Blinking suppression of single quantum dots in agarose gel

Ko, H. C.; Yuan, Chi‐Tsu; Lin, Shiuan Huei; Tang, Jau

doi:10.1063/1.3280386

Cited by 23 publications

(22 citation statements)

References 28 publications

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“…[24][25][26] Fluorescence blinking has been extensively investigated in semiconductor nanoparticles and organic molecules, providing unique insight into their photoexcited carrier dynamics. 24,[27][28][29][30][31][32] Based on confocal microscopy and super-resolution techniques, single molecule spectroscopy provides a powerful tool to investigate the fluorescence behaviour and carrier dynamics in a single nanoparticle.…”

mentioning

confidence: 99%

Mobile Charge-Induced Fluorescence Intermittency in Methylammonium Lead Bromide Perovskite

et al. 2015

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Organic-inorganic halide perovskite has emerged as a very promising material for solar cells due to its excellent photovoltaic enabling properties resulting in rapid increase in device efficiency over the last 3 years. Extensive knowledge and in-depth physical understanding in the excited state carrier dynamics are urgently required. Here we investigate the fluorescence intermittency (also known as blinking) in vapor-assisted fabricated CH3NH3PbBr3 perovskite. The evident fluorescence blinking is observed in a dense CH3NH3PbBr3 perovskite film that is composed of nanoparticles in close contact with each other. In the case of an isolated nanoparticle no fluorescence blinking is observed. The "ON" probability of fluorescence is dependent on the excitation intensity and exhibits a similar power rule to semiconductor quantum dots at higher excitation intensity. As the vapor-assisted fabricated CH3NH3PbBr3 perovskite film is a cluster of nanoparticles forming a dense film, it facilitates mobile charge migration between the nanoparticles and charge accumulation at the surface or at the boundary of the nanoparticles. This leads to enhanced Auger-like nonradiative recombination contributing to the fluorescence intermittency observed. This finding provides unique insight into the charge accumulation and migration and thus is of crucial importance for device design and improvement.

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mentioning

confidence: 99%

Mobile Charge-Induced Fluorescence Intermittency in Methylammonium Lead Bromide Perovskite

et al. 2015

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“…Blinking of QDs can be suppressed by surface passivation using large bang gap materials [22,23,85,86], thiols [34,83] or polymers [83,121]. Hollingsworth and coworkers have reported blinking suppression of single CdSe QD by varying the thickness of CdS or ZnS shell [85], which is similar to the near complete blinking suppression of CdS shelled CdSe QD by preparing shells from CdS [83].…”

Section: Modification Of Blinking By Surface Passivationmentioning

confidence: 93%

“…Blinking is an undesired disorder that prevents the applications of QDs in single photon [23,85,86,[115][116][117][118], thiols [34,83] and polymers [83,121], (ii) trapping of Auger electrons in well-defined electron traps [87,110,122], plasmon-assisted energy transfer [70,123], thermal activation [124], oxygen depletion [125], electron transfer to and from inorganic nanoparticles and organic molecules [87,104,110,122,126,127], and photoactivation [128,129]. Details of a few methods for blinking suppression are discussed below.…”

Section: Photoluminescence Blinking Of Single Qdsmentioning

confidence: 99%

Photoluminescence of CdSe and CdSe/ZnS quantum dots: Modifications for making the invisible visible at ensemble and single-molecule levels

Shibu

Hamada

Nakanishi

et al. 2014

Coordination Chemistry Reviews

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This thematic article is written with an intention to provide an overview of our recent research on the modulation of quantum dots photoluminescence and the applications of quantum dots to bioimaging. In particular, we summarize the physiochemical factors that affect the photoluminescence of CdSe or CdSe/ZnS quantum dots at ensemble and single-molecule levels, blinking and blinking suppression of quantum dots, bioconjugation of quantum dots, applications of bioconjugated quantum dots for analyzing some selected biophysical processes at single-molecule levels, and intracellular delivery of quantum dot bioconjugates. These research subjects are correlated with the state of the art accomplishments in the quantum dot field.

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“…In the last two decades, fluorescence blinking has been intensively investigated in various semiconductor QDs, single nanoparticles and organic molecules. [47][48][49][50][51][52] Two distinct types of physical mechanisms are generally attributed to the fluorescence quenching. A-type is the conventional blinking due to charging and discharging of the nanocrystal core, in which lower PL intensities correlate to shorter PL lifetimes.…”

Section: Fluorescence Intermittency In Single Perovskite Quantum Dot mentioning

confidence: 99%

Revealing Dynamic Effects of Mobile Ions in Halide Perovskite Solar Cells Using Time‐Resolved Microspectroscopy

et al. 2020

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Halide perovskites are promising candidate materials for the next generation high-efficiency optoelectronic devices. Since perovskites are electronic-ionic mixed conductors, ion dynamics have a critical impact on the performance and stability of perovskite-based applications. However, comprehensively understanding ionic dynamics is challenging, particularly on nanoscale imaging of ionic dynamics in perovskites. In this review, mobile ion dynamics in halide perovskites investigated via luminescence spectroscopy combined with confocal microscopy are discussed, including mobile ion induced fluorescence quenching, phase segregation in mixed halide hybrid perovskite, and mobile ion accumulation at the interface in perovskite devices. Steady-state and time-resolved luminescence imaging techniques, combined with confocal microscopy, are unique tools for probing ionic dynamics in perovskites, providing invaluable insights on ionic dynamics in nanoscale resolution, along with a wide temporal range from picoseconds to hours. The works in this review are not only for understanding mobile ions to improve the design of perovskite-based devices but also foster the development of microspectroscopic methodologies in a broader solid-state physics context of investigating ionic transports in polycrystalline materials.

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Blinking suppression of single quantum dots in agarose gel

Cited by 23 publications

References 28 publications

Mobile Charge-Induced Fluorescence Intermittency in Methylammonium Lead Bromide Perovskite

Mobile Charge-Induced Fluorescence Intermittency in Methylammonium Lead Bromide Perovskite

Photoluminescence of CdSe and CdSe/ZnS quantum dots: Modifications for making the invisible visible at ensemble and single-molecule levels

Revealing Dynamic Effects of Mobile Ions in Halide Perovskite Solar Cells Using Time‐Resolved Microspectroscopy

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