A Novel, Bipolar Polymeric Host for Highly Efficient Blue Electrophosphorescence: a Non‐Conjugated Poly(aryl ether) Containing Triphenylphosphine Oxide Units in the Electron‐Transporting Main Chain and Carbazole Units in Hole‐Transporting Side Chains

Carbazole-based polymers as hosts for solution-processed organic light-emitting diodes: Simplicity, efficacy

“…In this field, a relevant example is P54 in which electron-transporting triphenylphosphine oxide units have been introduced in the main chain [58]. To retain the high triplet energy of carbazole, poly(aryl ether) was selected to form the polymer backbone as the presence of oxygen atoms in the main chain interrupts the p-conjugation.…”

“…However, availability of suitable polymeric hosts for blue phosphorescent dopants is still lagging far behind that of the other colors [53][54][55]. Recently, several examples of wide bandgap polymeric hosts based on a p-conjugated interrupted polymer backbone were developed [56][57][58][59]. Indeed, one major drawback of the conjugated main-chain polymers is their low bandgaps resulting from the p-electron delocalization along the polymer backbone.…”

Solution-processed blue phosphorescent OLEDs with carbazole-based polymeric host materials

“…Recently, several carbazole-based polymeric hosts that could advantageously replace PVK were reported. Notably, a polymer with a triplet energy level at 2.96 eV [49] could successfully host the well-known blue dopant iridium(III) [bis(4,6-difluoro-phenyl)pyridinato-N,C 2 ]picolinate FIrpic [50]. A maximum current efficiency (CE) of 23.3 cd/A could be obtained with the double-layered PLEDs.…”

Produktion und Charakterisierung von mikrostrukturierten Calcitpartikeln aus der Kalkalge Emiliania huxleyi

“…Further enhancement is expected by device optimization. Some other promising polymers include a poly( m ‐phenylene) derivative with a tethering carbazole unit (PmPCz; E T =2.64 eV),49 and a poly(aryl ether) derivative (PCzPO;50 E T =2.96 eV; see Figure 6) as a bipolar polymeric host for all‐phosphor solution‐processed WOLEDs.…”