Journal of Materials Chemistry C p. 10029 - 10038 (2017)
Update date:2022-07-30
Topics: Solution-Processable Highly Efficient Deep-Red and Orange Organic Light-Emitting Diodes (OLEDs) Multi-Functional Ir(III) Complexes
Cho, Woosum
Sarada, Ganguri
Maheshwaran, Athithan
Gal, Yeong-Soon
Nam, Yeonsig
Yong Lee, Jin
Jin, Sung-Ho
A heteroleptic deep-red iridium(iii) complex, TPQIr-HT, based on thiophene-phenylquinoline (TPQ), and orange Ir(iii) complexes, m-CF3DPQIr-HT and m-CF3DPQIr-ET based on diphenylquinoline (DPQ), are designed by attaching a carbazole-based hole transporting (HT) group and an oxadiazole (OXD)-based electron transporting (ET) group to the parent Ir(iii) complexes, TPQIr and m-CF3DPQIr. The Ir(iii) complexes TPQIr-HT show a deep-red emission peak at 612 nm, similar to that of TPQIr, whereas m-CF3DPQIr-HT and m-CF3DPQIr-ET show an orange emission peak at 567 ± 1 nm, which is similar to that of m-CF3DPQIr. The newly functionalized Ir(iii) complexes show improved device performance compared to the Ir(iii) complexes, TPQIr and m-CF3DPQIr, without the additional functional groups. The phosphorescent organic light-emitting diodes (PhOLEDs) fabricated using a deep-red Ir(iii) complex, TPQIr-ET, achieved a maximum external quantum efficiency (EQE) of 17.47% using GraHIL as the hole injection layer (HIL). Similarly, the orange Ir(iii) complex, m-CF3DPQIr-HT, achieved a maximum EQE of 21.61%.
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