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- Title
Near-IR Emitting Iridium(III) Complexes with Heteroaromatic β-Diketonate Ancillary Ligands for Efficient Solution-Processed OLEDs: Structure-Property Correlations.
- Authors
Kesarkar, Sagar; Mróz, Wojciech; Penconi, Marta; Pasini, Mariacecilia; Destri, Silvia; Cazzaniga, Marco; Ceresoli, Davide; Mussini, Patrizia R.; Baldoli, Clara; Giovanella, Umberto; Bossi, Alberto
- Abstract
Three NIR-emitting neutral IrIII complexes [Ir(iqbt)2(dpm)] ( 1), [Ir(iqbt)2(tta)] ( 2), and [Ir(iqbt)2(dtdk)] ( 3) based on the 1-(benzo[b]thiophen-2-yl)-isoquinolinate (iqtb) were synthesized and characterized (dpm=2,2,6,6-tetramethyl-3,5-heptanedionate; tta=2-thienoyltrifluoroacetonate; dtdk=1,3-di(thiophen-2-yl)propane-1,3-dionate). The compounds emit between λ=680 and 850 nm with high luminescence quantum yields (up to 16 %). By combining electrochemistry, photophysical measurements, and computational modelling, the relationship between the structure, energy levels, and properties were investigated. NIR-emitting, solution-processed phosphorescent organic light-emitting devices (PHOLEDs) were fabricated using the complexes. The devices show remarkable external quantum efficiencies (above 3 % with 1) with negligible efficiency roll-off values, exceeding the highest reported values for solution-processible NIR emitters.
- Subjects
ORGANIC light emitting diodes; TETRAMETHYL compounds; LUMINESCENCE; ELECTROCHEMISTRY; QUANTUM efficiency
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 8, p2714
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201509798