Synthesis and light-emitting properties of new poly(p-phenylenevinylene) derivatives containing oxadiazole moiety

• Published in: Journal of applied polymer science 2002-12, Vol.86 (10), p.2424-2428
• Main Authors: Wang, Shu, Hua, Wenting, Chen, Xiaohong, Hou, Yanbing
• Format: Article
• Language: English
• Subjects: Applied sciences; electroluminescene; Exact sciences and technology; Organic polymers; oxadiazole; Physicochemistry of polymers; poly(p-phenylenevinylene) derivatives; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.10931

Two new poly(p‐phenylenevinylene) (PPV) derivatives containing the oxadiazole moiety (OXA–PPV1 and OXA–PPV2) were synthesized by the Wittig condensation polymerization reaction and their thermal and light‐emitting properties were investigated. The single‐layer and triple‐layer electroluminescent (EL) devices with configurations of ITO/OXA–PPV1/Al and ITO/OXA–PPV1/OXD/Alq3/Al were fabricated. They both exhibited blue emission at 460 nm. For comparison, the PPV derivative containing the oxadiazole moiety only in the side chains (OXA–PPV2) was also synthesized. Both single‐layer and triple‐layer EL devices with OXA–PPV2 as the emissive layer emitted green‐light at 560 nm. The turn‐on voltages of the triple‐layer device was 11 V for OXA–PPV1 and 8 V for OXA–PPV2. The triple‐layer EL devices showed much better performance than that of the single‐layer devices. The spectra indicated that energy or electron transfer occurred from the side‐chain oxadiazole to the main‐chain styrene unit. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2424–2428, 2002