Chemical Quenching of the Triplet State in Flashlamp-Excited Liquid Organic Lasers

Marling, J.B.; Gregg, D.W.; Wood, Lloyd

doi:10.1063/1.1653296

Cited by 75 publications

(29 citation statements)

References 5 publications

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“…[27] It was demonstrated that the accumulation of dye molecules in the triplet state can be reduced by adding such molecules to the dye solution. [27,28] In this way, quenching of the lasing emission by triplets might be almost eliminated. To reduce triplet accumulation, the triplet-scavenger molecule should meet a set of important requirements:…”

Section: Introductionmentioning

confidence: 99%

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Triplet Excitation Scavenging in Films of Conjugated Polymers

et al. 2009

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Phosphorescence and delayed fluorescence of polyfluorene polymer films doped with cyclooctatetraene (COT) and anthracene are studied by means of time-resolved photoluminescence (PL) measurements. The occurrence of an anomalous nonvertical triplet energy transfer in solid conjugated polymer films is demonstrated for the first time employing the "nonvertical" COT triplet acceptor, which appears to behave similarly to conventional vertical triplet acceptors, such as anthracene. Both dopant molecules are found to efficiently quench the host phosphorescence of the polymer without affecting the host fluorescence--this can be attributed to the large singlet-triplet (S(1)-T(1)) splitting of these molecules. This S(1)-T(1) splitting is exceptionally large in COT due to its low-lying relaxed triplet state, which is capable of accepting host triplet excitations. In contrast to anthracene, the triplet lifetime of the COT molecules is reasonably short, thus making a fast deactivation of the triplet excitations possible. This suggests that nonvertical triplet scavengers might be promising candidates for quenching the host triplet excitations in future electrically pumped fluorescence organic lasers, which suffer from excessive triplet-state losses.

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Section: Introductionmentioning

confidence: 99%

“…The use of COT as an efficient triplet scavenger for several laser dye solutions is well documented, [27,28] particularly, it was used commercially in Rhodamine-6G dye lasers to reduce excited triplet absorption. The mechanism of the energy-transfer process has also been investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

Triplet Excitation Scavenging in Films of Conjugated Polymers

et al. 2009

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“…We have recently shown ( 2 6 ) that this radiationless decay is an activated process having an apparent activation energy of 4-7 kcal/mole for both rhodamine B and rhodamine 6G, with rate constants on the order of We note in passing that some confusion has been allowed to persist in the literature with regard to the structure of Kiton Red S. The structure given by Drake, et al, ( 2 7 ) is in fact the structure of the well-known dye, sulforhodamine B(2 8 ). There is, however, a wellcharacterized azo dye which is repeatedly referred to in the Color Index as Kiton Red S(29).…”

Section: Batellmentioning

confidence: 99%

Mechanisms of Photochemical Degradation in Xanthene Laser Dyes.

Schwerzel¹,

Edie²

1981

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“…A marked im provement of laser perform ance of a dye laser can be achieved when a triplet quencher is added to the dye solution being an active medium. Some in organic as well as organic triplet quenchers are known [2,3]. As a triplet quencher for xanthene dyes very often 1,3,5,7-cyclooctatetraene-C8H 8 (COT) is used.…”

Section: Introductionmentioning

confidence: 99%