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

Research output: Chapter in Book/Report/Conference proceedingChapter


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. The study of blue organic electrophosphorescence has focused predominantly on the use of electron-withdrawing fluorine atoms to shift the molecular triplet state to the higher energies required. For example, external quantum efficiencies exceeding 10% have been demonstrated using fluorinated phenyl-pyridine complexes. There are drawbacks to using this technique, namely that the saturated blue phosphorescence required for many display applications may not be achievable through fluorination. In addition, the large electronegativity of the fluorine atom may destabilize the molecule, making it electrochemically reactive, leading to potentially short device operational lifetimes. Both of these challenges underscore the need for fluorine-free, deep blue emitting phosphors.

Original languageEnglish (US)
Title of host publicationElectrophosphorescent Materials and Devices
PublisherJenny Stanford Publishing
Number of pages10
ISBN (Electronic)9781000190830
ISBN (Print)9789814877343
StatePublished - Jan 1 2023
Externally publishedYes

Bibliographical note

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© 2024 Jenny Stanford Publishing Pte. Ltd.


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