Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster 1
CPP 12.77: Poster
Montag, 5. September 2022, 18:00–20:00, P1
Photoluminescence and Quantum Yield of a deep blue TADF emitter — •Mona Löther, Fabian Binder, Pascal Schady, Jeannine Grüne, Vladimir Dyakonov, and Andreas Sperlich — Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg
Organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) are becoming increasingly important due to their advantages over OLEDs of earlier generations as they enable access to triplet excitons via reverse intersystem crossing (rISC) without the need of resources-limited rare metal complexes. However, TADF OLEDs have yet to reach commercial viability, as an efficient and durable blue OLED remains to be found. A promising design for a blue host-dopant system is N7,N7,N13,N13,5,9,11,15-octaphenyl-5,9,11,15-tetrahydro-5, 9,11,15-tetraaza-19b, 20b diboradinaphtho[3,2,1-de:10, 20, 30-jk]pent-acene-7,13-diaminel (ν-DABNA). This system belongs to the multiresonant TADF compounds, represented typically by narrow band emission, high photoluminescence quantum yield (PLQY) and a small singlet-triplet gap Δ EST. In order to characterize its optical properties we examined the steady state photoluminescence (PL), transient photoluminescence (trPL) and PLQY. Furthermore, we used different host systems to survey the behavior of ν-DABNA in a host-emitter system. With these optical characterization methods we are able to better understand the promising candidate of TADF OLEDs with high efficiencies and color purity.