Synthesis and application of pyridine-based ambipolar hosts: control of charge balance in organic light emitting devices (OLEDs) by chemical structure modification

Journal Article · Fri Nov 05 00:00:00 EDT 2010 · Organic Letters

DOI:https://doi.org/10.1021/ol102444j· OSTI ID:1028088

Koech, Phillip K; Polikarpov, Evgueni; Rainbolt, James E; Cosimbescu, Lelia; Swensen, James S; Von Ruden, Amber L; Padmaperuma, Asanga B

Pyridine-based host materials were synthesized via Grignard metathesis of bromopyridines to provide the required organometallic reagent. The isomeric hosts (4-(9H-carbazol-9-yl)phenyl)(phenyl)(pyridin-3-yl)phosphine oxide (HM-A4), (5-(9H-carbazol-9-yl)pyridin-2-yl)diphenylphosphine oxide (HM-A5), and (5-(diphenylamino)pyridin-2-yl)diphenylphosphine oxide (HM-A6), (4-(diphenylamino)phenyl)(phenyl)(pyridin-3-yl)phosphine oxide (HM-A8) have similar frontier orbital energies. Organic light emitting devices (OLEDs) fabricated using the series of the host materials demonstrate that small structural modification of the host results in significant change in charge transporting ability.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1028088
• Report Number(s): PNNL-SA-75168; 830403000; TRN: US201121%%723
• Journal Information: Organic Letters, Vol. 12, Issue 23; ISSN 1523-7060
• Country of Publication: United States
• Language: English

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