An ambipolar phosphine oxide-based host for high power efficiency blue phosphorescent organic light emitting devices

Journal Article · Mon Jun 01 04:00:00 EDT 2009 · Applied Physics Letters, 94(22):Art. No. 223304

DOI:https://doi.org/10.1063/1.3148642· OSTI ID:963829

Polikarpov, Evgueni; Swensen, James S; Chopra, Neetu; So, Franky; Padmaperuma, Asanga B

We report blue electrophosphorescent organic light emitting devices (OLEDs) with a new ambipolar host material, 4-(diphenylphosphoryl)-N,N-diphenylaniline (HM-A1), doped with the blue phosphor iridium (III) bis[(4,6-difluorophenyl)-pyridinato-N,C2’]picolinate (FIrpic). The ambipolar nature of the host was verified using single carrier devices. The power efficiency of devices that employed 2,8-bis(diphenylphosphoryl)dibenzothiophene (PO15) as the electron transport layer showed optimized device performance when the electron transport layer thickness was 500 Å, giving a peak power efficiency of 46 lm/W (corresponding external quantum efficiency of 17.1%). The external quantum efficiency and power efficiency at the brightness of 800 Cd/m2 were measured with no light outcoupling enhancement and found to be 15.4% and 26 lm/W, respectively.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 963829
• Report Number(s): PNNL-SA-65259; 830403000
• Journal Information: Applied Physics Letters, 94(22):Art. No. 223304, Journal Name: Applied Physics Letters, 94(22):Art. No. 223304 Journal Issue: 22 Vol. 94; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ELECTRON TRANSFER
IRIDIUM COMPLEXES
LIGHT EMITTING DIODES
PERFORMANCE
PHOSPHINE OXIDES
PHOSPHORS
QUANTUM EFFICIENCY
SUBSTRATES