Multi-responsive thermally activated delayed fluorescence materials : optical ZnCl2 sensors and efficient green to deep-red OLEDs
Date
03/03/2024Author
Grant ID
101024874
ep/l017008/1
NF171163
Keywords
Metadata
Show full item recordAbstract
Thermally activated delayed fluorescence (TADF) is an emission mechanism whereby both singlet and triplet excitons can be harvested to produce light. Significant attention is devoted to developing TADF materials for organic light-emitting diodes (OLEDs), while their use in other organic electronics applications such as sensors, has lagged. A family of TADF emitters, TPAPyAP, TPAPyBP, and TPAPyBPN containing a triphenylamine (TPA) donor and differing nitrogen-containing heterocyclic pyrazine-based acceptors is developed and systematically studied. Depending on the acceptor strength, these three compounds emit with photoluminescence maxima (λPL), of 516, 550, and 575 nm in toluene. Notably, all three compounds show a strong and selective spectral response to the presence of ZnCl2, making them the first optical TADF sensors for this analyte. It is demonstrated that these three emitters can be used in vacuum-deposited OLEDs, which show moderate efficiencies. Of note, the device with TPAPyBPN in 2,8-bis(diphenyl-phoshporyl)-dibenzo[b,d]thiophene (PPT) host emits at 657 nm and shows a maximum external quantum efficiency (EQEmax) of 12.5%. This electroluminescence is significantly red-shifted yet shows comparable efficiency compared to a device fabricated in 4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP) host (λEL = 596 nm, EQEmax = 13.6%).
Citation
Si , C , Gupta , A K , Basumatary , B , McKay , A , Cordes , D B , Slawin , A M Z , Samuel , I D W & Zysman-Colman , E 2024 , ' Multi-responsive thermally activated delayed fluorescence materials : optical ZnCl2 sensors and efficient green to deep-red OLEDs ' , Advanced Functional Materials , vol. Early View , 2315935 . https://doi.org/10.1002/adfm.202315935
Publication
Advanced Functional Materials
Status
Peer reviewed
ISSN
1616-301XType
Journal article
Description
Funding: China Scholarship Council - 201806890001; Engineering and Physical Sciences Research Council - EP/L017008/1; Horizon 2020 Framework Programme - 101024874; Royal Society - NF171163.Collections
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