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https://hdl.handle.net/20.500.14279/10092
Τίτλος: | All-solution-based aggregation control in solid-state photon upconverting organic model composites | Συγγραφείς: | Goudarzi, Hossein Keivanidis, Panagiotis E. |
Major Field of Science: | Engineering and Technology | Field Category: | Mechanical Engineering | Λέξεις-κλειδιά: | Energy migration;Exciton hopping;Phosphorescence;Photon upconversion;Sensitization;Triplet fusion | Ημερομηνία Έκδοσης: | 1-Ιαν-2017 | Πηγή: | ACS Applied Materials and Interfaces, 2017, vol. 9, no. 1, pp. 845-857 | Volume: | 9 | Issue: | 1 | Start page: | 845 | End page: | 857 | Περιοδικό: | ACS Applied Materials & Interfaces | Περίληψη: | Hitherto, great strides have been made in the development of organic systems that exhibit triplet-triplet annihilation-induced photonenergy upconversion (TTA-UC). Yet, the exact role of intermolecular states in solid-state TTA-UC composites remains elusive. Here we perform a comprehensive spectroscopic study in a series of solution-processable solidstate TTA-UC organic composites with increasing segregated phase content for elucidating the impact of aggregate formation in their TTA-UC properties. Six different states of aggregation are reached in composites of the 9,10-diphenylanthracene (DPA) blue emitter mixed with the (2,3,7,8,12,13,17,18-octaethylporphyrinato)platinum(II) sensitizer (PtOEP) in a fixed nominal ratio (2 wt % PtOEP). Fine-tuning of the PtOEP and DPA phase segregation in these composites is achieved with a lowtemperature solution-processing protocol when three different solvents of increasing boiling point are alternatively used and when the binary DPA:PtOEP system is dispersed in the optically inert polystyrene (PS) matrix (PS:DPA:PtOEP). Time-gated (in the nanosecond and microsecond time scales) photoluminescence measurements identify the upper level of PtOEP segregation at which the PtOEP aggregate-based networks favor PtOEP triplet exciton migration toward the PtOEP:DPA interfaces and triplet energy transfer to the DPA triplet manifold. The maximum DPA TTA-UC luminescence intensity is ensured when the bimolecular annihilation constant of PtOEP remains close to γTTA-PtOEP = 1.1 × 10-13 cm3 s-1. Beyond this PtOEP segregation level, the DPA TTA-UC luminescence intensity decreases because of losses caused by the generation of PtOEP delayed fluorescence and DPA phosphorescence in the nanosecond and microsecond time scales, respectively. | URI: | https://hdl.handle.net/20.500.14279/10092 | ISSN: | 19448252 | DOI: | 10.1021/acsami.6b12704 | Rights: | © American Chemical Society | Type: | Article | Affiliation: | Fondazione Istituto Italiano di Tecnologia Cyprus University of Technology |
Publication Type: | Peer Reviewed |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
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