碳纳米点@聚丙烯酸钠复合材料的制备及在发光二极管中的应用

Synthesis of Highly Luminescent Carbon Dots@Polyacrylate Sodium Composites with High Loading Fraction and Their Application in Light-Emitting Diodes

将绿光碳纳米点(g-CDs)水溶液与聚丙烯酸钠(PAAS)复合,制备了具有高荧光量子效率的(g-CDs@PAAS)复合材料.PAAS因具有大量羧基基团而具有强吸水性,能与g-CDs表面大量的羧基、羟基及氨基基团产生氢键作用,使g-CDs在复合材料中维持单分散状态,有效地克服了g-CDs在固态下因聚集而引发的荧光猝灭问题.这种复合方法操作简单,制备过程中原材料无损失,g-CDs负载量高达30%的发光复合材料的荧光量子效率为52%.此外,g-CDs@PAAS复合材料具有良好的热稳定性、光稳定性和耐有机溶剂等特点,可作为颜色转换层应用于白光发光二极管.

Luminescent materials have wide application prospects in many fields,and hence they have drawn increasing attention. In this work,carbon dots( g-CDs) and polyacrylate sodium( PAAS) were used as raw materials. By combining g-CDs aqueous solution with PAAS,a luminescent composites( g-CDs@ PAAS) was obtained. Because the PAAS has a large number of carboxyl group and strong water imbibition thereof,while there are lots of carboxyl,hydroxyl and amino groups on g-CDs surface,leading to the combination of PAAS with g-CDs through hydrogen bonding interaction. In the as-prepared composites, g-CDs maintain monodisperse,which effectively overcomes the aggregation-induced solid-state luminescence quenching of g-CDs. This synthetic method is simple to operate and has no loss of raw materials during the preparation. The loading g-CDs fraction in g-CDs@PAAS is up to 30%,and its photoluminescence quantum yields could achieve 52%. In addition,the g-CDs@PAAS composites have good thermal stability,photostability,and organic solvent resistance. These advantages ensure that g-CDs@PAAS composites can be used as the color conversion layer in the manufacturing of white light-emitting diode.