Low Threshold Room Temperature Polariton Lasing from Fluorene‐Based Oligomers

Ruseckas, Arvydas; Mai, Van T. N.; Shukla, Atul; Allison, Ilene; Lo, Shih‐Chun; Namdas, Ebinazar B.; Turnbull, Graham A.; Samuel, Ifor D. W.

doi:10.1002/lpor.202100028

Cited by 18 publications

(13 citation statements)

References 47 publications

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“…Polariton lasing was thus envisioned with intriguing characteristics and closely related to BEC [116] . An attractive feature of polariton lasers is that they can operate with significantly lower thresholds compared to their photonic counterparts [35,[117][118][119][120] .…”

Section: Polariton Lasermentioning

confidence: 99%

Microcavity exciton polaritons at room temperature

Ghosh

Zhao

et al. 2022

Photonics Insights

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The quest for realizing novel fundamental physical effects and practical applications in ambient conditions has led to tremendous interest in microcavity exciton polaritons working in the strong coupling regime at room temperature. In the past few decades, a wide range of novel semiconductor systems supporting robust exciton polaritons have emerged, which has led to the realization of various fascinating phenomena and practical applications. This paper aims to review recent theoretical and experimental developments of exciton polaritons operating at room temperature, and includes a comprehensive theoretical background, descriptions of intriguing phenomena observed in various physical systems, as well as accounts of optoelectronic applications. Specifically, an in-depth review of physical systems achieving room temperature exciton polaritons will be presented, including the early development of ZnO and GaN microcavities and other emerging systems such as organics, halide perovskite semiconductors, carbon nanotubes, and transition metal dichalcogenides. Finally, a perspective of outlooking future developments will be elaborated.

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Section: Polariton Lasermentioning

confidence: 99%

Microcavity exciton polaritons at room temperature

Ghosh

Zhao

et al. 2022

Photonics Insights

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“…[47,48] Samuel et al have recently demonstrated room temperature polariton lasing with lowest reported thresholds in organic semiconductor molecules of fluorene-based oligomers. [49] Since polariton lasing does not involve energy-level systems, this type of laser will not be discussed here.…”

Section: General Excited-state Process For Organic Lasersmentioning

confidence: 99%

Advances in Energy‐Level Systems of Organic Lasers

Wang

Liao

2022

Laser & Photonics Reviews

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Organic gain materials, with the merit of abundant excited-state processes with large stimulated emission cross-section, show considerable potential in lasers. The abundant excited-state processes provide excellent platform for the construction of various forms of energy-level systems, based on which the efficient population inversion and the tailorable gain region are supported. Herein, the development of organic lasers with distinctive energy-level systems is summarized according to the classification of excited-state gain processes including singlet quasi-four-level transition, energy transfer, excimer, charge transfer (CT), excited-state intramolecular proton transfer (ESIPT), and some other novel photophysical processes, giving deep insight into the inherent relationship between energy-level systems and laser action. Finally, the challenges and perspectives for the future development are presented, hopefully to offer valuable enlightenment for the further optimization of energy-level systems toward high-gain organic lasers including electrically pumped organic lasers.

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“…Polariton formation has been demonstrated in various materials, e.g., inorganic semiconductors, − and Rydberg atoms , at low temperatures. Room-temperature polaritons have been observed experimentally in organic materials, followed by the emergence of unusual phenomena such as the formation of polaritonic Bose–Einstein condensates at room temperature, , polariton lasing, − and ultra-long-range energy transport. − The reason behind the formation of stable room-temperature polaritons in organics is their low dielectric constants, which give rise to the formation of bound electron–hole pairs with a large binding energy, on the order of 0.5–1 eV. In addition, organic dyes also possess large transition dipole moments, which enhances the light–matter interaction.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Investigation of the Rate of Intersystem Crossing in the Strong Exciton–Photon Coupling Regime

2023

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Strong interactions between excitons and photons lead to the formation of exciton-polaritons, which possess completely different properties compared to their constituents. The polaritons are created by incorporating a material in an optical cavity where the electromagnetic field is tightly confined. Over the last few years, the relaxation of polaritonic states has been shown to enable a new kind of energy transfer event, which is efficient at length scales substantially larger than the typical Förster radius. However, the importance of such energy transfer depends on the ability of the short-lived polaritonic states to efficiently decay to molecular localized states that can perform a photochemical process, such as charge transfer or triplet states. Here, we investigate quantitatively the interaction between polaritons and triplet states of erythrosine B in the strong coupling regime. We analyze the experimental data, collected mainly employing angle-resolved reflectivity and excitation measurements, using a rate equation model. We show that the rate of intersystem crossing from the polariton to the triplet states depends on the energy alignment of the excited polaritonic states. Furthermore, it is demonstrated that the rate of intersystem crossing can be substantially enhanced in the strong coupling regime to the point where it approaches the rate of the radiative decay of the polariton. In light of the opportunities that transitions from polaritonic to molecular localized states offer within molecular photophysics/chemistry and organic electronics, we hope that the quantitative understanding of such interactions gained from this study will aid in the development of polariton-empowered devices.

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Low Threshold Room Temperature Polariton Lasing from Fluorene‐Based Oligomers

Cited by 18 publications

References 47 publications

Microcavity exciton polaritons at room temperature

Microcavity exciton polaritons at room temperature

Advances in Energy‐Level Systems of Organic Lasers

Quantitative Investigation of the Rate of Intersystem Crossing in the Strong Exciton–Photon Coupling Regime

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