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 dye [tris(1-phenylisoquinoline)iridium(III), Ir(piq)₃], orange phosphorescent dye {bis[2-(4-tertbutylphenyl)benzothiazolato-N, C^2′]iridium (acetylacetonate), (tbt)₂Ir(acac)}, and blue phosphorescent dye [bis(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. (paper)