Peculiarities of the nonlinear absorption of colloidal solutions of CdSe/ZnS quantum dots under stationary single-photon excitation of excitons

Smirnov, A. M.; Golinskaya, A. D.; Ezhova, Kseniia; Kozlova, M. V.; Манцевич, В. Н.; Днепровский, В. С.

doi:10.1134/s1063776117110127

Cited by 19 publications

(1 citation statement)

References 34 publications

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“…It is clear that the saturation value and the intensity of Cu-associated PL depend on the doping concentration of copper ions. The presence of Cu-associated PL saturation is caused by the filling effect of Cu acceptor levels and by the long radiative lifetimes of the copper states. ,− …”

Section: Resultsmentioning

confidence: 99%

Damping of Cu-Associated Photoluminescence and Formation of Induced Absorption in Heavily Cu-Doped CdSe Quantum Dots

Smirnov¹,

Golinskaya²,

Kotin³

et al. 2019

J. Phys. Chem. C

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We studied photoluminescence (PL) properties and nonlinear absorption characteristics of heavily Cu-doped CdSe colloidal quantum dots (QDs) under nanosecond laser pulse excitation. A strong dependence of basic exciton transition behavior and Cu dopant-associated PL on the concentration of copper ions and pump intensities was revealed for the first time. The saturation of the copper-associated PL signal was found to happen much faster than the saturation of nonlinear absorption. The induced absorption and saturation of high energy transitions due to the exciton−exciton interaction were investigated in Cu-doped CdSe QDs. The obtained results could be useful for the development of optoelectronic devices operating at room temperature on the basis of Cu-doped colloidal QDs.

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Section: Resultsmentioning

confidence: 99%

Damping of Cu-Associated Photoluminescence and Formation of Induced Absorption in Heavily Cu-Doped CdSe Quantum Dots

Smirnov¹,

Golinskaya²,

Kotin³

et al. 2019

J. Phys. Chem. C

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A New Generation of Liquid Lasers from Engineered Semiconductor Nanocrystals with Giant Optical Gain

Huang

Sun

et al. 2023

Laser & Photonics Reviews

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With the development of optofluidic technology, liquid lasers have attracted intense interest but still face a formidable challenge due to the lack of qualified gain media and creative device design. Compared to the organic fluorescent dyes and traditional CdSe‐based nanocrystals (NCs), the lead‐halide perovskite (LHP) NCs feature larger gain coefficient and higher robustness, which renders LHP NCs a promising unexploited liquid gain medium. Herein, for the first time, the hidden principle governing the solution‐based light amplification in LHP semiconductor NCs is demystified and it is demonstrated that the LHP NCs are superior solution‐phase gain media showing a giant (≈2600 cm−1) optical gain. On this basis, a novel microfluidic laser device is designed and realized that exhibits a record‐low pump threshold (≈22.7 µJ cm−2), high Q‐factor (≈7480), large output polarization (≈0.91), and long‐time robustness over high‐intensity operation, which is readily applicable to practical applications. The findings represent a significant step toward the technologically important liquid lasers of the new generation and can advance optofluidic applications.

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Photoluminescence and nonlinear transmission of Cu-doped CdSe quantum dots

Smirnov¹,

Golinskaya

Kotin

et al. 2019

Journal of Luminescence

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Peculiarities of the nonlinear absorption of colloidal solutions of CdSe/ZnS quantum dots under stationary single-photon excitation of excitons

Cited by 19 publications

References 34 publications

Damping of Cu-Associated Photoluminescence and Formation of Induced Absorption in Heavily Cu-Doped CdSe Quantum Dots

Damping of Cu-Associated Photoluminescence and Formation of Induced Absorption in Heavily Cu-Doped CdSe Quantum Dots

A New Generation of Liquid Lasers from Engineered Semiconductor Nanocrystals with Giant Optical Gain

Photoluminescence and nonlinear transmission of Cu-doped CdSe quantum dots

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