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

Organic optoelectronic integrated devices (OIDs) with ultraviolet (UV) photodetectivity and different color emitting were constructed by using a thermally activated delayed fluorescence (TADF) material 4, 5-bis(carbazol-9-yl)-1, 2-dicyanobenzene (2CzPN) as host. The OIDs doping with typical red phosphorescent dyetris(1-phenylisoquinoline)iridium(Ⅲ), Ir(piq)₃, orange phosphorescent dye bis2-(4-tertbutylphenyl)benzothiazolato-N, C^2'iridium (acetylacetonate), (tbt)₂Ir(acac), and blue phosphorescent dyebis(2, 4-di-fluorophenylpyridinato)-tetrakis(1-pyrazolyl)borate iridium(Ⅲ), FIr6 were investigated and compared. The (tbt)₂Ir(acac)-doped orange device showed better performance than those of red and blue devices, which was ascribed to more effective energy transfer. Meanwhile, at a low dopant concentration of 3 wt.%, the (tbt)₂Ir(acac)-doped OIDs showed the maximum luminance, current efficiency, power efficiency of 70786 cd/m², 39.55 cd/A, and 23.92 lm/W, respectively, and a decent detectivity of 1.07×10¹¹ Jones at a bias of-2 V under the UV-350 nm illumination. This work may arouse widespread interest in constructing high efficiency and luminance OIDs based on doping phosphorescent dye.