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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Large Stokes shifted quaternary copper cadmium sulfide selenide quantum dot waveguides
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Large Stokes shifted quaternary copper cadmium sulfide selenide quantum dot waveguides

机译：大型斯托克斯偏移季铜硫化镉硒化物量子点波导

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摘要

Stokes shift engineering of quantum dots is an attractive approach to enhance luminescence efficiency by reducing reabsorption losses. We report for the first time a route to the colloidal synthesis of new quaternary alloyed I-II-VI2 copper cadmium sulfide selenide quantum dots exhibiting bright and stable photoluminescence with an absolute photoluminescence quantum yield of 62%. The alloyed quantum dots exhibit a record Stokes shift of 670 meV, which can be further tuned by composition variation during annealing. This large Stokes shift leads to minimum reabsorption, a feature beneficial to obtain bright photoluminescence. We fabricate optical waveguide slabs by impregnating quantum dots in polydimethylsiloxane to transmit the photoluminescence of the quantum dots without significant deviation of efficiency. The waveguide slabs show an average visible transmittance of 70% and flexibility over a wide range of bending angles. Our approach to obtain an unprecedented combination of a large Stokes shift and a high photoluminescence quantum yield illustrates the potential of quaternary quantum dots for meeting the requirements of reliable, sustainable and competitive modulated light guiding systems.
机译：量子点斯托克斯位移工程是一种通过减少重吸收损耗来提高发光效率的有吸引力的方法。我们首次报道了一种新的四元合金I-II-VI2硫化铜镉硒化物量子点的胶体合成路线，该量子点具有明亮稳定的光致发光，绝对光致发光量子产率为62%。合金化量子点的斯托克斯位移达到了创纪录的670mev，这可以通过退火过程中的成分变化进一步调整。这种较大的斯托克斯位移导致最小的再吸收，这一特性有利于获得明亮的光致发光。我们通过在聚二甲基硅氧烷中浸渍量子点来制备光波导板，以在不显著偏离效率的情况下传输量子点的光致发光。波导板显示出70%的平均可见光透过率和在大范围弯曲角度下的灵活性。我们获得大斯托克斯位移和高光致发光量子产率的前所未有的结合的方法说明了四元量子点在满足可靠、可持续和竞争性调制光引导系统的要求方面的潜力。

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