Highly Emissive Nanostructured Thin Films of Organic Host–Guests for Energy Conversion

Moreau, Jean‐Louis; Giovanella, Umberto; Bombenger, J.-P.; Porzio, William; Vohra, Varun; Spadacini, Laura; Silvestro, Giuseppe Di; Barba, Luisa; Arrighetti, Gianmichele; Destri, Silvia; Pasini, Mariacecilia; Saba, Michele; Quochi, Francesco; Mura, Andrea; Bongiovanni, Giovanni; Fiorini, M.; Uslenghi, M.; Botta, Chiara

doi:10.1002/cphc.200800682

Cited by 69 publications

(70 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Absolute fluorescence quantum yields were determined with an integrating sphere. 8 Data Evaluation. The ET efficiency, Φ ET , is defined as the where V DX is the exciton coupling between the initial (D*X) and the final state (DX*), with "X" being D or A, s 2 is the screening factor, and J DX is the spectral overlap between the emission spectrum of D and the absorption spectrum of "X", both area-normalized on the energy scale.…”

Section: Experimental and Computational Detailsmentioning

confidence: 99%

Spatial Control of 3D Energy Transfer in Supramolecular Nanostructured Host−Guest Architectures

et al. 2009

Self Cite

View full text Add to dashboard Cite

Systematic control of 3D energy transfer (ET) dynamics is achieved in supramolecular nanostructured host-guest systems using spacer-functionalized guest chromophores. Quantum chemistry-based Monte Carlo simulations reveal the strong impact of the spacer length on the ET dynamics, efficiency, and dimensionality. Remarkably high exciton diffusion lengths demonstrate that there is ample scope for optimizing oligomeric or polymeric optoelectronic devices.Resonant energy transfer (ET) is a fundamental process in light harvesting by biological systems that can also be exploited for funneling electronic excitations in optoelectronic devices. The increasing interest in tailor-made organic conjugated materials for these devices requires a thorough understanding of diffusion-enhanced three-dimensional (3D) ET and modeling of intermolecular interactions beyond the classical Fö rster picture due to the close proximity of the molecules in solid-state device architectures. 1 New preparative approaches, such as supramolecular donor-acceptor systems, 2,3 in hand with a realistic theoretical description might tap the full potential of material design for optimized devices.In recent years, increasing attention has been paid to highly ordered supramolecular nanostructured host-guest compounds (HGCs), based either on organic 4-14 or on inorganic optically inert hosts; 15-17 in such systems, the degree of both energetic and positional disorder is small, leading to enhanced properties for optoelectronic applications. [9][10][11][12]15 In a previous study, we have used the organic nanochannel forming host perhydrotriphenylene (PHTP) to investigate 3D ET processes between weakly coupled chromophores by including rod-like donor (D) and acceptor (A) molecules at low A:D ratios. 9 By running Monte Carlo (MC) simulations and treating ET on a quantumchemical level, we were able to describe 3D ET in these systems quantitatively without using adjustable parameters. In the present study, we go a step further by using donor molecules with terminal alkyl spacer groups to systematically vary the distance between the centers of two adjacent donor moieties from 2 to 6 nm, thus gaining full spatial control of 3D ET. By combining experiments and simulations, we are able to understand the details of electronic excitation dynamics, in particular the length and directionality of exciton diffusion, as a function of intermolecular separation. In this respect, our MC approach provides a flexible toolbox for future design of optimized materials for optoelectronic applications.The systems under study are presented in Figure 1. The donor molecules nSDSB are derived from p,p-distyrylbenzene (DSB) by attaching two terminal H(CH 2 ) n O-substituents of variable lengths (with n the number of carbon atoms). The acceptor molecule quinquethiophene (5T) is added at molar doping ratios (x 5T ) ranging from 10 -4 to 10 -1 . The guest molecules are embedded in the channels of the pseudohexagonal PHTP host lattice, adjacent molecules in the same channel being in van der...

show abstract

Section: Experimental and Computational Detailsmentioning

confidence: 99%

Spatial Control of 3D Energy Transfer in Supramolecular Nanostructured Host−Guest Architectures

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…PL spectra are excited with a monochromated Xe lamp and PL excitation profiles (PLE) are obtained by using Rhodamine B as standard. PL QYs are obtained with a home-made integrating sphere [14].…”

Section: Methodsmentioning

confidence: 99%

π-Stacked polybenzofulvene derivatives as hosts for yellow and red emitting OLEDs

et al. 2015

Self Cite

View full text Add to dashboard Cite

“…Photoluminescence (PL) spectra of solid state materials were recorded on a Jasco Fp 6600 spectrofluorometer. The PL quantum yields (QY) were obtained using an home-made integration sphere following the procedure already reported 18 .…”

Section: Methodsmentioning

confidence: 99%

Near IR to Red Up-Conversion in Tetracene/Pentacene Host/Guest Cocrystals Enhanced by Energy Transfer from Host to Guest

et al. 2015

Self Cite

View full text Add to dashboard Cite

Solid-state materials with up-conversion activity at low power excitation are highly desirable for several optoelectronic applications. In this work we show that a host/guest cocrystal of tetracene/pentacene (Tc/Pc) exhibits a near-infrared (NIR) excited up-conversion process. Förster resonant energy transfer (FRET) from Tc to Pc is enhanced by NIR excitation with respect to visible excitation. A triplet–triplet annihilation mechanism activated by the pentacene molecules acting as traps in the host crystal is proposed and confirmed by time-resolved fluorescence spectra. TDDFT calculations on model molecular clusters support this hypothesis, highlighting the existence of strong excitonic interactions which is a necessary prerequisite for good transport of photogenerated excitons in Pc-doped Tc crystals

show abstract

Highly Emissive Nanostructured Thin Films of Organic Host–Guests for Energy Conversion

Cited by 69 publications

References 31 publications

Spatial Control of 3D Energy Transfer in Supramolecular Nanostructured Host−Guest Architectures

Spatial Control of 3D Energy Transfer in Supramolecular Nanostructured Host−Guest Architectures

π-Stacked polybenzofulvene derivatives as hosts for yellow and red emitting OLEDs

Near IR to Red Up-Conversion in Tetracene/Pentacene Host/Guest Cocrystals Enhanced by Energy Transfer from Host to Guest

Contact Info

Product

Resources

About