LAUSR

Abstract To tune excimer/aggregation emission and obtain single emissive dopants for white polymer light-emitting diodes (WPLEDs), two novel star-shaped dinuclear cyclometalated platinum (II) complexes, namely DPtF(pic)C 6 TPhC 6 D(dHCz) and DPtF(pic)C 6 TPhC 6 D(dNaCz), have been synthesized and characterized, where DPtF(pic) is dinuclear platinum (II) [(4,6-difluorophenyl)-pyridinato-N,C 2 ′](picolinate) blue-emitting phosphorescent chromophore, D(dHCz) and D(dNaCz) are blue emitting fluorescent chromophores containing carbazole or naphthalene functionalized carbazole group, respectively, TPh is p -terphenyl used as central bridging core, finally, each parts of molecular skeleton are wired through nonconjugated hexyloxy ether linkage (C 6 ). Their thermal, electrochemical and optophysical properties were primarily investigated. The device fabricated with these complexes doped into a host polyvinylcarbazole (PVK) blend with 30 wt % of an electron transport material 1,3-bis-(5-(4-( tert -butyl)phenyl)-1,3,4-oxadiazol-2-yl)benzene (OXD-7) showed near-white emission at lower dopant concentration. At 1 wt % dopant concentration, DPtF(pic)C 6 TPhC 6 D(dHCz) exhibited near-white emission with a luminous efficiency ( LE ) of 1.12 cd/A and a maximum external quantum efficiency ( EQE ) of 0.57% (Commission Internationale de I'Eclairage(CIE) chromaticity coordinates: (0.27, 0.40)) at 2.72 mA/cm 2 . At the same dopant concentration, DPtF(pic)C 6 TPhC 6 D(dNaCz) showed much tunable near-white emission with a LE of 0.99 cd/A and a EQE of 0.51% (CIE: 0.30, 0.41) at 0.87 mA/cm 2 .