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Quantum Dot–Polyfluorene Composites for White-Light-Emitting Quantum Dot-Based LEDs

机译:用于白光发光量子点的量子圆点 - 多氟硼复合材料

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摘要

Colloidal quantum dots (QDs) are a promising luminescent material for the development of next generation hybrid light-emitting diodes (QDLEDs). In particular, QDs are of great interest in terms of the development of solid-state light sources with an emission spectrum that mimics daylight. In this study, we used CdSe(core)/ZnS/CdS/ZnS(shell) QDs with organic ligands mimicking polyfluorene and its modified derivatives to obtain QD–polymer composites emitting white light. We found that the emission of the composites obtained by spin-coating, being strongly dependent on the chemical structure of the polymer matrix and the QD-to-polymer mass ratio, can be accurately controlled and adjusted to bring its emission spectrum close to the spectrum of daylight (CIE coordinates: 1931 0.307; 0.376). Moreover, the light emission of these composites has been found to be temporally stable, which is due to the minimal structural instability and volume-uniform charge and energy transfer properties. Thus, the use of the synthesized polyfluorene-based organic ligands with controllable chemical structures adaptable to the structure of the polymer matrix can significantly increase the stability of white light emission from QD composites, which can be considered promising electroluminescent materials for fabrication of white QDLEDs.
机译:胶体量子点(QDS)是用于开发下一代混合发光二极管(Qdleds)的有希望的发光材料。特别是,QDS对具有模拟日光的发射光谱的固态光源的发展非常兴趣。在该研究中,我们使用Cdse(核心)/ ZnS / Cds / ZnS(壳)QDs与模拟多氟烯及其改性衍生物的有机配体,以获得发射白光的QD聚合物复合材料。我们发现,通过旋转涂层获得的复合材料的发射,强烈取决于聚合物基质的化学结构和QD-聚合物质量比,可以精确地控制和调整,以使其排放光谱接近光谱日光(CIE坐标:1931 0.307; 0.376)。此外,已经发现这些复合材料的光发射在时间上稳定,这是由于结构不稳定性和体积均匀的电荷和能量转移性能最小。因此,使用适用于聚合物基质结构的可控化学结构的合成的聚芴基有机配体可以显着提高QD复合材料的白光发射的稳定性,这可以被认为是用于制造白色Qdleds的有望的电致发光材料。

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