New well-defined poly(2,7-fluorene) derivatives: Photoluminescence and base doping
New well-defined poly(2,7-fluorene) derivatives: Photoluminescence and base doping
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DOI：
10.1021/ma970920a
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发表时间：
1997-12-15
期刊：
影响因子：
5.5
通讯作者：
Leclerc, M
中科院分区：
文献类型：
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作者：
Ranger, M;Rondeau, D;Leclerc, M
在钯催化下，2，7-二（4，4，5，5-四甲基-1，3，2-二氧杂硼杂环戊烷-2-基）-9，9-二辛基芴与9，9-二取代或9-单取代的2，7-二溴芴发生偶联反应，合成了结构明确的聚2，7-芴衍生物。使用这种通用的合成方法，以良好的产率获得了可加工的聚芴。在溶液中，所有这些中性黄色聚合物表现出高量子产率（高达0.87）的蓝光发射（在410 nm附近的发射最大值）。此外，已经合成了新的酸性聚芴衍生物（即，聚[2，7 ′-（9，9-二辛基-7，2 ′-联芴-9 ′-羧酸烷基酯）]），其在碱掺杂时显示出10（-6）-10（-5）S/cm的电导率。这种新的共轭聚合物掺杂方法为制备空气稳定的电子注入电极开辟了道路。这些聚合物的物理和电学性质对于制备高效的蓝光发射器件是非常有希望的。
Well-defined poly(2,7-fluorene) derivatives have been prepared through palladium-catalyzed couplings between various 9,9-disubstituted or 9-monosubstiiuted 2,7-dibromofluorenes and 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9-dioctylfluorene. Using this versatile synthetic method, processable polyfluorenes have been obtained in good yields. In solution, all these neutral yellow polymers exhibit blue emission (maximum of emission around 410 nm) with high quantum yields (up to 0.87). Moreover, novel acidic polyfluorene derivatives have been synthesized (i.e., poly[2,7'-(alkyl 9,9-dioctyl-7,2'-bifluorene-9'-carboxylate)]s) which show, upon base doping, electrical conductivities of 10(-6)-10(-5) S/cm. This new doping method for conjugated polymers could open the way to the preparation of air-stable electron-injecting electrodes. Both photophysical and electrical properties of these polymers are quite promising for the fabrication of efficient blue-light-emitting devices.