Bi- or ter-pyridine tris-substituted benzenes as electron-transporting materials for organic light-emitting devices

Benzene substituted with bipyridine and terpyridine as electron-transporting materials for organic light-emitting devices

“…The geometry can be understood as that in which a pyridyl group is deleted from the optimized geometry of tris(terpyridine)-substituted benzene with C3 symmetry. 30 However, the geometry can be easily converted to others, as shown in Fig. 4b, by rotating bi-or ter-pyridine wings around the single bond connecting the wing with the central phenyl ring.…”

“…This mixing probably also results in the material being amorphous, similar to the symmetrical tris bi-or ter-pyridyl benzenes reported before. 30 However, four geometries contribute to the amorphous nature of BBTB and BTBB, while two geometries contribute in the case of the tris-substituted analogues.…”

“…30 BBTB and BTBB were purified by column chromatography and temperature-gradient sublimation in a flow stream of pure Ar gas. Chemical structures were confirmed by 1 H NMR, 13 C NMR, and mass spectroscopy.…”

Crystal structure and photoluminescent properties of bis(4′-chloro-2,2′:6′,2′′-terpyridyl)cobalt(II) dichloride tetrahydrate

“…As 2,2 0 -bipyridine (bpy) is reported to show both -donor and -acceptor capabilities, disubstituted 4,4 0 -, 5,5 0 -and 6,6 0derivatives of bpy have been widely employed in supramolecular and coordination chemistry (Kaes et al, 2000;Williams et al, 2002). Materials incorporating pyridine have also been shown to perform well in electron-transporting layers in OLEDs because of their high electron mobility (Ichikawa et al, 2010).…”

Chemical structure dependent electron transport in 9,10-bis(2-phenyl-1,3,4-oxadiazole) derivatives of anthracene

“…have been synthesized and used as electron transport materials. [30][31][32][33][34][35][36][37][38][39] Molecules containing oxadiazole moieties have been found to possess attracting electron transport properties. [40][41][42] PBD is an oxadiazole molecule, which has been widely used as electron transport material.…”