Electron and Hole Transport in a Wide Bandgap Organic Phosphine Oxide for Blue Electrophosphorecsence

Journal Article · Thu Feb 28 00:00:00 EST 2008 · Applied Physics Letters, 92(8):Art. No. 083308

DOI:https://doi.org/10.1063/1.2885117· OSTI ID:926921

Cai, Xiuyu; Padmaperuma, Asanga B; Sapochak, Linda S; Vecchi, Paul A; Burrows, Paul E

We report blue phosphorescent organic light-emitting devices (OLEDs) using an ambipolar host, N-(4-diphenylphosphoryl phenyl) carbazole (MPO12), doped with iridium (III) bis[4,6-difluorophenyl)-pyridinato-N,C2´]picolinate (FIrpic). The external quantum efficiency and operating voltage is 9.1±0.1% and 4.8 V, respectively, measured at a brightness of 800 cd/m2 with no outcoupling enhancement. By varying the layer structure of the OLEDs, we show that MPO12 is capable of transporting both electrons and holes, in contrast to previous demonstrations using diphosphine oxides, which only transported electrons. The improved hole transport results in improved device efficiency.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 926921
• Report Number(s): PNNL-SA-58532; 830403000
• Journal Information: Applied Physics Letters, 92(8):Art. No. 083308, Journal Name: Applied Physics Letters, 92(8):Art. No. 083308
• Country of Publication: United States
• Language: English

Related Subjects

OLEDs
phosphorescent
MPO12
diphosphine