3 years ago

5,9-Dioxa-13b-Oxophosphanaphtho[3,2,1-de]anthracenes Prepared by Tandem Phospha-Friedel–Crafts Reaction as Hole-/Exciton-Blocking Materials for OLEDs

5,9-Dioxa-13b-Oxophosphanaphtho[3,2,1-de]anthracenes Prepared by Tandem Phospha-Friedel–Crafts Reaction as Hole-/Exciton-Blocking Materials for OLEDs
Toshiaki Ikuta, Akiko Kageyama, Takuji Hatakeyama, Soichiro Nakatsuka, Yasuyuki Sasada, Hajime Gotoh
We report a short synthesis of phosphorus-fused triarylphosphine oxides, 5,9-dioxa-13b-oxophosphanaphtho[3,2,1-de]anthracenes (DOPNAs), based on a tandem phospha-Friedel–Crafts reaction. Phosphorescence, UV–visible absorption, and photoelectron yield spectroscopy of vacuum-deposited thin films revealed that the triplet energies, optical band gaps, and ionization potentials of these materials were sufficiently large for them to be utilized in organic light-emitting diodes (OLEDs). Therefore, we fabricated a set of phosphorescent OLEDs based on the above phosphine oxides, confirming that the utilization of these compounds as hole-/exciton-blocking materials significantly improved OLED efficiencies and lifetimes.

Publisher URL: http://dx.doi.org/10.1021/acs.organomet.7b00242

DOI: 10.1021/acs.organomet.7b00242

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