The introduction of pyrrolic nitrogen dopants {into the|in to the} central {sites|websites|web sites|internet sites|web-sites|web pages} of polycyclic aromatic hydrocarbons (PAHs) {often|frequently|usually|typically|generally|normally} {gives|provides|offers} rise to characteristic bowl-shaped structures {due to|because of|as a result of|on account of|resulting from|as a consequence of} the simultaneous introduction of 5- and/or 7-membered cycles. {Although|Even though|Though|Despite the fact that|While} the incorporation {of these|of those} heteroatoms achieves {excellent|superb|outstanding|exceptional|great|fantastic} electron-donating {ability|capability|capacity|potential}, the application of this strat-egy for the {design|style|design and style} of optoelectronics is hampered by {typically|usually|normally|generally|commonly|ordinarily} low photoluminescence quantum yields (PLQYs). {In order to|To be able to|As a way to|In an effort to|So as to|So that you can} address this {issue|problem|concern|situation|challenge}, {in the|within the|inside the} present study we report the synthesis and characterization {of the|from the|in the|on the|with the|of your} {first|initial|very first|1st|initially} curved and {fully|totally|completely} conju-gated nitrogen-doped PAHs in which an electronically diverse phenazine terminus serves {as the|because the} electron-accepting moie-ty. We show that the curvature {of the|from the|in the|on the|with the|of your} molecular skeleton increases the spatial separation {between|in between|among|amongst|involving} the HOMO {and the|and also the|as well as the|along with the|plus the} LUMO, {leading|top|major} to low singlet-triplet gaps, {which are|that are} {essential|important|crucial|vital|necessary|critical} for {high|higher} reverse intersystem crossing (RISC) {rates|prices}. Moreo-ver, we evaluate the utility {of the|from the|in the|on the|with the|of your} concave N-doped systems as TADF/RTP emitters, which has not been explored so far {in the|within the|inside the} context of non-planar N-PAHs. By varying the electron-accepting {ability|capability|capacity|potential} {of the|from the|in the|on the|with the|of your} phenazine terminus, {we are|we’re} {able|in a position|capable} to tune the PLQY {of the|from the|in the|on the|with the|of your} {given|offered|provided} compounds {in a|inside a|within a} {range|variety} from 9% to 86% ({for a|to get a|for any} dinitrile substituted derivative). As a proof of con-cept, we constructed solid-state OLED devices exhibiting yellow to orange emission. The best-performing compound, {built|constructed} from a 3-(trifluoromethyl)phenyl decorated phenazine acceptor, shows a maximum external EL quantum efficiency (EQE) of 12%, {which is|that is|which can be} the highest EQE in an curved D-A embedded N-PAH to date2-Aminoacetamide structure 6-Bromo-5-fluoronicotinaldehyde web PMID:23008002
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