State Key Lab for Advanced Metals and Materials, School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100083, China.
ACS Appl Mater Interfaces. 2017 Dec 20;9(50):44134-44145. doi: 10.1021/acsami.7b15612. Epub 2017 Dec 7.
Fluorescent micro- and nanosized particles have a broad range of applications in biology, medicine, and engineering. For these uses, the materials should have high emission efficiency and good photostability. However, many organic fluorophores suffer from aggregation-induced quenching effects and photobleaching. Here, we used a simple method based on covalently blending a fluorescent conjugated oligomer with silica nanoparticles to achieve emission quantum yields as high as 97%. The resulting system also showed excellent stability under continuous light illumination, in a range of pH values and temperatures, and in common solvents. This fluorescent material showed outstanding properties, including highly efficient blue emission, low cost, low toxicity, and easy synthesis. Furthermore, its effectiveness for latent fingerprint detection was demonstrated as a proof of concept on various substrates. The obtained emissive fingerprint powder gave good optical/fluorescent images with high contrast and resolution between the ridges and spaces.
荧光微纳米颗粒在生物学、医学和工程领域有广泛的应用。对于这些用途，材料应该具有高的发射效率和良好的光稳定性。然而，许多有机荧光团存在聚集诱导猝灭效应和光漂白。在这里，我们使用一种简单的方法，通过将荧光共轭低聚物共价键合到二氧化硅纳米颗粒上来实现高达 97%的发射量子产率。所得的体系在连续光照、各种 pH 值和温度以及常见溶剂下也表现出优异的稳定性。这种荧光材料具有高效蓝色发射、低成本、低毒性和易于合成等突出性能。此外，它在各种基质上作为潜在指纹检测的有效性也得到了证明。所得到的发荧光指纹粉末在脊和空间之间具有高对比度和分辨率的良好光学/荧光图像。
