Triplet–triplet annihilation upconversion from rationally designed polymeric emitters with tunable inter-chromophore distances

Yu, Xinjun; Chen, Xian; Chen, Xiaoping; Ayres, Neil; Zhang, Peng

doi:10.1039/c4cc07589g

Cited by 53 publications

(45 citation statements)

References 19 publications

(27 reference statements)

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“…[174] Zhang and coworkers also recently showed that the spatial distribution of emitters critically influenced the UC efficiency in poly(9-anthrylmethyl methacrylate) emitter copolymers doped with PtOEP as a sensitizer. [175] For most luminophores, emission is typically isotropic; however there are a number of advantages for directed emission as discussed above in relation to LSCs. Börjesson et al recently used liquid crystals to achieve anisotropic UC emission.…”

Section: Duan Et Al Observed Tta In Nn-bis(octadecyl)-l-boc-glutamimentioning

confidence: 99%

Towards Efficient Spectral Converters through Materials Design for Luminescent Solar Devices

2017

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Single-junction photovoltaic devices exhibit a bottleneck in their efficiency due to incomplete or inefficient harvesting of photons in the low- or high-energy regions of the solar spectrum. Spectral converters can be used to convert solar photons into energies that are more effectively captured by the photovoltaic device through a photoluminescence process. Here, recent advances in the fields of luminescent solar concentration, luminescent downshifting, and upconversion are discussed. The focus is specifically on the role that materials science has to play in overcoming barriers in the optical performance in all spectral converters and on their successful integration with both established (e.g., c-Si, GaAs) and emerging (perovskite, organic, dye-sensitized) cell types. Current challenges and emerging research directions, which need to be addressed for the development of next-generation luminescent solar devices, are also discussed.

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Section: Duan Et Al Observed Tta In Nn-bis(octadecyl)-l-boc-glutamimentioning

confidence: 99%

Towards Efficient Spectral Converters through Materials Design for Luminescent Solar Devices

2017

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“…Leichte Tr ennbarkeit, hçhere thermochemische Stabilitätu nd mçgliche Anwendung im großen Maßstab machen Festkçrpersensibilisatoren attraktiver als homogene Analoga. p-konjugierte Tr iplett-Sensibilisatorenw aren in den vergangenen Jahrzehnten Gegenstand der Forschung und wurden recht erfolgreich bei der Lichtenergieumwandlung eingesetzt, beispielsweise bei der Herstellung von LEDs, [31,32] zur Umwandlung von Photonen bei der Hochkonversion, [33][34][35] der Bildgebung von Zellen [36] usw.E ss ind jedoch nur wenige Beispiele fürd en Einsatz solcher Materialien in der Photokatalyse bekannt. [37] Bemerkenswert ist, dass ihre Verwendung auf "Modell"-Reaktionen beschränkt wurde.…”

Section: Introductionunclassified

Kalium‐Polyheptazinimid: Ein übergangsmetallfreier Festkörper‐Triplett‐Sensibilisator in Kaskadenenergietransfer und [3+2]‐Cycloadditionen

et al. 2020

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Polymere Kohlenstoffnitridmaterialien wurden erfolgreich in zahlreichen Anwendungen zur Umwandlung von Licht in Energie, die von der Photokatalyse bis zur Optoelektronik reichen, eingesetzt. Für eine neue Anwendung und Modellierung verfeinerten wir zunächst die Kristallstruktur von Kalium‐Polyheptazinimid (K‐PHI) – einem Referenz‐Kohlenstoffnitridmaterial in der Photokatalyse – mithilfe von Röntgenpulverdiffraktometrie und Transmissionselektronenmikroskopie. Unter Verwendung der Kristallstruktur von K‐PHI wurden periodische DFT‐Berechnungen durchgeführt, um die Zustandsdichte zu berechnen und Intra‐Banden‐Zustände (IBS) zu lokalisieren. Es wurde festgestellt, dass IBS für die erhöhte Absorption von K‐PHI im nahen IR‐Bereich verantwortlich sind, als Elektronenfallen dienen und bei Energietransferreaktionen nützlich sind. Einmal mit sichtbarem Licht angeregt, können Kohlenstoffnitride neben der direkten Rekombination auch Intersystem Crossing vom Singulett‐ in den Triplett‐Zustand durchlaufen. Wir nutzen die angeregten zentrierten Triplett‐Zustände im K‐PHI, um eine Kaskade von Energieübertragungsreaktionen auszulösen und im Gegenzug z. B. Singulett‐Sauerstoff (1O2), als Ausgangspunkt für die Synthese von bis zu 25 verschiedenen N‐reichen Heterozyklen, zu sensibilisieren.

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“…This study sought to explore whether the solubility of the sensitizer molecules and electronic relaxation pathways involving aggregates of the sensitizer molecules are indeed to blame. While several groups have explored the connection of emitter and sensitizer units in polymers, little has been done in the context of understanding how it impacted thick polymeric films. We therefore prepared and studied glassy terpolymers in which both the sensitizer and the emitter are covalently connected to a polymeric backbone as pendant groups.…”

Section: Introductionmentioning

confidence: 99%

Glassy poly(methacrylate) terpolymers with covalently attached emitters and sensitizers for low-power light upconversion

Lee

Thévenaz

Weder

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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Low‐power light upconversion by triplet–triplet annihilation (TTA‐UC) was only recently demonstrated in glassy polymers and the upconversion efficiency in these materials is typically much lower than in solution. As aggregation of the chromophores was thought to be the culprit, we here report the covalent tethering of a suitable chromophore pair to a polymeric backbone. The new materials were based on the sensitizer‐bearing monomer palladium meso‐phenoxy‐tris(heptyl)porphyrin‐ethylmethacrylate (PdmPH3PMA), which was copolymerized with a diphenylanthrancene methacrylate (DPAMA), as the emitter‐bearing monomer, and methyl methacrylate (MMA) as an optically inert comonomer. The DPA content was kept within a narrow range of 30–37 wt %, while the PdmPH3PMA content was varied between 0.73 and 0.012 wt %. To explore additional compositions, blends of a high‐porphyrin‐content terpolymer with a DPAMA‐MMA copolymer were also prepared. All of the materials studied were processed into thin films by solution‐casting and displayed blue TTA‐UC emission. The UC emission intensity was found to strongly depend on the composition and the underlying effects were investigated through a systematic study. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1629–1639

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Triplet–triplet annihilation upconversion from rationally designed polymeric emitters with tunable inter-chromophore distances

Cited by 53 publications

References 19 publications

Towards Efficient Spectral Converters through Materials Design for Luminescent Solar Devices

Towards Efficient Spectral Converters through Materials Design for Luminescent Solar Devices

Kalium‐Polyheptazinimid: Ein übergangsmetallfreier Festkörper‐Triplett‐Sensibilisator in Kaskadenenergietransfer und [3+2]‐Cycloadditionen

Glassy poly(methacrylate) terpolymers with covalently attached emitters and sensitizers for low-power light upconversion

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