Synthesis and Photophysical Properties of Tris(pinene-2-phenylpyridine) Iridium Complexes with Alkoxy Groups

Chem. J. Chinese Universities

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Synthesis and Photophysical Properties of Tris(pinene-2-phenylpyridine) Iridium Complexes with Alkoxy Groups

HE Jian^1,2, WANG Peng-Fei¹, LIU Hong-Mei^1,2, ZHANG Xiao-Hong¹*

1. Nano-Organic Photoelectronic Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Received:2006-04-10 Revised:1900-01-01 Online:2007-04-10 Published:2007-04-10
Contact: ZHANG Xiao-Hong

Abstract

Abstract: Heavy metal complexes as the highly efficient phosphorescent emitters in organic light emitting diodes(OLEDs) have been extensively studied in recent years. The complexes containing Ir(Ⅲ) have usually been modified to further improve electroluminescence(EL) efficiency. In our previous work, Ir(pppy)₃[tris(5-phenyl-10,10-dimethyl-4-aza-tricycloundeca-2,4,6-triene)iridium]was synthesized by introducing pinene group as a spacer to decrease concentration quenching and showed good EL performances. In the present work, we studied the modified Ir(pppy)₃ by attaching side alkoxy group to the pinene-2-phenylpyridine ligand, which is hoped to improve the chemical compatibility with host and further inhibit phase segregation in polymer matrix. The new series of Ir(Ⅲ) complexes [Ir(RO-pppy)₃] were synthesized and the photophysical properties were investigated. Strong triplet emission peak at around 496 nm was observed with phosphorescence quantum yield Φ_F=0.4—0.6, emission lifetimes τ=2—4 μs. Complex 8 [Ir(C₁₆H₃₃O-pppy)₃] has special photophysical properties: no blue-shift on going from room temperature(298.15 K) to 77 K was observed and with relatively less part of long-lifetime in decay process. The results indicate that the complex with long side chains can reduce the aggregation between molecules, thus can be used as promising efficient phosphorescent emitter in OLEDs.

Key words: Iridium(Ⅲ) complex, Triplet, Aggregation, Phosphorescent material, Organic light emitting diodes(OLEDs)

CLC Number:

O621

TrendMD:

HE Jian^1,2, WANG Peng-Fei¹, LIU Hong-Mei^1,2, ZHANG Xiao-Hong¹*. Synthesis and Photophysical Properties of Tris(pinene-2-phenylpyridine) Iridium Complexes with Alkoxy Groups[J]. Chem. J. Chinese Universities, doi: .

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Synthesis and Photophysical Properties of Tris(pinene-2-phenylpyridine) Iridium Complexes with Alkoxy Groups

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