https://scholars.lib.ntu.edu.tw/handle/123456789/606921
標題: | Simultaneous construction of impermeable dual-shell stabilizing fluoride phosphors for white light-emitting diodes | 作者: | Luo P Ye M Zhou W Wan P Ma Z Qiu Z Zhang J Liu R.-S Lian S. RU-SHI LIU |
關鍵字: | Core-Shell-Shell;Fluoride;Mn4+;Water Stability;White Light-Emitting Diodes;Fluorine compounds;Hydrogen bonds;Ketones;Manganese compounds;Molecules;Stability;Core shell;Core-shell-shell;Environmental factors;Materials stability;Pyruvic acid;Red-emitting;Water stability;White light emitting diodes;Shells (structures) | 公開日期: | 2022 | 卷: | 435 | 來源出版物: | Chemical Engineering Journal | 摘要: | The traditional strategy to improve material stability is to cover the surface with a shell to resist adverse environmental factors. For the red-emitting fluoride materials with easily hydrolyzed Mn4+ on the surface, many strategies have been reported with limited effectiveness. In this work, simultaneous construction of an impermeable dual-shell on Mn4+-doped fluoride is proposed to solve the instability problem by a simple pyruvic acid (PA) treatment. The internal quantum efficiency of the K2SiF6:Mn4+ with dual-shell can be optimized up to 99.71%, the photoluminescence intensity can maintain 88.5% of the original intensity after soaking in water for 360 h, and the body color is not changed even in boiling. The reduction effect of the PA solution builds a hard fluoride shell by removal of the surface Mn4+, and the hydrogen bonding effect of PA molecular leads to the formation of a soft organic shell. The dual-shell can effectively block the damage of fluoride by external water molecules and achieve a significant improvement in water stability. The dual effect of PA is derived from its special molecular structure containing α-ketone carbonyl and carboxyl groups. This hypothesis is supported by the results of the moisture resistance of fluoride-treated with a variety of solvents similar in molecular structure to PA. In addition, DFT calculations simulated various hydrogen bond structures that may be formed between PA molecules and fluoride surface atoms. ? 2022 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85124323020&doi=10.1016%2fj.cej.2022.134951&partnerID=40&md5=b22e141bb1f8dcc5a7742b6d5b666575 https://scholars.lib.ntu.edu.tw/handle/123456789/606921 |
ISSN: | 13858947 | DOI: | 10.1016/j.cej.2022.134951 |
顯示於: | 化學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。