In Situ Formation of Ultrathin Composite Shell with Strong Water Resistance on the Surface of K2SiF6:Mn4+ via NaClO Treatment

• DOI: 10.1002/adom.202401498
• Publication Date: 2024-07-22T11:30:17Z
• Authors: Tianman Wang; Lin Wang; Weiyue Gao; Henghuan Ruan; Jun Lei; Yuelan Li; Sen Liao; Yingheng Huang
• Keywords: 0210 nano-technology; 0104 chemical sciences

Abstract Solving the problem of poor weather resistance Mn 4+ ‐doped fluoride phosphors is pivotal for their application in white‐light‐emitting diodes (WLEDs). This study introduces a one‐step synthesis strategy phosphor T‐KSF:Mn (KSF:M = K 2 SiF 6 :Mn and T surface‐treated with NaClO) that involves use NaClO solution as treatment agent to augment water this phosphor. The results transmission electron microscopy, diffraction tomography, X‐ray photoelectron spectroscopy, analyses reveal formation an ultrathin composite shell (<5 nm) comprising KNaSiF on surface T‐KSF:Mn. fluorescence intensity treated 1.09 times untreated phosphor, its internal quantum efficiency reaches 82.72%. Even after 60 days testing harsh hydrolysis environment, remains at 86.24%. At 150 200 °C, integrated surge 256.84% 292.29% initial value 30 respectively, demonstrating substantial negative thermal quenching (NTQ) effect. Furthermore, aging tests conducted 85 °C 85% relative humidity substantiate effectiveness aforementioned considerably enhancing WLED stability under practical conditions.