2012
DOI: 10.1039/c2cc31843a
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Plasmonic surface enhancement of dual fluorescence and phosphorescence emission from organic semiconductors: effect of exchange gap and spin–orbit coupling

Abstract: Dual singlet-triplet fluorescence-phosphorescence emitting compounds demonstrate that plasmonic surface enhancement is controlled solely by the underlying oscillator strength of a transition: metal-free compounds with weak spin-orbit coupling show no enhancement in phosphorescence efficiency even though fluorescence is amplified.Excitement in the area of plasmonics stems from the ability to detect processes that are otherwise undetectable. Collective electron oscillations at metal surfaces experience strong sp… Show more

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Cited by 18 publications
(11 citation statements)
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“…These include metal enhanced rare-earth ion luminescence applied to OLEDs, 17-21 enhancement of organic solar cells with plasmonic nanoparticles, 22,23 and enhanced excitation of phosphorescent dyes related to photodynamic therapy. [27][28][29] Surprisingly, although theory predicts that lifetime modifications similar to that for fluorescence should occur in the case the triplet transition is dipolar in nature (and even larger lifetime modifications in the case it is quadrupolar in nature 30 ), experimental results so far have observed much weaker modification of phosphorescence lifetimes compared to fluorescence lifetimes. [27][28][29] Surprisingly, although theory predicts that lifetime modifications similar to that for fluorescence should occur in the case the triplet transition is dipolar in nature (and even larger lifetime modifications in the case it is quadrupolar in nature 30 ), experimental results so far have observed much weaker modification of phosphorescence lifetimes compared to fluorescence lifetimes.…”
Section: Introductionmentioning
confidence: 99%
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“…These include metal enhanced rare-earth ion luminescence applied to OLEDs, 17-21 enhancement of organic solar cells with plasmonic nanoparticles, 22,23 and enhanced excitation of phosphorescent dyes related to photodynamic therapy. [27][28][29] Surprisingly, although theory predicts that lifetime modifications similar to that for fluorescence should occur in the case the triplet transition is dipolar in nature (and even larger lifetime modifications in the case it is quadrupolar in nature 30 ), experimental results so far have observed much weaker modification of phosphorescence lifetimes compared to fluorescence lifetimes. [27][28][29] Surprisingly, although theory predicts that lifetime modifications similar to that for fluorescence should occur in the case the triplet transition is dipolar in nature (and even larger lifetime modifications in the case it is quadrupolar in nature 30 ), experimental results so far have observed much weaker modification of phosphorescence lifetimes compared to fluorescence lifetimes.…”
Section: Introductionmentioning
confidence: 99%
“…[24][25][26] However, only a few examples in the literature look into the basic behaviour of the triplet transition as compared to the normal singlet transition. [27][28][29] Surprisingly, although theory predicts that lifetime modifications similar to that for fluorescence should occur in the case the triplet transition is dipolar in nature (and even larger lifetime modifications in the case it is quadrupolar in nature 30 ), experimental results so far have observed much weaker modification of phosphorescence lifetimes compared to fluorescence lifetimes.…”
Section: Introductionmentioning
confidence: 99%
“…Some PZ derivatives can also present steady-state phosphorescence, relatively weak but observable at room temperature. 11 The detection of phosphorescence properties of PZ or PZ derivatives through gated intensified charge-coupled devices (iCCD's), would be also useful as a second experimental signature in order to use them as markers in intra-cellular or related media. In an early work, 12 a PZ derivative was designed and synthesized, being used lately as selective metal sensor and demonstrating selectivity for cadmium ions, which are very dangerous for the human life.…”
Section: Introductionmentioning
confidence: 99%
“…800 nm) of Pd-TPTBP. In the presence of plasmonic metal nanoparticles, energy transfer from the sensitizer to the plasmonic metal nanoparticles can be induced, even at a separation distance greater than 10 nm between them through LSP-induced mechanisms including fluorescence resonance energy transfer, nanometal surface energy transfer, and plasmon-enhanced fluorescence energy transfer. Since the average thickness of TTA-UC thin films was measured as 7.2 nm, there is a high possibility that the TTET and the energy transfer to metal nanoparticles would compete in the deactivation process of the triplet excited sensitizer in the films. Consequently, by overlapping the LSP band with the phosphorescence wavelength of the sensitizer, the appearance of a new pathway of energy transfer to the LSP of metal nanoparticles, k D,LSP , should effectively suppress the TTET efficiency, thereby resulting in a decrease in the upconverted emission intensity, as shown in Figure A and eqs and . , …”
Section: Results and Discussionmentioning
confidence: 99%