Photo- and field-induced charge-separation and phosphorescence quenching in organometallic complex Ir(ppy)3

Mohan Singh Mehata, Nobuhiro Ohta
2011 Applied Physics Letters  
Electric field effects on absorption and photoluminescence ͑PL͒ spectra of organometallic phosphorescent emitter Ir͑ppy͒ 3 , ͕tris͓2-phenylpyridinato-C 2 ,N͔ iridium ͑III͖͒ doped in a film of polymethyl methacrylate ͑PMMA͒ have been confirmed at temperatures in the range of 40-295 K. Field-induced quenching of PL observed for Ir͑ppy͒ 3 is attributed to the decrease both of emitting state population and of the lifetime of PL. The quenching is independent of excitation energy as well as
more » ... e. Field-assisted charge separation or dissociation of electron-hole ͑e-h͒ pair produced by photoexcitation may decrease the population of the emitting state. The Stark shifts on absorption and PL spectra have also been analyzed.
doi:10.1063/1.3582916 fatcat:sa5dyosrzbgxrmiy3wj26uxc5a