Optical nonlinearities of glass doped with PbS nanocrystals

Тамулайтис, Г.; Gulbinas, Vidmantas; Kodis, Gerdenis; Dementjev, Andrej; Valkūnas, Leonas; Motchalov, I.; Raaben, H.

doi:10.1063/1.373639

Cited by 45 publications

(35 citation statements)

References 23 publications

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“…14 leads to the shortening of time constant 1 with the increasing of the pump intensity, which could barely be explained.) In contrast, the time constant 13 demonstrates the remarkable shortening with the increasing of the pump light intensity [ Fig. 6(c), solid squares; and Table 1].…”

Section: ͑5͒mentioning

confidence: 99%

“…This shortening may be explained as a consequence of stronger interaction of the electron and hole wave functions with the matrix surrounding the smaller dots, which is a result of the extremely high carrier confinement in PbS QDs of such sizes. The value of the characteristic time 13 also becomes shorter for the smaller dots if one compares the values for the same pump intensity (e.g., I p = 0.9 GW/ cm 2 in Fig. 7, solid squares).…”

Section: Quantum-dot Size-dependent Bleaching Relaxationmentioning

confidence: 99%

“…To explain the emergence of the second (slow) bleaching relaxation component, we postulated the carriers' (electrons and-or holes) trapping to the deep defect (surface) states with rather long (nanosecond) live time. 13 The change in excitation intensity leads to the variation of the values of f and A f / A s . The appropriate data are collected in Table 1.…”

Section: B Transient Bleaching Datamentioning

confidence: 99%

“…A transient bleaching of the first excitonic absorption band in PbS-QD-doped glasses was exploited to Q switch and mode lock a number of solid-state lasers emitting within the 1.06-1.55 m spectral region. [4][5][6][7][8][9][10][11] It has been shown previously that the bleaching relaxation within the range of the first excitonic resonance for PbS QDs demonstrates double-exponential type, 5,7,[12][13][14] and the bleaching relaxation time depends on pump-light intensity. 5,12,14 For PbS QDs of 5.4 nm in diameter the shortening of the fast relaxation time from 17 to 5 ps with an increase in the 120-fs pump fluence from 0.5 to 4 mJ/ cm 2 was reported.…”

Section: Introductionmentioning

confidence: 99%

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Intensity-dependent bleaching relaxation in lead salt quantum dots

et al. 2005

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Bleaching relaxation in lead salt (PbS) quantum dots (QDs) of various sizes and under different pump intensities has been studied. The observed bleaching relaxation features (particularly, shortening of the bleaching relaxation times with a decrease in the QD size and an increase of the pump-light intensity) are explained in the context of the proposed spectroscopic model. The model takes into account transitions of the excited-charge carriers both within the system of quantum-confined energy levels and the defect states of the QDs. The characteristic times of the direct electron-hole recombination, carriers trapping to the defect states, and their subsequent relaxation from these states as well as the cross sections of the ground-state and excited-state absorption of charge carriers can be evaluated from the experimental data for PbS QDs of different sizes and under different pumping conditions using this model.

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Section: ͑5͒mentioning

confidence: 99%

Section: Quantum-dot Size-dependent Bleaching Relaxationmentioning

confidence: 99%

Section: B Transient Bleaching Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Intensity-dependent bleaching relaxation in lead salt quantum dots

et al. 2005

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“…Nanometer-sized semiconductor nanocrystals (NC) exhibiting a large and fast recovering optical nonlinearity have been studied extensively as candidate materials for photonics applications and optical signal processing [1,2]. Compared with well known CdS or CdSe semiconductor quantum dots, NC of PbS and PbSe are more attractive because of their larger exciton Bohr radius (46 nm for PbSe and 18 nm for PbS).…”

Section: Introductionmentioning

confidence: 99%

Optical Nonlinearities in PbSe Nanocrystals

Aleksejenko¹,

Pačebutas²,

Krotkus³

2005

Acta Phys. Pol. A

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Semiconductor Quantum Dots‐Embedded Inorganic Glasses: Fabrication, Luminescent Properties, and Potential Applications

Xia

Luo

Chao

et al. 2019

Advanced Optical Materials

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of the glass, which can provide a stable environment for QDs. Besides, some new glasses, such as phosphate, germanate, and gallate glasses, are made by replacing Si by P, Ge, and Ga at a slight expense of stability for better transmittance at specific wavelength. Embedding QDs into inorganic glass can secure chemical stability, thermal stability, and mechanical stability, thus providing access to device manufacturing and endurable operation. [15][16][17][18] So far, IIB-VIA, IVB-VIA, and halide perovskite QDs have been successfully incorporated into glass by conventional melt-quenching and subsequent heat-treatment method and their optical properties have been extensively investigated. [18][19][20] Taking advantage of the stability, the applications of QDs-embedded glasses on nonlinear optical devices, [21,22] emitting devices, [15,23,24] and signal amplification in the fiber-optic communication system [3,25] have been explored. Recently, with the outstanding performance of halide perovskite materials in optoelectronic field, the perovskite NCs-doped glasses become a new research hotspot, especially for the applied research on white LED (wLED). For instance, wLED with a luminous efficiency of 50-60 lm W −1 and external efficiency of 20-25% was obtained with perovskite NCs-embedded glass slices as light converters. [24] Particularly, green light-emitting device made by CsPbBr 3 nano crystals (NCs)-embedded glass can realize a luminous efficiency of 118 lm W −1 and an external quantum efficiency of 28.14%. [24] Meanwhile, the luminescence intensity of CsPbBr 3 NCsembedded glass can be maintained above 90% when stored in water for a week or experienced a heating/cooling cycle at 100 °C. [17] QDs-embedded glasses have been studied for several decades. Although there are several review papers for a specific topic such as PbS QDs-doped glasses [26] and QDs-doped glasses for fibers, [27] to our best knowledge, no systematic overview has been made in QDs-embedded inorganic glasses until now. Here, we review the fabrication, luminescent properties, and potential application of QDs-embedded inorganic glasses. We first summarize the preparation methods and growth kinetics of QDs in glasses; we then review the optical properties and application explorations of IIB-VIA, IVB-VIA, and halide perovskite QDs-embedded glasses. Last we propose research directions to overcome the major challenges associated with these glasses for ultimate applications. Quantum dots (QDs)-embedded inorganic glasses combine the outstanding luminescent properties of QDs with the chemical, mechanical, and thermal stability of glasses, overcoming the instability bottleneck of QDs and facilitating their wide and endurable applications such as nonlinear optical devices, light emission, and signal amplification in the fiber-optic communication system. Typical QDs incorporated into glasses include IIB-VIA (e.g., ZnO, CdSe), IVB-VIA (e.g., PbS), and halide perovskite (CsPbBr 3 , et al.) QDs. Here, the preparation methods and growth kinetics of QDs in glasses ...

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Optical nonlinearities of glass doped with PbS nanocrystals

Cited by 45 publications

References 23 publications

Intensity-dependent bleaching relaxation in lead salt quantum dots

Intensity-dependent bleaching relaxation in lead salt quantum dots

Optical Nonlinearities in PbSe Nanocrystals

Semiconductor Quantum Dots‐Embedded Inorganic Glasses: Fabrication, Luminescent Properties, and Potential Applications

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