Controlled Förster energy transfer in emissive polymer Langmuir-Blodgett structures

Hill, Jimmy; Heriot, Sasha Y.; Worsfold, O.; Richardson, T.; Fox, A. M.; Bradley, Donal D. C.

doi:10.1103/physrevb.69.041303

Cited by 50 publications

(39 citation statements)

References 11 publications

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“…Hill et al 12 reported a 1 / x 2 distance dependence for a layered Langmuir-Blodgett polymer structure, consistent with energy transfer between extended dipoles in monolayers. 7 A 1/ x 3 distance dependence for transfer in a donor/acceptor polymer heterojunction was assumed by McGehee and coworkers 3,13 and proposed as a means of enhancing solar cell performance via either the incorporation of an acceptor polymer film to "harvest" excitons.…”

Section: Introductionmentioning

confidence: 78%

Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films

2008

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We report a systematic study of the scaling with distance of electronic energy transfer between thin films of conjugated polymers separated by a silica spacer. The energy-transfer kinetics were obtained directly from time-resolved photoluminescence measurements and show a 1 / z 3 distance dependence of the transfer rate between the excited donor and the acceptor film for z Ն 8 nm. This is consistent with Förster theory; but at shorter separations the energy transfer is slower than predicted and can be explained by the breakdown of the point-dipole approximation at z ϳ 5 nm. The results are relevant for organic photovoltaics and light-emitting devices, where energy transfer can provide a means of increasing performance.

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Section: Introductionmentioning

confidence: 78%

Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films

2008

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“…Finally, we note that this study is one of only a few to analyze the distance dependence of energy transfer between layers of donors and acceptors separated by a planar interface [36,[39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Influence of colloidal-gold films on the luminescence of Eu(TTFA)3 in PMMA

Lin¹,

Berry²,

May³

2010

Journal of Luminescence

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“…[18][19][20][21] However, the same PFO:F8BT blend system does not yield efficient optical gain. Amplified spontaneous emission (ASE) can be observed for certain compositions and pumping regimes but only with very high thresholds.…”

Section: Introductionmentioning

confidence: 99%

Host Exciton Confinement for Enhanced Förster‐Transfer‐Blend Gain Media Yielding Highly Efficient Yellow‐Green Lasers

Zhang

Liu

Wei

et al. 2018

Adv Funct Materials

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This paper reports state-of-the-art fluorene-based yellow-green conjugated polymer blend gain media using Förster resonant-energy-transfer from novel blue-emitting hosts to yield low threshold (≤7 kW cm −2 ) lasers operating between 540 and 590 nm. For poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) (15 wt%) blended with the newly synthesized 3,6-bis(2,7-di([1,1′-biphenyl]-4-yl)-9-phenyl-9H-fluoren-9-yl)-9-octyl-9H-carbazole (DBPhFCz) a highly desirable more than four times increase (relative to F8BT) in net optical gain to 90 cm −1 and 34 times reduction in amplified spontaneous emission threshold to 3 µJ cm −2 is achieved. Detailed transient absorption studies confirm effective exciton confinement with consequent diffusionlimited polaron-pair generation for DBPhFCz. This delays formation of host photoinduced absorption long enough to enable build-up of the spectrally overlapped, guest optical gain, and resolves a longstanding issue for conjugated polymer photonics. The comprehensive study further establishes that limiting host conjugation length is a key factor therein, with 9,9-dialkylfluorene trimers also suitable hosts for F8BT but not pentamers, heptamers, or polymers. It is additionally demonstrated that the host highest occupied and lowest unoccupied molecular orbitals can be tuned independently from the guest gain properties. This provides the tantalizing prospect of enhanced electron and hole injection and transport without endangering efficient optical gain; a scenario of great interest for electrically pumped amplifiers and lasers.

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Controlled Förster energy transfer in emissive polymer Langmuir-Blodgett structures

Cited by 50 publications

References 11 publications

Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films

Distance dependence of excitation energy transfer between spacer-separated conjugated polymer films

Influence of colloidal-gold films on the luminescence of Eu(TTFA)3 in PMMA

Host Exciton Confinement for Enhanced Förster‐Transfer‐Blend Gain Media Yielding Highly Efficient Yellow‐Green Lasers

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