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RESEARCH PRODUCT
Triplet–Triplet Annihilation Upconversion in a MOF with Acceptor‐Filled Channels
Christoph FörsterShadab GharaatiCui WangCui WangUte Resch-gengerFlorian WeigertKatja Heinzesubject
LuminescenceQuantum yieldengineering.material010402 general chemistryPhotochemistryporphyrins01 natural sciencesCatalysismetal–organic frameworksCoatinghybrid materialsupconversion010405 organic chemistryChemistryCommunicationOrganic ChemistryGeneral ChemistryAcceptorFluorescencePhoton upconversionCommunicationstriplet–triplet annihilation0104 chemical sciencesengineeringMetal-organic frameworkLuminescenceHybrid materialdescription
Abstract Photon upconversion has enjoyed increased interest in the last years due to its high potential for solar‐energy harvesting and bioimaging. A challenge for triplet–triplet annihilation upconversion (TTA‐UC) processes is to realize these features in solid materials without undesired phase segregation and detrimental dye aggregation. To achieve this, we combine a palladium porphyrin sensitizer and a 9,10‐diphenylanthracene annihilator within a crystalline mesoporous metal–organic framework using an inverted design. In this modular TTA system, the framework walls constitute the fixed sensitizer, while caprylic acid coats the channels providing a solventlike environment for the mobile annihilator in the channels. The resulting solid material shows green‐to‐blue delayed upconverted emission with a luminescence lifetime of 373±5 μs, a threshold value of 329 mW cm−2 and a triplet–triplet energy transfer efficiency of 82 %. The versatile design allows straightforward changing of the acceptor amount and type.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-12-03 | Chemistry (Weinheim an Der Bergstrasse, Germany) |