ICCAS OpenIR
Synthesis, Photophysics, and Electroluminescence of Copolyfluorenes Containing Jacketed and Silyl Units
Wang, Ping; Yang, Qian; Jin, Hao; Liu, Wanli; Shen, Zhihao; Chen, Xiaofang; Fan, Xinghe; Zou, Dechun; Zhou, Qifeng
2008-11-25
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume41Issue:22Pages:8354-8359
AbstractNew copolyfluorenes (PSiC8OF0 similar to PSiC8OF50) composed of 9,9-dioctylfluorene, jacketed units 2,5-bis[(5-octyloxy-phenyl)-1,3,4- oxadiazole]-l-(3,5-dibromophenyl)-benzene (35C8) and 2,5-bis(trimethylsilyl)benzene were synthesized by palladium-catalyzed Suzuki coupling reaction. They were characterized by GPC, H-1 NMR, elemental analysis, DSC, TGA, absorption and emission spectroscopy, and cyclic voltammetry (CV). These copolymers were readily soluble in common organic solvents and exhibited high glass transition temperature (up to 173 degrees C). The copolymer films showed absorption peaks from 325 to 337 nm, and PL peaks from 402 to 408 nm with a great blue shift relative to polyfluorene (377 and 432 nm) originated from silyl and jacketed units. The transient PL spectra show a rapid rise in the lifetime, implying a sharp increase in molecular rigidity and an additional long decay time around 5 similar to 6 ns, assigned to an "excimer-like" state, and its contribution increases with the increased jacketed fraction. The HOMO energy levels and LUMO levels changed from -5.59 similar to-6.07. eV and -2.60 similar to-3.01 eV as the incorporation of silyl and jacketed units, which facilitated electron injection. Electroluminescent devices: ITO/PEDOT:PSS/PVK/polymer/TPBI (15nm)/Ca (30 nm)/Ag (80 nm) were fabricated to investigate the influence of jacketed and silyl contents on the emission characteristics. The maximum current efficiency and external quantum efficiency of the PSiC8OF5 device (0.484 cd/A and 1.35%) surpassed those of the PC8OF0 device (0.416 cd/A and 0.51%). The EL emissions of PSiC8OF0 and PSiC8OF5 were bright blue and pure blue with sharp emissions, respectively, while PSiC8OF10 similar to PSiC8OF50 showed emissions between them. This indicates that copolymer PSiC8OF5 could be a good candidate for blue light-emitting materials.
DOI10.1021/ma801619d
Indexed BySCI
Language英语
WOS IDWOS:000261003700015
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/64050
Collection中国科学院化学研究所
Corresponding AuthorFan, Xinghe
AffiliationPeking Univ, Beijing Natl Lab Mol Sci, Key Lab Polymer Chem & Phys, Minist Educ,Coll Chem & Mol Engn, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Wang, Ping,Yang, Qian,Jin, Hao,et al. Synthesis, Photophysics, and Electroluminescence of Copolyfluorenes Containing Jacketed and Silyl Units[J]. MACROMOLECULES,2008,41(22):8354-8359.
APA Wang, Ping.,Yang, Qian.,Jin, Hao.,Liu, Wanli.,Shen, Zhihao.,...&Zhou, Qifeng.(2008).Synthesis, Photophysics, and Electroluminescence of Copolyfluorenes Containing Jacketed and Silyl Units.MACROMOLECULES,41(22),8354-8359.
MLA Wang, Ping,et al."Synthesis, Photophysics, and Electroluminescence of Copolyfluorenes Containing Jacketed and Silyl Units".MACROMOLECULES 41.22(2008):8354-8359.
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