Saturated deep blue organic electrophosphorescence using a fluorine-free emitter

R. J. Holmes, S. R. Forrest, T. Sajoto, A. Tamayo, P. I. Djurovich, M. E. Thompson, J. Brooks, Y. J. Tung, B. W. D'Andrade, M. S. Weaver, R. C. Kwong, J. J. Brown

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241 Scopus citations


We demonstrate saturated, deep blue organic electrophosphorescence using the facial- and meridianal- isomers of the fluorine-free emitter tris(phenyl-methyl-benzimidazolyl)iridium(III) (f-Ir (pmb)3 and m-Ir (pmb)3, respectively) doped into the wide energy gap host, p -bis(triphenylsilyly)benzene (UGH2). The highest energy electrophosphorescent transition occurs at a wavelength of λ=389 nm for the fac- isomer and λ=395 nm for the mer- isomer. The emission chromaticity is characterized by Commission Internationale de l'Eclairage coordinates of (x=0.17,y=0.06) for both isomers. Peak quantum and power efficiencies of (2.6±0.3) % and (0.5±0.1) lmW and (5.8±0.6) % and (1.7±0.2) lmW are obtained using f-Ir (pmb)3 and m-Ir (pmb)3 respectively. This work represents a departure from previously explored, fluorinated blue phosphors, and demonstrates an efficient deep blue/near ultraviolet electrophosphorescent device.

Original languageEnglish (US)
Article number243507
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number24
StatePublished - 2005
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank PPG Industries for providing some of the materials used, and the Department of Energy Office of Basic Energy Sciences for partial support of this work.


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