文献类型：期刊文献

英文题名：Confinement Growth and Near-Infrared Broadband Luminescence of Pbs Quantum Dots in Mesoporous Glass

作者：Chen, Chunlin[1,2]; Jiang, Qi[1]; Jiang, Yiguang[2]; Li, Ao[1]; Chen, Zhuocheng[2,3]; Wang, Jingang[2]; Wang, Zan[2]; Zhang, Long[2]; Zeng, Huidan[1]

机构：[1] School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] CAS Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China; [3] School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, 200093, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220212105)

语种：英文

外文关键词：Aluminum compounds - Glass - Infrared devices - Lead compounds - Optical fibers - Photoluminescence - Red Shift - Semiconductor quantum dots - Silica - Silicates - Sodium compounds

摘要：Silicate glass doped with PbS quantum dots can efficiently shield quantum dots, hence enhancing their stability and achieving stable photoluminescence in the near-infrared band. As a result, researchers have taken a keen interest in glass containing quantum dots. However, the quantum dot glass will be impacted by the holding period, holding temperature, and solubility of doped ions in the glass matrix. Thus, the production process is fraught with obstacles. We developed mesoporous aluminosilicate glass doped with PbO via the sol-gel process and the mesoporous size of the glass samples is 2~10 nm. The PbO-doped mesoporous glass samples were then submerged in Na 2 S solution, whereupon PbS quantum dots precipitated rapidly. As PbO content increases, the ratio of Pb-S bond to S-C bond falls continuously, which is due to the limited mesopore space in the glass, resulting in excessive S 2- in the solution forming S-C bonds with the residual carbon in the mesoporous glass. PbS quantum dots in various sizes in the mesoporous glass exhibit ultra-wideband luminescence in the near-infrared band (1100 nm~1900 nm) when excited by light with a wavelength of 808 nm. Moreover, all photoluminescence (PL) spectra are separated due to the presence of hydroxyl groups in mesoporous glasses. Increasing the content of PbO in Al 2 O 3 -SiO 2 mesoporous glass from 0.2 mol% to 0.4 mol%, the central wavelength of the PL spectra will tend to red-shift. Nonetheless, with the content of PbO raised from 0.4 mol% to 0.8 mol%, the PL spectra will have a blue shift. The formation of PbS quantum dot crystals is controlled according to the size of the mesopore, which could be determined by the change in the center wavelength of the PL spectrum. For Al 2 O 3 -SiO 2 mesoporous glasses, PbS quantum dots are generated in situ through the solution method. The fabricated quantum dot glasses have potential applications in optoelectronic fields, such as infrared detectors and optical fiber communications. ? 2022, The Authors. All rights reserved.