Preparation and Luminescence Properties of Polymers Containing Dialkoxyacenes

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• 作者：Mu-Lin Tsai ; Ching-Yang Liu ; Ya-Yun Wang ; Jao-yu Chen ; Teh-Chang Chou ; Hsiu-Mei Lin ; Sheng-Heng Tsai ; and Tahsin J. Chow
• 刊名：Chemistry of Materials
• 出版年：2004
• 出版时间：August 24, 2004
• 年：2004
• 卷：16
• 期：17
• 页码：3373 - 3380
• 全文大小：159K
• 年卷期：v.16,no.17(August 24, 2004)
• ISSN：1520-5002

文摘

Derivatives of 2,3-(1,4-dialkoxyaceno)norbornadiene 1-4 underwent ring-opening metathesis polymerization (ROMP) reactions with a ruthenium carbene complex Cl₂(PCy₃)₂Ru=CHPh to afford the corresponding polymers P1-P4 with narrow polydispersity. Thesematerials exhibited luminescence both in solution and as films, whereas P3 and P4 wereused successfully for the fabrication of light emitting diodes (LED). The device ITO/P4/Ca/Al, made of a spin-coated layer of P3 or P4, displayed white light that can be turned on at7 V with a maximum intensity of 427 cd/m² at 15 V. The white electroluminescence iscomposed of a blue emission band from the aromatic chromophore and a red componentderived from solid aggregates. The performance of devices can be improved by insertion ofan additional electron-transporting layer, i.e., 1,3,5-tris(2'-(1'-phenyl-1'-H-benzimidazole)benzene (TPBI). The device ITO/P4/TPBI/Mg:Ag displayed blue light with a turn-on voltageof 5 V and maximal intensity of 930 cd/m² at 15 V. The change of chromaticity can be ascribedto a shift of charge recombination sites in the bulk of P4 film. The phenomenon was verifiedby adjusting the thickness of TPBI layer, whereas a continuous variation in color wasobserved upon changing bias.