Enhancement of electroluminescent properties of organic optoelectronic integrated device by doping phosphorescent dye

Lei Shu-ying^{1, 2}, Zhong Jian^{1, 2, †}, Zhou Dian-li^{1, 2}, Zhu Fang-yun^{1, 2}, Deng Chao-xu^{1, 2}

(color online) (a) PL spectra and normalized UV–vis absorption spectra of (tbt)₂Ir(acac) and 2CzPN neat films. (b) Normalized EL spectra of OIDs with stepped dopant concentrations. Inset: normalized EL spectra of device B2 at a driving voltage ranged from 7 V to 11 V. (c) Current density–voltage–luminance curves. (d) Power efficiency–current density–current efficiency curves of OIDs with stepped dopant concentrations.