Triplet–Triplet Annihilation Upconversion in a MOF with Acceptor‐Filled Channels

Gharaati, Shadab; Wang, Cui; Förster, Christoph; Weigert, Florian; Resch‐Genger, Ute; Heinze, Katja

doi:10.1002/chem.201904945

Cited by 34 publications

(34 citation statements)

References 57 publications

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“…At higher P,s ensitizer saturation slowly occurs as indicated by ap hotonic order below 2w hich eventually approaches 1a si stypical for ao ne-photon process (slope or photonic order of 1.05). [21]…”

Section: Resultsmentioning

confidence: 99%

Near‐IR to Near‐IR Upconversion Luminescence in Molecular Chromium Ytterbium Salts

et al. 2020

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Upconversion photoluminescence in hetero-oligonuclear metal complex architectures featuring organic ligands is an interesting but still rarely observed phenomenon, despite its great potential from ab asic researcha nd application perspective.Inthis context, anew photonic material consisting of molecular chromium(III) and ytterbium(III) complex ions was developed that exhibits excitation-power density-dependent cooperative sensitization of the chromium-centered 2 E/ 2 T 1 phosphorescence at approximately 775 nm after excitation of the ytterbium band 2 F 7/2 ! 2 F 5/2 at approximately 980 nm in the solid state at ambient temperature.The upconversion process is insensitive to atmospheric oxygen and can be observed in the presence of water molecules in the crystal lattice.

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Section: Resultsmentioning

confidence: 99%

Near‐IR to Near‐IR Upconversion Luminescence in Molecular Chromium Ytterbium Salts

et al. 2020

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“…Triplet energy migration‐based photon upconversion has been realized in condensed amorphous systems, [ 12 ] ordered self‐assembled structures in liquid, [ 13 ] gels, [ 1e,14 ] molecular crystals, [ 15 ] and MOFs [ 16 ] with various reviews written about this topic. [ 3 ] In most of these approaches, the annihilator is functionalized with side‐chains or ionic groups.…”

Section: Methodsmentioning

confidence: 99%

“…[5a,9] TTA-UC utilizing aligned chromophores for fast exciton diffusion, known as triplet energy migration-based upconversion (TEM-UC), has the potential to outperform rigid systems [1c,3a,c] where molecular diffusion is inherently low as in polymers (e.g., poly(methyl methacrylate)) [5a,10] and organic glasses. [11] Triplet energy migration-based photon upconversion has been realized in condensed amorphous systems, [12] ordered selfassembled structures in liquid, [13] gels, [1e,14] molecular crystals, [15] and MOFs [16] with various reviews written about this topic. [3] In most of these approaches, the annihilator is functionalized with side-chains or ionic groups.…”

Section: Doi: 101002/adma202004775mentioning

confidence: 99%

Highly Ordered 2D‐Assemblies of Phase‐Segregated Block Molecules for Upconverted Linearly Polarized Emission

et al. 2020

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Materials based on the laminar ordering of self‐assembled molecules have a unique potential for applications requiring efficient energy migration through densely packed chromophores. Here, employing molecular assemblies of coil–rod–coil block molecules for triplet–triplet annihilation upconversion (TTA‐UC) based on triplet energy migration with linearly polarized emission is reported. By covalently attaching discrete‐length oligodimethylsiloxane (oDMS) to 9,10‐diphenylanthracene (DPA), highly ordered 2D crystalline DPA sheets separated by oDMS layers are obtained. Transparent films of this material doped with small amounts of triplet sensitizer PtII octaethylporphyrin show air‐stable TTA‐UC under non‐coherent excitation. Upon annealing, an increase in TTA‐UC up to two orders of magnitude is observed originating from both an improved molecular ordering of DPA and an increased dispersion of the sensitizer. The molecular alignment in millimeter‐sized domains leads to upconverted linearly polarized emission without alignment layers. By using a novel technique, upconversion imaging microscopy, the TTA‐UC intensity is spatially resolved on a micrometer scale to visually demonstrate the importance of molecular dispersion of sensitizer molecules for efficient TTA‐UC. The reported results are promising for anti‐counterfeiting and 3D night‐vision applications, but also exemplify the potential of discrete oligodimethylsiloxane functionalized chromophores for highly aligned and densely packed molecular materials.

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“…Bei hçheren Werten für P tritt nach und nach eine Sättigung der Sensi-bilisatoren auf,w elche eine photonische Ordnung kleiner 2 bewirkt, bevor sich die photonische Ordnung schließlich einem Wert von 1nähert, was füreinen Einphotonen-Prozess charakteristisch ist (Steigung oder photonische Ordnung von 1.05). [21] Zusammenfassung Durch sorgfältige Überarbeitung des Designs früherer Downshifting-Cr 3+ /Yb 3+ -Systeme konnten wir durch einfaches Kombinieren von Cr 3+ -u nd Yb 3+ -Komplexen in einem ionischen Festkçrper ein neues NIR!NIR-Aufkonvertierungsmaterial realisieren. Dies erweitert die kleine Zahl an bekannten molekularen UC-Beispielen um ein neues Sensibilisator/Aktivator-Metallkomplexpaar.…”

Section: Angewandte Chemieunclassified

NIR‐NIR‐Aufkonvertierung in molekularen Chrom‐Ytterbium‐Salzen

et al. 2020

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Photonen-Aufkonvertierung in hetero-oligonuklearen, Metallkomplex-Architekturen mit organischen Liganden ist ein interessantes,aber bisher selten beobachtetes Phänomen, trotz des großen Potentials sowohl aus Sicht der Grundlagenforschung als auch aus der Anwendungsperspektive.N un wurde ein neues photonisches Material aus molekularen Chrom(III)-und Ytterbium(III)-Komplexionen entwickelt. Dieses zeigt im Festkçrper bei Raumtemperatur abhängig von der Anregungsleistungsdichte nachA nregung des 2 F 7/2 ! 2 F 5/2-Überganges des Ytterbiums bei ca. 980 nm eine kooperative Sensibilisierung der Chrom(III)-zentrierten 2 E/ 2 T 1-Phosphoreszenzb ei ca. 775 nm. Der Aufkonvertierungsprozess ist unempfindlichg egenüber Luftsauerstoff und kann in Gegenwart von Wassermolekülen im Kristallgitter beobachtet werden.

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Triplet–Triplet Annihilation Upconversion in a MOF with Acceptor‐Filled Channels

Cited by 34 publications

References 57 publications

Near‐IR to Near‐IR Upconversion Luminescence in Molecular Chromium Ytterbium Salts

Near‐IR to Near‐IR Upconversion Luminescence in Molecular Chromium Ytterbium Salts

Highly Ordered 2D‐Assemblies of Phase‐Segregated Block Molecules for Upconverted Linearly Polarized Emission

NIR‐NIR‐Aufkonvertierung in molekularen Chrom‐Ytterbium‐Salzen

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