A New Iridium(III) Complex as a Deep-Red Phosphorescent Emitter in Organic Light-Emitting Diodes

作者：Kim Hee Un; Jang Jae Ho; Xu Fei; Lee Jun Yeob; Hwang Do Hoon^*

来源：Journal of Nanoscience and Nanotechnology, 2016, 16(3): 2773-2778.

DOI：10.1166/jnn.2016.11075

We synthesized a novel red-emitting iridium(III) complex, bis[2-(5-(9H-carbazole-9-yl)thiophene-2-yl)benzo[d]thiazole]iridium(III)acetylacetonate ([(CTBT)(2)Ir(acac)]), for use in phosphorescent organic light-emitting diodes. The photophysical and electrochemical properties of [(CTBT) 2Ir(acac)] were characterized using photoluminescence (PL) and cyclic voltammetry. The photophysical properties of [(CTBT)(2)Ir(acac)] included PL emission at 630 nm. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of [(CTBT) 2Ir(acac)] were calculated to be -5.14 and -2.83 eV, respectively. Phosphorescent organic light-emitting diodes with a configuration of ITO/PEDOT: PSS (30 nm)/TAPC (30 nm)/TPBi (12.5 nm): TCTA (12.5 nm): dopant (3%, 5%, 10%)/TSPO1 (35 nm)/LiF (1 nm)/Al (100 nm) were fabricated and characterized. The fabricated device doped with 5% [(CTBT)(2)Ir(acac)] showed a high luminous efficiency of 2.06 cd/A, maximum external quantum efficiency of 4.32% at 4 V, maximum outstanding luminance of 398.8 cd/m(2), and maximum power efficiency of 1.79 lm/W with Commission Internationale de L'Eclairage (CIE) coordinates of (0.69, 0.31).

• 出版日期2016-3