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An effective method to prepare polymeranocrystal composites with tunable emission over the whole visible light range

机译:一种制备在整个可见光范围内具有可调发射的聚合物/纳米晶体复合材料的有效方法

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Materials with emission over the whole visible range (400-800 nm) have been obtained through incorporating single-colored CdTe nanocrystals (NCs) into a poly(p-phenylene vinylene) (PPV) precursor [the sulfonium polyelectrolyte precursor of PPV]. Firstly, the quantum yield (QY) of the PPV precursor was improved to ~50% via heat treatment of a mixed solution of the PPV precursor and poly(vinyl alcohol) (PVA) at 100 °C for 3 min. Then, single-colored CdTe NCs were incorporated into the mixed solution. The introduction of the PVA was necessary to reduce the electrostatic interaction between the PPV precursor and CdTe NCs, which improved their compatibility. The reduced electrostatic interaction eliminated F?rster resonance energy transfer (FRET) processes between NCs, as well as between NCs and the PPV precursor, which allowed the functional integration of the polymer and NCs. Consequently, polymer/NC composites with almost any Commission Internationale de L'Eclairage (CIE) coordinates can be achieved by simply changing the size and amount of the NCs. In particular, when the emission wavelength of the CdTe NCs was 559 nm, a pure white-light emitting material with CIE coordinates (0.337, 0.332) was obtained.
机译:通过将单色CdTe纳米晶体(NCs)掺入聚对苯撑亚乙烯基(PPV)前驱体[PPV的poly聚电解质前驱体]中,可以获得在整个可见光范围(400-800 nm)内具有发射性能的材料。首先,通过在100°C下对PPV前体和聚乙烯醇(PVA)的混合溶液进行热处理3分钟,可以将PPV前体的量子产率(QY)提高到〜50%。然后,将单色CdTe NC掺入混合溶液中。 PVA的引入对于减少PPV前驱体与CdTe NCs之间的静电相互作用是必要的,这改善了它们的相容性。减少的静电相互作用消除了NC之间以及NC与PPV前体之间的酯共振能量转移(FRET)过程,从而使聚合物和NC进行了功能整合。因此,只需更改NC的大小和数量,即可获得几乎具有国际照明委员会(CIE)坐标的聚合物/ NC复合材料。特别地,当CdTe NCs的发射波长为559nm时,获得具有CIE坐标(0.337,0.332)的纯白色发光材料。

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