Low-threshold polariton lasing in a highly disordered conjugated polymer

Mu, Wei; Rajendran, Sai Kiran; Ohadi, Hamid; Tropf, Laura Christine; Gather, Malte C.; Turnbull, Graham A.; Samuel, Ifor D. W.

doi:10.1364/optica.6.001124

Cited by 47 publications

(65 citation statements)

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“…As seen in many materials [2,3], when pumped sufficiently, such polaritons transition to a "condensed" or lasing state, with macroscopic mode occupation and long range coherence. A wide variety of organic materials have shown polariton lasing [4][5][6][7][8][9][10][11][12][13][14][15] (for a review, see Ref. [16]).…”

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confidence: 99%

Multimode Organic Polariton Lasing

et al. 2020

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We present a beyond-mean-field approach to predict the nature of organic polariton lasing, accounting for all relevant photon modes in a planar microcavity. Starting from a microscopic picture, we show how lasing can switch between polaritonic states resonant with the maximal gain, and those at the bottom of the polariton dispersion. We show how the population of nonlasing modes can be found, and by using two-time correlations, we show how the photoluminescence spectrum (of both lasing and nonlasing modes) evolves with pumping and coupling strength, confirming recent experimental work on the origin of blueshift for polariton lasing.

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confidence: 99%

Multimode Organic Polariton Lasing

et al. 2020

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“…This value is at an intermediate range in between what has been observed in the ladder‐type conjugated polymer (MeLPPP) cavity [ 6 ] and our previous work on fluorene‐based cavities. [ 18,20 ] This blueshift may result from multiple reasons, including repulsive self‐interaction among polaritons, [ 6,19,21,23,35 ] gradual saturation of molecular optical transitions, and intermolecular energy migration. [ 36 ]…”

Section: Resultsmentioning

confidence: 99%

“…[ 16 ] In addition, their simple fabrication and broadband tunability can help realize large area and multi‐purpose polariton devices. There has been significant activity dedicated to organic polaritonics in the last decade, and several organic materials have now been reported to show room temperature polariton lasing, including the anthracene single crystal, [ 17 ] conjugated polymers, [ 6,18 ] oligofluorenes, [ 19,20 ] fluorescent proteins, [ 21,22 ] and fluorescent dyes. [ 23,24 ]…”

Section: Introductionmentioning

confidence: 99%

Room Temperature Polariton Lasing in Ladder‐Type Oligo(p‐Phenylene)s with Different π‐Conjugation Lengths

Fang

Rajendran

Wei

et al. 2020

Advanced Photonics Research

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Polariton lasing is coherent emission that originates from macroscopic accumulation of polariton population in the ground state and is a promising route toward efficient coherent light sources as population inversion is not necessary. Unlike most Wannier–Mott excitons in inorganic semiconductors, Frenkel excitons created in organic semiconductors have high oscillator strength and high exciton binding energy, which sustain stable exciton–polaritons at room temperature. Herein, room temperature polariton lasing from a novel class of ladder‐type oligo(p‐phenylene)s is demonstrated. The polariton lasers exhibit a nonlinear increase of their spectrally integrated emission, a reduction in spectral linewidth, blueshift of emission peaks, and long‐range spatial coherence when the pump fluence is increased above threshold. By tuning the π‐conjugation length of the molecular structure, the polariton lasing wavelength can be changed from 430 to 457 nm. Optically pumped thresholds of 12 and 17 μJ cm−2 are observed, which are among the lowest values reported for polariton lasing in organic semiconductors.

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“…Followed by the observation of analogous behavior in a thermal‐evaporated small‐molecule layer [ 159 ] and a spin‐coated polymer layer (MeLPPP), [ 160 ] the concept was quickly expanded. In a more recent report, [ 161 ] a highly disordered spin‐coated PFO film (with a much wider excitonic linewidth) was used as the active layer, showing a polariton threshold as low as 27.7 μJ cm −2 (one order of magnitude lower than the previous report in polymer polariton lasing). Rajendran et al investigated low‐threshold (17 μJ cm −2 ) polariton lasing from a spin‐coated pentafluorene layer (105 nm thick).…”

Section: Typical Resonator Architecturesmentioning

confidence: 98%

Toward Electrically Pumped Organic Lasers: A Review and Outlook on Material Developments and Resonator Architectures

Zhang

Wen²,

Huang³

et al. 2021

Advanced Photonics Research

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Organic lasers have undergone decades of development. A myriad of materials with excellent optical gain properties, including small molecules, dendrimers, and polymers, have been demonstrated. Various resonator geometries have also been applied. While sharing the advantages of the solution processability and mechanical flexibility features of organic materials, organic optical gain media also offer interesting optical properties, such as emission tunability through chemical functionalization and inherent large optical gain coefficients. They offer prospects for different applications in the fields of bioimaging, medicine, chemo‐ and biosensing, anticounterfeit applications, or displays. However, the realization of electrically pumped organic lasers still remains a challenge due to the inherent drawbacks of organic semiconductors, e.g., modest carrier mobility, long‐lived excited‐state absorption, and extra losses which originate in the device (e.g., absorption from metal electrodes). Herein, the past developments of organic lasers are discussed, highlighting the importance of materials and cavities with regard to the goal of electrically pumped organic lasers. The latest progress and the possible ways to address the challenge are discussed.

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Low-threshold polariton lasing in a highly disordered conjugated polymer

Cited by 47 publications

References 40 publications

Multimode Organic Polariton Lasing

Multimode Organic Polariton Lasing

Room Temperature Polariton Lasing in Ladder‐Type Oligo(p‐Phenylene)s with Different π‐Conjugation Lengths

Toward Electrically Pumped Organic Lasers: A Review and Outlook on Material Developments and Resonator Architectures

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