Synthesis and characterization of novel red-emitting alternating copolymers based on fluorene and diketopyrrolopyrrole derivatives

被引:95
作者
Cao, DR [1 ]
Liu, QL
Zeng, WJ
Han, SH
Peng, JB
Liu, SP
机构
[1] Chinese Acad Sci, Guangzhou Inst Chem, Guangzhou 510650, Peoples R China
[2] S China Univ Technol, Coll Chem, Guangzhou 510640, Peoples R China
[3] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
[4] S China Univ Technol, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Peoples R China
[5] Singapore Natl Eye Ctr, Singapore Eye Res Inst, Singapore 168751, Singapore
关键词
conjugated polymers; diketopyrrolopyrrole; fluorene; fluorescence; light-emitting diodes (LED);
D O I
10.1002/pola.21354
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Two novel alternating copolymers, poly{9,9-dihexylfluorene-2,7-diyl-alt-2,5dioctyl-3,6-bis(4-phenyl)pyrrolol[3,4-c] pyrrole-1,4-dione} (P1) and poly{9,9-dihexylfluorene-2,7-diyl-alt-2,5-diocty-3,6-bis(3-phenyl)pyrrolo[3,4-c]pyrrole-1,4-dione} (P2), derived from 9,9-dihexylfluorene and diketopyrrolopyrrole (DPP), have been successfully synthesized through palladium-catalyzed Suzuki polycondensation in good yields. P1 and P2 possess moderate molecular weights and polydispersities, well-defined structures, and excellent thermal properties with an onset decomposition temperature around 400 degrees C. Both P1 and P2 in thin films exhibit red photoluminescence from DPP species exclusively, with peaks at 609 and 616 nm, respectively Cyclic voltammetry studies show that P1 and P2 have low-lying lowest unoccupied molecular orbital energy levels at -3.65 eV and reversible reduction processes, so these polymers may constitute another kind of red-emitting polymer with high electron affinity. Preliminary electroluminescent results of devices with an indium tin oxide/poly(3,4-ethylenedioxythiophene)/polymer/Ba/Al configuration reveal that P1 may be a promising candidate for red emitters with a maximum brightness of 153 cd/m(2) and a maximum external quantum efficiency of 0.13%, whereas the performance of P2 is relatively poor. These differences might originate from dffferent conjugation lengths in their main chain. (c) 2006 Wiley Periodicals, Inc.
引用
收藏
页码:2395 / 2405
页数:11
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