Stabilized blue luminescent polyfluorenes: Introducing polyhedral oligomeric silsesquioxane

被引：141
作者：
Lee, J
Cho, HJ
Jung, BJ
Cho, NS
Shim, HK [1 ]
机构：
[1] Korea Adv Inst Sci & Technol, Ctr Adv Funct Polymers, Dept Chem, Taejon 305701, South Korea
[2] Korea Adv Inst Sci & Technol, Sch Mol Sci BK 21, Taejon 305701, South Korea
来源：
MACROMOLECULES | 2004年 / 37卷 / 23期
关键词：
D O I：
10.1021/ma0497759
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The synthesized polymers could be well characterized by H-1 NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on the quartz film showed reduced aggregation/excimer formation because the bulky POSS group prohibited interchain interactions. This effective dilution effect and the high thermal stability of the POSS unit also improved the color stability of PFPOSSs blue emission even after thermal annealing at 150 degreesC. The fluorescence quantum yields (Phi(FL)) of PFPOSSs in both solution and solid state were higher than those of poly(dialkylfluorene)s. Moreover, the ITO/PEDOT-PSS/polymer/Ca/Al LED device using this polymer as emitting layer showed a very stable blue light emission. LED devices of PFPOSSs showed a low turn-on voltage of 3.7-4.4 V, high brightness of 350-1010 cd/m(2), and external efficiencies of 0.11-0.36%.
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页码：8523 / 8529
页数：7
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