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

doi:10.7503/cjcu20190481

摘要/Abstract

摘要：

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.

关键词: 碳纳米点, 聚丙烯酸钠, 发光复合材料, 发光二极管

Abstract:

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.

Key words: Carbon dot, Polyacrylate sodium, Luminescent composite, Light-emitting diode

中图分类号:

TrendMD:

吴子杰,李鑫,李志伟,李迪,翟阅臣,周鼎,曲松楠. 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. 高等学校化学学报, 2019, 40(12): 2427.

Zijie WU,Xin LI,Zhiwei LI,Di LI,Yuechen ZHAI,Ding ZHOU,Songnan QU. Synthesis of Highly Luminescent Carbon Dots@Polyacrylate Sodium Composites with High Loading Fraction and Their Application in Light-Emitting Diodes ^†. Chem. J. Chinese Universities, 2019, 40(12): 2427.

图/表 9

Scheme 1 Schematics of g-CDs@PAAS composites preparation for WLED

Fig.1 Optical images for illustrating the preparation process of g-CDs@PAAS composites (A) Images of PAAS powders(left) and g-CDs aqueous solution(right) under sunlight; (B) after mixing the PAAS powders and g-CDs aqueous solution, the images of the mixtures under sunlight(left) and UV light(right); (C) after removing the solvent, the images of the g-CDs@PAAS composites under sunlight(C) and UV light(D).

Fig.2 Diffuse reflection absorption(a) and PL emission(b) spectra(A) and excitation-emission maps(B) of g-CDs@PAAS composites

Fig.3 Luminescence lifetime decay curves of g-CDs solution(a), g-CDs@PAAS composites(b) and IRF(c)

Table 1 Comparison of the PL lifetime of g-CDs solution and g-CDs@PAAS composites

Sample	τ₁/ns	A₁(%)	τ₂/ns	A₂(%)	τ_ave/ns	χ²
g-CDs solution	5.03	74.8	10.81	25.2	6.48	1.2
g-CDs@PAAS	3.98	15.3	12.34	84.7	11.06	1.3

Fig.4 HRTEM image(A), SEM image(B), EDS pattern(C) and XRD pattern(D) of g-CDs@PAAS composites

Fig.5 Evaluation of the photostability(A), the thermal stability(B), resistance to chloroform(C) and UV light(D) of g-CDs@PAAS composites a. Fluorescent dye; b. g-CDs@PAAS.

Fig.6 Images(A, B) and PL emission spectrum(C) of luminescent bulk materials composed of g-CDs@PAAS composites and epoxy-silicone resin

Fig.7 Images(A—C) and CIE chromaticity diagram(D) of working WLEDs with different CIE coordinates and color temperatures m(g-CDs@PAAS):m(epoxy-sclicone): (A) 1:5; (B) 2:5; (C) 3:5. Insets in (A—C) are the corresponding optical images and emission spectra. (D) m(g-CDs@PAAS):m(epoxy-silicone): a. 1:5; b. 2:5; c. 3:5.

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