2017/04/21 by Caterin Salas Redondo, Paul Kleine, Karla Roszeitis +4 · 60 citations
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Annihilation #Atomic physics #Chemical physics #Chemistry #Condensed matter physics #Excitation #Excited state #Exciton #Fluorescence #Luminescence and Fluorescent Materials #Materials science #Molecular physics #Optics #Organic Light-Emitting Diodes Research #Perovskite Materials and Applications #Phosphorescence #Photochemistry #Physics #Quenching (fluorescence) #Singlet state #Triplet state #physics.app-ph #physics.chem-ph
paper · pdf · open access · doi:10.1021/acs.jpcc.7b04529
published in The Journal of Physical Chemistry C 121(27), 14946-14953 (American Chemical Society) · 45 pages, 10 figures (main manuscript and supplementary information)
arxiv created 2017/04/21 · openalex created_date 2017/05/05 · openalex publication_date 2017/06/21 · arxiv updated 2019/06/07 · openalex updated_date 2026/08/05
High Resolution Image Download MS PowerPoint Slide Biluminescent organic emitters show simultaneous fluorescence and phosphorescence at room temperature. So far, the optimization of the room-temperature phosphorescence in these materials has drawn the attention of research. However, the continuous-wave operation of these emitters will consequently turn them into systems with vastly imbalanced singlet and triplet populations, which is due to the respective excited-state lifetimes. This study reports on the exciton dynamics of the biluminophore NPB ( N, N ′-di(1-naphthyl)- N, N ′-diphenyl-(1,1-biphenyl)-4,4-diamine). In the extreme case, the singlet and triplet exciton lifetimes stretch from 3 ns to 300 ms, respectively. Through sample engineering and oxygen quenching experiments, the triplet exciton density can be controlled over several orders of magnitude, allowing us to study exciton interactions between singlet and triplet manifolds. The results show that singlet–triplet annihilation reduces the overall biluminescence efficiency already at moderate excitation levels. Additionally, the presented system represents an illustrative role model to study excitonic effects in organic materials.