Novel Divalent Osmium Complexes : Synthesis, Characterization, Tuning of Emission, and use in Organic Light Emitting Diodes

Research output: Journal Publications and ReviewsRGC 22 - Publication in policy or professional journal

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)363-368
Journal / PublicationMaterials Research Society Symposium - Proceedings
Volume771
Publication statusPublished - 2003
Externally publishedYes

Conference

TitleOrganic and Polymeric Materials and Devices
PlaceUnited States
CitySan Francisco, CA
Period22 - 25 April 2003

Abstract

In this work we present the synthesis and characterization of several novel osmium complexes of the form [Os(N-N)2 L-L]2+ 2Ts- or [Os(L-L)2 N-N]2+ 2Ts- designed for organic light emitting device (OLED) applications. In the complex notation N-N represents a derivative of 2,2′-bipyridine or 1,10-phenanthroline and L-L represents a strong π-acid arsine or phosphine ligand. Several counterions have been used and include tosylate, hexafluorophosphate, triflate, heptafluorobutyrate, chloride, bromide, and iodide. The complexes feature 3MLCT emission that ranges from 611-650 nm, which makes them suitable as an emission source for red OLEDs. Phosphorescent quantum yields as high as 45% and emission lifetimes as short as 400 nanoseconds have been reached. The complexes were incorporated into OLED and give off red, orange, yellow, and green electrophosphorescence. Red devices have been created using polyvmylcarb/2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole, polyvinylnapthalene/2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole, and polyfluorene host materials. OLEDs have been created which give brightness up to 3000 cd m-2 and efficiency up to 2.2% at 632 nm emission.

Citation Format(s)

Novel Divalent Osmium Complexes: Synthesis, Characterization, Tuning of Emission, and use in Organic Light Emitting Diodes. / Carlson, Branden; Phelan, Gregory D.; Kim, Joo H. et al.
In: Materials Research Society Symposium - Proceedings, Vol. 771, 2003, p. 363-368.

Research output: Journal Publications and ReviewsRGC 22 - Publication in policy or professional journal