Study on Electroluminescence of the Phosphorescent Iridium(III) Complex Prepared by Ultrasonic Wave

Ir(pmb)(3) (Iridium(III) Tri(1-phenyl-3-methylbenzimidazolin-2-ylidene-C,C-2') was synthesized to develop a deep blue-emitting Ir(III) complex. We suggested the ultrasonic reactor to enhance the poor reaction yield of Ir(pmb)(3). The ultrasonic wave enhanced the reaction yield of Ir(pmb) 3 because the ultrasound helped non-soluble reactants disperse efficiently and produced free radial during the reaction. The maximum yield of Ir(pmb)(3) was 42.5%, which was 4 times higher than conventional method. Organic light emitting devices were fabricated with the synthesized mer-Ir(pmb)(3) which emitted at 405 nm. A range of host materials with large bandgaps (UGH2, mCP and CBP) were tested for developing a deep blue emitting device. In case of the device with mCP as the host material, it emitted deep blue and performed quite well relative to the other host materials tested.