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Modulation of the Physicochemical Properties of Donor–Spiro–Acceptor Derivatives through Donor Unit Planarisation: Phenylacridine versus Indoloacridine—New Hosts for Green and Blue Phosphorescent Organic Light‐Emitting Diodes (PhOLEDs)
Authors:Dr. Sébastien Thiery  Dr. Denis Tondelier  Bernard Geffroy  Dr. Olivier Jeannin  Dr. Joëlle Rault‐Berthelot  Dr. Cyril Poriel
Affiliation:1. UMR CNRS 6226 “Institut des Sciences Chimiques de Rennes”, Université de Rennes 1-Campus de Beaulieu, Rennes Cedex, France;2. LPCIM, CNRS, école Polytechnique, Université Paris-Saclay, Palaiseau, France;3. LICSEN, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif Sur Yvette, France
Abstract:This work reports a detailed structure–property relationship study of a series of efficient host materials based on the donor–spiro–acceptor (D‐spiro‐A) design for green and sky‐blue phosphorescent organic light‐emitting diodes (PhOLEDs). The electronic and physical effects of the indoloacridine (IA) fragment connected through a spiro bridge to different acceptor units, namely, fluorene, dioxothioxanthene or diazafluorene moiety, have been investigated in depth. The resulting host materials have been easily synthesised through short, efficient, low‐cost, and highly adaptable synthetic routes by using common intermediates. The dyes possess a very high triplet energy (ET) and tuneable HOMO/LUMO levels, depending on the strength of the donor/acceptor combination. The peculiar electrochemical and optical properties of the IA moiety have been investigated though a fine comparison with their phenylacridine counterparts to study the influence of planarisation. Finally, these molecules have been incorporated as hosts in green and sky‐blue PhOLEDs. For the derivative SIA‐TXO2 as a host, external quantum efficiencies as high as 23 and 14 % have been obtained for green and sky‐blue PhOLEDs, respectively.
Keywords:donor–  acceptor systems  electrochemistry  luminescence  spiro compounds  structure–  activity relationships
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