绿色环保非镉量子点荧光膜的制备

Preparation of Environment-friendly Cadmium-free Quantum Dots Fluorescent Films

采用水热法,以硝酸铋、油胺、硫粉为原料制备Bi_2S_3量子点溶液,并用1,8-辛二胺与环氧树脂(聚乙二醇二缩水甘油醚)制备的基于Bi_2S_3量子点的发光薄膜。合成的Bi_2S_3量子点的初始发射波长为703 nm,产率为16.9%;通过荧光寿命的测试表明合成的Bi_2S_3量子点寿命为t_2=10.57 ns。FTIR测试结果表明,环氧树脂膜前聚体910 cm-1在固化后消失,由此表明,量子点添加环氧树脂后对聚合不产生影响。10%的量子点添加量时,其伸长率为12.7%,拉伸应力接近7.5 MPa。扫描电子显微镜(SEM)对所制备的样品的形貌进行分析,表明量子点薄膜内部无结构缺陷,说明量子点与环氧树脂融合较好;二胺的添加量对产物的机械性能具有明显的影响,当二胺与环氧树脂的物质的量比为1:1时,其伸长率为29.1%,拉伸应力为8.2 MPa。

Bismuthous sulfide （Bi2 S3 ） quantum dots （QDs） was produced by hydrothermal method with bismuth nitrate, oil amine and sulfur powder as raw materials. 1,8-symplectic diamine and epoxy resin （polyethylene glycol diglycidyl ether） were used to synthesize luminescent thin films based on Bi2S3 quantum dots. The synthesized QDs emission wavelength is 703 nm with the quantum yield of 16. 9% ; the test results of fluorescence lifetime show that the the vibration at 910 cm-1 disappears lifetime t2 is 10. 57 ns. Fourier transform spectroscopy results show that after curing of the epoxy resin precursor, which indicates that the QDs filler shows no effects on the resin curing. With 10% QDs loading in the epoxy resin film, the tensile strain is 12.7% and the stress is 7.5 MPa. Scanning electron microscope observations show that the inner structure is uniform with no defects, which indicates that the QDs can be well dispersed in the epoxy resin. The molar ratio of diamine to epoxy resin shows a great effect on the mechanical strength of the resultant product, and when the molar ratio is 1 ： 1, the tensile strain is 29.1% and the tensile stress is 8.2 MPa. These results are helpful for the preparation of green, environment-friendly flexible fluorescent films.