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

Published online by Cambridge University Press:  15 February 2011

Brenden Carlson ,
Gregory D. Phelan ,
Joo H. Kim ,
Alex K.-Y. Jen  and
Larry Dalton
Brenden Carlson
Affiliation:
Chemistry Department, University of Washington BOX 351700, Seattle, WA 98195 Applied Research Associates 215 Harrison Ave., Panama City Fl, 32401
Gregory D. Phelan
Affiliation:
Chemistry Department, University of Washington BOX 351700, Seattle, WA 98195 Seattle Pacific University 3307 3rd Avenue West, Seattle. WA, 98107
Joo H. Kim
Affiliation:
Department of Materials Science and Engineering, University of Washington BOX, Seattle, WA, 98195
Alex K.-Y. Jen
Affiliation:
Department of Materials Science and Engineering, University of Washington BOX, Seattle, WA, 98195
Larry Dalton
Affiliation:
Chemistry Department, University of Washington BOX 351700, Seattle, WA 98195
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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 polyvinylcarb/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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L10.34
Copyright
Copyright © Materials Research Society 2003

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