Increasing of stability depended on the position of alkoxy group in PPV

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• 作者：Suhee Song^a ; Sung Heum Park^b ; ^e ; Jaeyeon Jung^a ; Il Kim^c ; Kwanghee Lee^e ; Youngeup Jin^d ; ^{yjin@pknu.ac.kr"" rel=""nofollow} ; Hongsuk Suh^a ; ^{hssuh@pusan.ac.kr"" rel=""nofollow}
• 关键词：PLED ; Color stability ; PPVs ; Fluoro
• 刊名：Synthetic Metals
• 出版年：2011
• 出版时间：July 2011
• 年：2011
• 卷：161
• 期：13-14
• 页码：1186-1193
• 全文大小：587 K

文摘

In order to prevent the photo oxidation of the vinylene group of poly(p-phenylenevinylene) (PPV) series, the poly(p-phenylenedifluorovinylene) (PPDFV) derivatives with difluoro groups on vinylene unit were synthesized by Gilch polymerization using potassium tertbutoxide. The stability of the PPDFV backbone is attributed to the electron-withdrawing effect of the fluoro groups which prohibit the initial step of [2+2] cycloaddition for the oxidation of the vinylene unit. In photo-degradation experiments with white light, the PL spectra of m-EHOPh-PPDFV film is blue shifted about 19 nm and the optical density of the side peak at 380 nm is increased to 0.5 atomic unit. In case of p-EHOPh-PPDFV, the PL spectra show almost same maxima peaks at 448–450 nm after irradiation from 1 h to 5 h. p-EHOPh-PPDFV with para-alkoxy phenyl group shows very stable PL spectra against photo oxidation as compared to the case of m-EHOPh-PPDFV with meta-alkoxy phenyl group.