文献类型：期刊文献

英文题名：Bandgap Engineering of Scandium Microspheres for Anti-Counterfeiting and Multicolor Imaging

作者：Chen, Bin Bin[1,2];Wang, Yue[1];Liu, Meng Li[2,3];Chang, Shuai[1];Lv, Jian[1];Gao, Ya Ting[1];Li, Da Wei[1]

机构：[1]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Chem & Mol Engn, Key Lab Adv Mat,Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]Chinese Univ Hong Kong, Shenzhen Inst Aggregate Sci & Technol, Sch Sci & Engn, 2001 Longxiang Blvd, Shenzhen 518172, Guangdong, Peoples R China;[3]Chinese Univ Hong Kong, Dept Affiliated Hosp 2, Longgang Dist Peoples Hosp Shenzhen, Sch Med, Shenzhen 518172, Guangdong, Peoples R China

年份：2023

卷号：11

期号：9

外文期刊名：ADVANCED OPTICAL MATERIALS

收录：;EI(收录号：20230813627574);WOS:【SCI-EXPANDED(收录号:WOS:000937703500001)】；

基金：Acknowledgements The authors appreciate the financial support from the National Natural Science Foundation of China (21788102, 21974046, 22176058, and 21977031), the Science and Technology Commission of Shanghai Municipality (19391901700, 19520744000, and 19ZR1472300), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：anti-counterfeiting; bandgap engineering; multicolor imaging; photothermal conversion; room-temperature phosphorescence; scandium microspheres

摘要：Bandgap engineering plays an important role in the regulation of the photophysical properties of semiconductor materials. Developing the facile and powerful strategy to achieve bandgap tunability is highly desired. Herein, the bandgap tunability of scandium microspheres prepared by the hydrothermal treatment of Sc3+ ions/l-glutamine (Sc3+/Gln) complexes is achieved. The continuously decreased bandgap is directly attributed to the increase of carbon element and the decrease of scandium element in scandium microspheres controlled by the Gln ligand, which causes the red-shifted room temperature phosphorescence from Sc/Gln-0.15 (3.17 eV, green) to Sc/Gln-0.25 (2.53 eV, yellow). Meanwhile, scandium microspheres have an excitation-dependent emission ranged from green to red color, revealing their multi-color imaging capability. Further increase of Gln ligand can further reduce the bandgap to 1.62 eV (Sc/Gln-0.3), realizing the transition from photoluminescence to photothermal properties of scandium microspheres. Because of their superior optical properties, scandium microspheres can be well used for advanced anti-counterfeiting and multicolor imaging. This new finding not only offers a deeper insight into the photophysical structure of rare earth semiconductor materials, but also provides a scalable method for the preparation of scandium microspheres with the desired bandgaps.