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

Abstract

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(1phenylisoquinoline)iridium(III), Ir(piq) 3 ], orange phosphorescent dye {bis[2-(4-tertbutylphenyl)benzothiazolato-N, C 2 ]iridium (acetylacetonate), (tbt) 2 Ir(acac)}, and blue phosphorescent dye [bis(2, 4-di-fluorophenylpyridinato)-tetrakis(1pyrazolyl)borate iridium(III), FIr6] were investigated and compared. The (tbt) 2 Ir(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) 2 Ir(acac)-doped OIDs showed the maximum luminance, current efficiency, power efficiency of 70786 cd/m 2 , 39.55 cd/A, and 23.92 lm/W, respectively, and a decent detectivity of 1.07 × 10 11 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.

Laser-induced fluorescence experimental spectroscopy and theoretical calculations of uranium monoxide

“…However, considering that the uranium element has an open f orbital, UO has many low-energy electronic states and has a strong relativistic effect. [5][6][7] Coupled with the experimental dangerous and expensive costs, as well as the complexity of theoretical calculations, there are still huge challenges to the research on UO both experimentally and theoretically. Laser-induced fluorescence (LIF) technology combined with density functional theory (DFT) calculation [6,[8][9][10][11] happens to be a powerful technology for studying the electronic vibration and spin-orbit [12] of the target molecule.…”