1 北京理工大学物理学院, 北京 100081
2 宝瑞激光科技(常州)有限公司, 江苏 常州 213000
基于激光诱导击穿光谱(LIBS)对铁矿石、锰矿石和铬矿石中的Fe元素进行定量分析。由于矿石成分复杂,采取一系列的光谱预处理来降低由激光能量波动及样品不稳定烧蚀所造成的光谱波动。本文将分类和定量分析方法结合,首先通过支持向量机对光谱进行分类以避免不同类矿石间的基体效应。然后通过相关性变量筛选偏最小二乘回归分析(R-PLS)改进算法进行分析,发现三类矿石的预测集方均根误差分别降至0.975%、0.418%、0.123%,平均相对误差分别降至1.46%、6.72%和1.09%。实验结果表明,矿石分类后再进行相关性变量筛选偏最小二乘回归分析的方法可以有效提升预测准确度,为矿石成分在线检测的应用提供了可靠依据。
光谱学 激光诱导击穿光谱 矿石 定量分析 偏最小二乘回归 主成分分析 支持向量机 中国激光
2021, 48(16): 1611002
Author Affiliations
Abstract
1 Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
2 Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
3 AICFVE of Beijing Film Academy, Beijing 100088, China
4 e-mail: liusir@bit.edu.cn
Lead halide perovskites have drawn extensive attention over recent decades owing to their outstanding photoelectric performances. However, their toxicity and instability are big issues that need to be solved for further commercialization. Herein, we adopt a facile dry ball milling method to synthesize lead-free (, Cl) perovskites with photoluminescence (PL) quantum yield up to 60%. The optical features including broad emission spectrum, large Stokes shift, and long PL lifetime can be attributed to self-trapped exciton recombination. The as-synthesized blue emissive and green emissive lead-free perovskite powders have good thermal stability and photostability. Furthermore, UV-pumped phosphor-converted light-emitting diodes were obtained by using and as phosphors.
Photonics Research
2020, 8(6): 06000768
