双壳层包覆Mn∶CsPbCl_(3)纳米晶制备及潜指纹识别应用  

Synthesis of Double-layer Coated Mn∶CsPbCl_(3)Nanocrystals and Their Application of Latent Fingerprint Identification

作　　者：张力夫 陈刚 闫奥 张瑞 吕泽华 蒋昭毅 张宇飞 孟帅 李坤[1] 秦振兴 宋凯 ZHANG Lifu;CHEN Gang;YAN Ao;ZHANG Rui;LYU Zehua;JIANG Zhaoyi;ZHANG Yufei;MENG Shuai;LI Kun;QIN Zhenxing;SONG Kai(School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学应用科学学院,山西太原030024

出　　处：《发光学报》2023年第12期2211-2221,共11页Chinese Journal of Luminescence

基　　金：山西省自然科学基金(20210302123221,202203021221146,202103021224268,202203021222207);山西省科技创新人才团队专项资助(202204051001002)。

摘　　要：全无机卤化铅铯钙钛矿纳米晶CsPbX_(3)(X=Cl,Br,I)因具有独特的光电特性,近年来在固体照明及显示、太阳能电池、阻变存储器等领域成为研究的热门之选。Mn^(2+)是一种比Pb^(2+)半径小的过渡金属离子,利用Mn^(2+)掺杂CsPbCl_(3)钙钛矿纳米晶能够实现波长位于600 nm左右可见光区域的橘黄色发射,且能够部分替代钙钛矿纳米晶中的Pb^(2+),降低钙钛矿纳米晶的毒性。然而,Mn^(2+)掺杂的卤化物钙钛矿纳米晶仍易受环境中水分子等的侵蚀而导致其荧光特性严重退化。本文采用一种利用四甲氧基硅烷(Tetramethoxysilane,TMOS)和聚甲基丙烯酸甲酯(Polymethyl methacrylate,PMMA)对Mn^(2+)掺杂CsPbCl_(3)钙钛矿纳米晶进行双壳层的包覆方法,并分析了双壳层包覆法对钙钛矿纳米晶稳定性提升的机理。此外,还对比了双壳层包覆的Mn^(2+)掺杂CsPbCl_(3)钙钛矿纳米晶在甲苯和二氯甲烷(Dichloromethane,DCM)溶剂下的发光特性,它们呈现的橘黄色荧光发射强度并未明显下降,且荧光量子产率(Photoluminescence quantum yield,PLQY)能够保持在25%左右。并以此为基础制备了相应的荧光纳米晶粉末,将其运用于潜指纹辨识上,可长期有效地检测潜指纹信息。All inorganic lead cesium halide perovskite nanocrystal CsPbX_(3)(X=Cl,Br,I)has become attractive candidate in solid state lighting and display,solar cells,resistive memory and other fields due to its unique photoelectric characteristics.Mn^(2+)-doped CsPbCl_(3)perovskite nanocrystals could achieve orange emission at the wavelength of around 600 nm,where Mn^(2+)with a small radius can partially replace Pb^(2+)to reduce toxicity.However,Mn^(2+)-doped halide perovskite nanocrystals are still susceptible to the erosion of water molecules in the environment,leading to the severe degradation of their fluorescence properties.Herein,a double-layer coating method was adopted for Mn^(2+)-doped CsPbCl_(3)using TMOS and PMMA,and the mechanism of improving the stability of perovskite nanocrystals by the double-layer coating method was also analyzed.Furthermore,the luminescence properties of double-layer coated Mn^(2+)ion doped CsPbCl_(3)perovskite nanocrystals in toluene and dichloromethane solvents were compared.The orange Mn^(2+)emission intensity has not significantly reduced,and the photoluminescence quantum yield(PLQY)can be maintained at about 25%.Based on this,the corresponding luminescence nanocrystal powder was prepared and applied to latent fingerprint identification,which can effectively detect the latent fingerprint information for a long time.

关 键 词：Mn^(2+)掺杂 卤化物钙钛矿纳米晶 双壳层包覆 荧光粉末 潜指纹辨识 

分 类 号：O482.31[理学—固体物理]