Near‐IR Emitting Iridium(III) Complexes with Heteroaromatic β‐Diketonate Ancillary Ligands for Efficient Solution‐Processed OLEDs: Structure–Property Correlations |
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| Authors: | Dr Sagar Kesarkar Dr Wojciech Mróz Dr Marta Penconi Dr Mariacecilia Pasini Dr Silvia Destri Dr Marco Cazzaniga Dr Davide Ceresoli Prof Patrizia R Mussini Dr Clara Baldoli Dr Umberto Giovanella Dr Alberto Bossi |
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| Affiliation: | 1. Istituto di Scienze e Tecnologie Molecolari–, CNR and SmartMatLab Center, Milano, Italy;2. Istituto per lo Studio delle Macromolecole–, CNR, Milano, Italy;3. Dipartimento di Chimica, Università degli Studi di Milano, Milano, Italy |
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| 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‐(benzob]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. |
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| Keywords: | density functional calculations electrochemistry iridium organic light emitting diodes phosphorescence |
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