Abstract
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 language | English (US) |
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Article number | 243507 |
Pages (from-to) | 1-3 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 87 |
Issue number | 24 |
DOIs | |
State | Published - 2005 |
Externally published | Yes |
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.