Upper limit to the ultimate achievable emission wavelength in near-IR emitting cyclometalated iridium complexes
| Autor: | Alberto Bossi, Patrizia R. Mussini, Davide Ceresoli, Marco Cazzaniga, Marta Penconi, Sagar Kesarkar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_element
02 engineering and technology 010402 general chemistry Photochemistry 01 natural sciences DFT Metal chemistry.chemical_compound OLED Iridium Physical and Theoretical Chemistry Homoleptic photophysics Iridium complexes photochemistry Ligand Time-dependent density functional theory 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Organometallic chemistry electrochemistry visual_art Yield (chemistry) DFT-TDDFT visual_art.visual_art_medium Near-IR emitteres 0210 nano-technology Phosphorescence |
| Zdroj: | Photochemical & photobiological sciences 16 (2017): 1220–1229. doi:10.1039/c7pp00119c info:cnr-pdr/source/autori:Penconi, Marta; Cazzaniga, Marco; Kesarkar, Sagar; Mussini, Patrizia R.; Ceresoli, Davide; Bossi, Alberto/titolo:Upper limit to the ultimate achievable emission wavelength in near-IR emitting cyclometalated iridium complexes/doi:10.1039%2Fc7pp00119c/rivista:Photochemical & photobiological sciences (Print)/anno:2017/pagina_da:1220/pagina_a:1229/intervallo_pagine:1220–1229/volume:16 Photochemical & photobiological sciences (Online) (2017). doi:10.1039/C7PP00119C info:cnr-pdr/source/autori:Penconi Marta, Cazzaniga Marco, Kesarkar Sagar, Mussini Patrizia Romana, Ceresoli Davide, Bossi Alberto/titolo:Upper limit to the ultimate achievable emission wavelength in Near-IR emitting cyclometalated Iridium complexes/doi:10.1039%2FC7PP00119C/rivista:Photochemical & photobiological sciences (Online)/anno:2017/pagina_da:/pagina_a:/intervallo_pagine:/volume |
| DOI: | 10.1039/c7pp00119c |
| Popis: | Iridium complexes bearing cyclometalated (CN) ligands are the current emitters of choice for efficient phosphorescent organic light emitting diodes (OLEDs). Homoleptic iridium complexes Ir(CN)(3) and the analogous heteroleptic ones carrying a beta-diketonate ancillary ligand (CN)(2)Ir(OO) often exhibit similar photophysical properties and device performances; the choice among them usually depends both on the yield/ease of the respective synthetic preparations as well as on the device fabrication methods (i.e. vacuum-deposition or solution-process). In our recent study we found a significant spectral red shift on going from the homoleptic to the beta-diketonate Ir(III) derivatives. The NIR emitting complex Ir(iqbt)(2)dpm (lambda(max) = 710 nm) has almost 20 nm red shifted emission compared to the homologue Ir(iqbt) 3 making only the former a real NIR emitter. For comparison, we studied the Pt(iqbt) dpm complex as the suitable example to investigate metal ligand interactions. Noteworthily the Pt(iqbt) dpm emission perfectly overlaps that of the Ir(iqbt) 2dpm. In this paper we provide an in-depth investigation of these systems by electro-chemical and spectroscopic analyses and corroborate the results with DFT and TDDFT calculations to investigate whether the Pt(II) complex can be used as a model system to predict how far the emission can be pushed in a Ir(III) heteroleptic derivative bearing the same CN ligand. |
| Databáze: | OpenAIRE |
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