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首页> 外文期刊>RSC Advances >Hyperbranched fluorene-alt-carbazole copolymers with spiro[3.3]heptane-2,6-dispirofluorene as the core and their application in white polymer light-emitting devices
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Hyperbranched fluorene-alt-carbazole copolymers with spiro[3.3]heptane-2,6-dispirofluorene as the core and their application in white polymer light-emitting devices

机译：以螺[3.3]庚烷-2,6-二螺芴为核的超支化芴-alt-咔唑共聚物及其在白色聚合物发光器件中的应用

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摘要

A series of hyperbranched copolymers with fluorene-alt-carbazole as the branches and three-dimensionalstructured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core were synthesized by one-pot Suzuki polycondensation. 4,7-Dithienyl-2,1,3-benzothiadiazole (DBT) as the orange-light emitting unit was introduced into the backbones to obtain white-light emission. The thermal, photoluminescent (PL), electrochemical and electroluminescent (EL) properties of the copolymers were investigated. The copolymers show great thermal stabilities by the introduction of a carbazole moiety. Besides, the HOMO energy levels of the copolymers were enhanced and the hole injection was improved because of the hole-transporting ability of the carbazole unit. The hyperbranched structures suppress the interchain interactions efficiently, and help to form amorphous films. The copolymers exhibit efficient EL performance as a result of the hyperbranched structure with the incorporation of the carbazole moiety. A quite low turn-on voltage of 5.3 V, a maximal luminance of 7409.5 cd m(-2) and a luminous efficiency of 4.27 cd A(-1) were achieved with a CIE coordinate of (0.32, 0.26) for the PFCzSDF10DBT10 (10 mol% of SDF and 0.1 mol% of DBT) device. The hyperbranched framework based on fluorene-alt-carbazole branches and SDF core are attractive candidates for solution-processable white polymer light-emitting device (WPLED) applications.
机译：通过一锅Suzuki缩聚反应，合成了一系列以芴-alt-咔唑为支链，三维结构的螺[3.3]庚烷-2,6-二螺芴（SDF）为核的超支化共聚物。将作为橙色发光单元的4,7-二噻吩基-2,1,3-苯并噻二唑（DBT）引入骨架，以获得白色发光。研究了共聚物的热，光致发光（PL），电化学和电致发光（EL）性能。通过引入咔唑部分，该共聚物显示出极大的热稳定性。此外，由于咔唑单元的空穴传输能力，提高了共聚物的HOMO能级并改善了空穴注入。超支化结构可有效抑制链间相互作用，并有助于形成非晶膜。由于结合了咔唑部分的超支化结构，该共聚物表现出有效的EL性能。 PFCzSDF10DBT10的CIE坐标为（0.32，0.26），实现了5.3 V的非常低的开启电压，最大亮度7409.5 cd m（-2）和4.27 cd A（-1）的发光效率（ 10 mol％的SDF和0.1 mol％的DBT）设备。基于芴-alt-咔唑支链和SDF核的超支化骨架是可溶液加工的白色聚合物发光器件（WPLED）应用的诱人候选者。

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