of quantum dots (QDs) as a special kind of Random Geometric Graphs (RGG) with weighted links. We compute any link weight as the overlap integral (or electron probability amplitude) between the QDs (=nodes) involved. This naturally leads to a weighted adjacency matrix, a Laplacian matrix, and a time evolution operator that have meaning in Quantum Mechanics. The model prohibits the existence of long-range links (shortcuts) between distant nodes because the electron cannot tunnel between two QDs that are too far away in the array. The spatial network generated by the proposed model captures inner properties of the QD system, which cannot be deduced from the simple interactions of their isolated components. It predicts the system quantum state, its time evolution, and the emergence of quantum transport when the network becomes connected.

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A bright future for colloidal quantum dot lasers

Cited by 75 publications

References 37 publications

Electrically Pumped QD Light Emission from LEDs to Lasers

Electrically Pumped QD Light Emission from LEDs to Lasers

Quantum Dot Self‐Assembly Enables Low‐Threshold Lasing

Modeling Quantum Dot Systems as Random Geometric Graphs with Probability Amplitude-Based Weighted Links

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