Stimulated emission and lasing in conjugated polymers

Lemmer, Uli

doi:10.1002/(sici)1099-1581(199807)9:7<476::aid-pat801>3.0.co;2-8

Cited by 11 publications

(5 citation statements)

References 26 publications

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“…They are reasonable and confirm the basic validity of the model. The effective cross section for stimulated emission σ is derived as 0.017 nm 2 and thereby within the range that would be expected for conjugated polymers, 4,46,48,49 comparable, e.g., to the value reported for ladder-type poly(p-phenylene)s of 0.015 nm 2 . 46 However, this has to be seen as a weighted average over the wavelength range of stimulated emission.…”

Section: B Amplified Spontaneous Emission (Ase)supporting

confidence: 78%

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Photoexcitation dynamics in polyfluorene-based thin films: Energy transfer and amplified spontaneous emission

Marciniak¹,

Teicher²,

Scherf³

et al. 2012

Phys. Rev. B

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The dynamics of photoexcitations in thin films based on the polymer poly(9,9-dioctylfluorene) is investigated by a combination of stationary spectroscopy, femtosecond absorption and time-resolved fluorescence measurements. Excitation energy transfer to keto defects within the polyfluorene host matrix and to guest molecules in a dye doped host/guest system is observed and modeled by rate equations. Characteristic parameters for the exciton dynamics are extracted. At high excitation densities, amplified spontaneous emission from the edge of the films arises accompanied by strongly nonexponential signal decay in transient absorption. The underlying coupled excited-state and photon dynamics in the films are included in the model, which describes the measured data consistently for various excitation densities.

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Section: B Amplified Spontaneous Emission (Ase)supporting

confidence: 78%

“…[4][5][6][7] Polyfluorenes can act as emitters themselves or serve as absorbing host materials for guest dyes that get excited via energy transfer and emit at longer wavelengths, thus enabling color tuning. 8,9 Poly(9,9-dioctylfluorene) (PFO) is a prototypical example.…”

Section: Introductionmentioning

confidence: 99%

Photoexcitation dynamics in polyfluorene-based thin films: Energy transfer and amplified spontaneous emission

Marciniak¹,

Teicher²,

Scherf³

et al. 2012

Phys. Rev. B

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“…To date, only optically pumped lasing has been observed for conjugated polymers, but it is hoped to eventually obtain electrically pumped polymer laser diodes. A discussion of the methods used to obtain lasing from conjugated polymers and of the prospects for obtaining electrically pumped polymer lasers lies outside the scope of this review, and so the reader is referred to the reviews by Lemmer, Tessler, and McGehee and Heeger . There are also short accounts by the groups of Heeger , and Friend of their contributions to this field.…”

Section: Other Types Of El Devices Using Conjugated Polymersmentioning

confidence: 99%

Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices

et al. 2009

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“…Light-emitting polymers (LEPs) have attracted considerable interest worldwide due to their practical applications in a large variety of optoelectronic devices and their multiple potential advantages concerning preparation and operation over other display and lighting technologies. − A great variety of LEPs have been developed, and their physicochemical properties have been well characterized. Among them, we can mention LEPs based on poly( p -phenylenevinylene) (PPV), poly( p -phenylene) (PPP), polyacetylene, polyaniline, polypyrrole, polyfluorene, and polythiophene structural motifs.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Photoexcited Dynamics in Bichromophoric Cross-Shaped Oligofluorene

et al. 2014

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The non-adiabatic excited state molecular dynamics (NA-ESMD) approach is applied to investigate photoexcited dynamics and relaxation pathways in a spiro-linked conjugated polyfluorene at room (T = 300 K) and low (T = 10 K) temperatures. This dimeric aggregate consists of two perpendicularly oriented weakly interacting α-polyfluorene oligomers. The negligible coupling between the monomer chains results in an initial absorption band composed of equal contributions of the two lowest excited electronic states, each localized on one of the two chains. After photoexcitation, an efficient ultrafast localization of the entire electronic population to the lowest excited state is observed on the time scale of about 100 fs. Both internal conversion between excited electronic states and vibronic energy relaxation on a single electronic state contribute to this process. Thus, photoexcited dynamics of the polyfluorene dimer follows two distinct pathways with substantial temperature dependence on their efficiency. One relaxation channel involves resonance electronic energy transfer between the monomer chains, whereas the second pathway concerns the relaxation of the electronic energy on the same chain that has been initially excited due to electron-phonon coupling. Despite the slower vibrational relaxation, a more efficient ultrafast electronic relaxation is observed at low temperature. Our numerical simulations analyze the effects of molecular geometry distortion during the electronic energy redistribution and suggest spectroscopic signatures reflecting complex electron-vibrational dynamics.

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Stimulated emission and lasing in conjugated polymers

Cited by 11 publications

References 26 publications

Photoexcitation dynamics in polyfluorene-based thin films: Energy transfer and amplified spontaneous emission

Photoexcitation dynamics in polyfluorene-based thin films: Energy transfer and amplified spontaneous emission

Synthesis of Light-Emitting Conjugated Polymers for Applications in Electroluminescent Devices

Computational Study of Photoexcited Dynamics in Bichromophoric Cross-Shaped Oligofluorene

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