Fluorescence Blinking, Exciton Dynamics, and Energy Transfer Domains in Single Conjugated Polymer Chains

Lin, Hongzhen; Tabaei, Seyed R.; Thomsson, Daniel; Mirzov, Oleg; Larsson, Per‐Olof; Scheblykin, Ivan G.

doi:10.1021/ja800153d

Cited by 125 publications

(181 citation statements)

References 68 publications

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“…Later detailed studies at higher temporal resolution confi rmed the appearance of a short-lifetime component in the dim states. Together with polarization-modulation experiments, these results have been used to propose a model of a single MEH-PPV chain in which the chain consists of several energy-transfer domains and the energy migration is effi cient within a domain and ineffi cient between domains [58]. Th e entire domain can be quenched if it is within the eff ective radius of a quencher.…”

Section: Review Articlementioning

confidence: 99%

Conformation and physics of polymer chains: a single-molecule perspective

Vácha

Habuchi

2010

NPG Asia Mater

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N anotechnology has been one of the driving forces of science and technology over the past 20 years. Scaling down the size of an object to nanometer dimensions can result in dramatic changes to its physical properties. With recent progress in the nanoscience and nanotechnology of polymeric materials, new methods are now required for the characterization of polymer structures and properties. Despite the great success of electron microscopy and scanning probe microscope techniques, there remains a need for a non-invasive method that could provide information not only on the structure but also on the physical phenomena occurring on the nanoscale level. One method that has recently emerged as an excellent tool for nanoscale characterization is single-molecule optical detection and spectroscopy. Single-molecule spectroscopy relies on the detection and measurement of the fl uorescence signal and spectra from single isolated molecules or polymer chains (Figure 1). Th ese can either be immobilized in a solid matrix or be diff using in a solution or melt. In all cases, the concentration of the emitting molecules must be suffi ciently low to ensure that the spatial separation between individual molecules is larger than the optical resolution of the setup, typically on the order of micrometers. As the fl uorescence signal from a molecule is strongly infl uenced by the nanoscale environment, measuring many molecules one by one provides the distribution of physical properties of the respective nano-environments. Moreover, monitoring a molecule over a period of time reveals dynamic changes in its environment. Th ese static and dynamic heterogeneities of nanoscale properties are averaged and hidden in the usual ensemble experiments. Th e strength of fl uorescence detection is in its sensitivity and low background level -emissions of just a few hundred photons per second can be readily detected. Th e technique also off ers remarkable dynamic range, from sub-nanosecond timescales to seconds and longer, and is non-invasive, making it possible to detect emissions from molecules buried deep in a sample.Single-molecule spectroscopy has evolved since the beginning of the 1990s from low-temperature, high-resolution optical spectroscopic

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Section: Review Articlementioning

confidence: 99%

Conformation and physics of polymer chains: a single-molecule perspective

Vácha

Habuchi

2010

NPG Asia Mater

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“…To address this loss process efficiently, it is necessary that the underlying mechanism is known. In literature, attention is mainly given to resonance energy transfer as the main loss mechanism [4,[8][9][10]. This, however, does not exclude other competing loss processes like charge transfer (CT) [10,11].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

et al. 2014

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An important loss mechanism in organic electroluminescent devices is exciton quenching by polarons. Gradual electrochemical doping of various conjugated polymer films enabled the determination of the doping density dependence of photoluminescence quenching. Electrochemical doping was achieved by contacting the film with a solid electrochemical gate and an injecting contact. A sharp reduction in photoluminescence was observed for doping densities between 10 18 and 10 19 cm −3 . The doping density dependence is quantitatively modeled by exciton diffusion in a homogeneous density of polarons followed by either Förster resonance energy transfer or charge transfer. Both mechanisms need to be considered to describe polaron-induced exciton quenching. Thus, to reduce exciton-polaron quenching in organic optoelectronic devices, both mechanisms must be prevented by reducing the exciton diffusion, the spectral overlap, the doping density, or a combination thereof.

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“…5 All these interactions are dependent on material morphology on a nanometer scale, leading to a huge diversity of the properties of individual CP molecules. 6 The morphology of the composite polymer films can be manipulated by using different organic solvents, concentrations, annealing, and spin coating speeds, thereby tailor the optical and electrical properties of the polymer films in photoelectric devices on demand.…”

mentioning

confidence: 99%

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

Yang

Lin

et al. 2015

Applied Physics Letters

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We investigated the transitions of conformations and their effects on emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) single molecules in PMMA matrix during thermal annealing process. Total internal reflection fluorescence microscopy measurements reveal the transformation from collapsed conformations to extended, highly ordered rod-like structures of MEH-PPV single molecules during thermal annealing. The blue shifts in the ensemble single molecule PL spectra support our hypnosis. The transition occurs as the annealing temperature exceeds 100 °C, implying that an annealing temperature near the glass transition temperature Tg of matrix is ideal for the control and optimization of blend polymer films.

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Fluorescence Blinking, Exciton Dynamics, and Energy Transfer Domains in Single Conjugated Polymer Chains

Cited by 125 publications

References 68 publications

Conformation and physics of polymer chains: a single-molecule perspective

Conformation and physics of polymer chains: a single-molecule perspective

Photoluminescence quenching in films of conjugated polymers by electrochemical doping

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

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