Photophysical characterization of the 9,10-disubstituted anthracene chromophore and its applications in triplet–triplet annihilation photon upconversion

Gray, Victor; Dzebo, Damir; Lundin, Angelica; Alborzpour, Jonathan; Abrahamsson, Maria; Albinsson, Bo; Moth‐Poulsen, Kasper

doi:10.1039/c5tc02626a

Cited by 129 publications

(135 citation statements)

References 81 publications

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“…The acceptor 1 , synthesized using 9‐bromo‐10‐phenylanthracene and 4‐pyridylboronic acid, showed almost identical absorption and fluorescence spectra to DPA in chloroform (Figure S1, Supporting Information). This indicates that the singlet energy level of 1 is basically similar to DPA, which would also be the case for the triplet level . The acceptor 1 showed a high fluorescence quantum yield of 86 % with a lifetime of 8.6 ns in dearated chloroform ([ 1 ]=10 m m , λ ex =365 nm, λ em =433 nm).…”

Section: Figurementioning

confidence: 71%

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Employing Core‐Shell Quantum Dots as Triplet Sensitizers for Photon Upconversion

Okumura

Mase

Yanai

et al. 2016

Chemistry A European J

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A new family of surface-functionalized CdSe/ZnS core-shell quantum dots (csQD) has been developed, which work as triplet sensitizers for triplet-triplet annihilation-based photon upconversion (TTA-UC). The surface modification of csQD with acceptor molecules plays a key role in the efficient relay of the excited energy of csQD to emitter molecules in the bulk solution, where the generated emitter triplets undergo triplet-triplet annihilation that leads to photon upconversion. Interestingly, improved UC properties were achieved with the core-shell QDs compared with core-only CdSe QDs (cQD). The threshold excitation intensity, which is defined as the necessary irradiance to achieve efficient TTA process, decreases by more than a factor of four. Furthermore, the total UC quantum yield is enhanced more than 50-fold. These enhancements should be derived from better optical properties of csQD, in which the non-radiative surface recombination sites are passivated by the shell layer with wider bandgap.

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Section: Figurementioning

confidence: 71%

“…This indicates that the singlet energy level of 1 is basically similart oD PA,w hich would also be the case for the triplet level. [7] The acceptor 1 showedahigh fluorescence quantum yield of 86 %w ith al ifetime of 8.6 ns in dearated chloroform ([1] = 10 mm, l ex = 365 nm, l em = 433 nm).…”

mentioning

confidence: 99%

Employing Core‐Shell Quantum Dots as Triplet Sensitizers for Photon Upconversion

Okumura

Mase

Yanai

et al. 2016

Chemistry A European J

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“…1 and 3 have also been used as annihilators in TTA upconversion applications, with reported quantum efficiencies of 7.9 and 4.6%, respectively4850. All three annihilators are able to upconvert light in the liquid crystalline matrix.…”

Section: Resultsmentioning

confidence: 99%

Photon upconversion with directed emission

et al. 2016

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Photon upconversion has the potential to increase the efficiency of single bandgap solar cells beyond the Shockley Queisser limit. Efficient light management is an important point in this context. Here we demonstrate that the direction of upconverted emission can be controlled in a reversible way, by embedding anthracene derivatives together with palladium porphyrin in a liquid crystalline matrix. The system is employed in a triplet-triplet annihilation photon upconversion scheme demonstrating controlled switching of directional anti Stokes emission. Using this approach an emission ratio of 0.37 between the axial and longitudinal emission directions and a directivity of 1.52 is achieved, reasonably close to the theoretical maximal value of 2 obtained from a perfectly oriented sample. The system can be switched for multiple cycles without any visible degradation and the speed of switching is only limited by the intrinsic rate of alignment of the liquid crystalline matrix.

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“…[36,37] PtOEP besitzt aufgrund der hohen Spin-Bahn-Kopplung,die durch das schwere Pt-Atom mit einer S 0 !T 1 Tr iplettenergie von 1.921 eV induziert wird, eine gute Interkombinationseffizienz. [36,37] PtOEP besitzt aufgrund der hohen Spin-Bahn-Kopplung,die durch das schwere Pt-Atom mit einer S 0 !T 1 Tr iplettenergie von 1.921 eV induziert wird, eine gute Interkombinationseffizienz.…”

Section: Angewandte Chemieunclassified

Anti‐Stokes‐Belastungsanzeige: Mechanochemische Aktivierung der Triplett‐Triplett‐Annihilierung‐Photonen‐Hochkonversion

et al. 2019

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Die Entwicklung von Methoden zum Nachweis von Schädeni nm akromolekularen Materialien ist von großer Bedeutung, um deren mechanisches Versagen und die Struktur-Eigenschafts-Beziehungen von Polymeren zu verstehen. Mechanofluorophore haben sich als nützliche und empfindlichem olekulare Motive fürd iesen Zweck erwiesen. Die Anpassung ihrer optischen Eigenschaften bleibt jedochb is heute eine Herausforderung, und die Korrelation der Emissionsintensitätz ur kraftinduzierten Materialschädigung sowie den Ereignissen auf molekularer Ebene wird durchi ntrinsische Beschränkungen der Fluoreszenzdetektionstechniken erschwert. Hier begegnen wir dieser Herausforderung, indem wir das erste Belastungssonden-Motiv entwickeln, das auf der Hochkonversion von Photonen beruht. Durchd ie Kombination des Diels-Alder-Adduktes eines p-ausgedehnten Anthracens mit dem Porphyrin-basierten Triplett-Sensibilisator PtOEP in Polymeren kçnnen wir die Hochkonversion durch Triplett-Triplett-Annihilierung von grünem zu blauem Licht sowohli nL çsung als auch im festen Zustand mechanisch aktivieren. Wirsind zuversichtlich, dass dieser Ansatz den Weg zur quantitativen Anti-Stokes-Belastungsanzeige fürU V-intransparente Materialien ebnet.

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Photophysical characterization of the 9,10-disubstituted anthracene chromophore and its applications in triplet–triplet annihilation photon upconversion

Abstract: Eight 9,10-disubstituted anthracenes have been synthesized, photochemically characterized and used for triplet–triplet annihilation photon upconversion.

Cited by 129 publications

References 81 publications

Employing Core‐Shell Quantum Dots as Triplet Sensitizers for Photon Upconversion

Employing Core‐Shell Quantum Dots as Triplet Sensitizers for Photon Upconversion

Photon upconversion with directed emission

Anti‐Stokes‐Belastungsanzeige: Mechanochemische Aktivierung der Triplett‐Triplett‐Annihilierung‐Photonen‐Hochkonversion

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