One-step hydrothermal synthesis of carbon dots-polymer composites with solid-state photoluminescence
One-step hydrothermal synthesis of carbon dots-polymer composites with solid-state photoluminescence
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一步水热合成固态光致发光碳点-聚合物复合材料
DOI：
10.1016/j.matlet.2018.11.147
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发表时间：
2019
影响因子：
3
通讯作者：
Zhang Pinhua
中科院分区：
文献类型：
--
作者：
Zheng Xuegang;Ding Guqiao;Wang Hailong;Cui Guangliang;Zhang Pinhua
以六次甲基四胺和聚碳酸酯为前驱体，采用水热法一步合成了碳量子点及其与聚合物的复合材料。研究了它们的光学性质及其作为固态荧光粉在白色发光二极管（LED）中的应用。在蓝光照射下，CdS溶液表现出强的黄光发射，并具有非激发依赖的发光行为。由于前驱体聚合，CD-聚合物复合材料一步合成。干燥的CD-聚合物复合粉末表现出优异的光学稳定性，并且没有观察到发光猝灭。在淡蓝色光照射下，样品呈现宽的黄色荧光，峰值波长位于550 nm，荧光量子产率为14.86%。对于它们的实际应用，稳定的白色光发射通过用粉末涂覆455 nm蓝色LED来证明。该研究为在低温、低成本条件下制备CD/聚合物复合材料，以及利用蓝光LED和无金属荧光粉制备白色LED提供了有价值的参考。
Carbon dots (CDs) and CDs-polymer composites were one-step synthesized in a hydrothermal process using hexamethylenetetramine and polycarbonate as precursors. Their optical properties and the application as solid-state phosphors towards white light-emitting diodes (LEDs) were thoroughly investigated. CDs solutions exhibit strong yellow emission under blue illumination and possess excitation-independent luminescent behavior. Owing to precursor polymerization, CDs-polymer composites were synthesized in one step. The dried CDs-polymer composite powders exhibit excellent optical stability and no luminescence quenching was observed. Under light blue illumination, the powders show broad yellow luminescence with the peak wavelength centered at 550 nm and PL quantum yield of 14.86%. For their practical applications, stable white light emission was demonstrated by coating a 455 nm blue LED with the powders. Our research offers a valuable reference for growing CDs-polymer composites in a facile, low-cost and low-temperature hydrothermal process and developing white LEDs with light blue LEDs and metal-free phosphors.