Facially Coordinated, <i>Tris</i> ‐bidentate Purin‐8‐ylidene Ir(III) Complexes for Blue Electrophosphorescence and Hyperluminescence

Abstract Homoleptic fac ‐substituted Ir(III) carbene complexes exhibit higher emission energy (in purple region) in comparison to their mer ‐counterparts, prohibiting them be employed fabrication of blue emissive organic light‐emitting diode (OLED) devices. Now, the design two distinctive CF 3 ‐functionalized purin‐8‐ylidene complexes, namely, m ‐ and f ‐CF ‐PhCF , from new motifs, 9‐(3‐( tert ‐butyl)phenyl)‐7‐isopropyl‐2‐(trifluoromethyl)‐7,9‐dihydro‐8 H ‐purin‐8‐ylidene ( A4 ) ‐butyl)phenyl)‐7‐methyl‐6‐phenyl‐2‐(trifluoromethyl)‐7,9‐dihydro‐8 B7 ), having notably stabilized lowest unoccupied molecular orbital levels is reported. Hence, corresponding ‐isomers electroluminescence with peak max. at 478 495 nm, external quantum efficiencies (EQEs) 10.4% 12.8%, respectively. By using as assistant dopant convey its terminal emitter t ‐DABNA donor 2TCzBN acceptor, hyper‐OLED devices are successfully fabricated, giving high EQE 23.8%, full‐width half‐maximum (FWHM) 30 CIE x y coordinate (0.13, 0.14) for acceptor ‐DABNA, 24.0%, FWHM 28 (0.11, 0.36) 2TCzBN, confirming advantages these complexes.