Open AccessOptical absorption and thermionic emission mechanism of multi-functional La<sub>1–<i>x</i></sub> Sr<sub><i>x</i></sub> B<sub>6</sub> hexaborides
Author(s) -
内蒙古师范大学物理与电子信息学院,
内蒙古科技大学,
内蒙古师范大学化学与环境科学学院,
内蒙古师范大学
Publication year - 2021
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.70.20211069
Subject(s) - thermionic emission , analytical chemistry (journal) , doping , materials science , physics , chemistry , electron , quantum mechanics , optoelectronics , chromatography
The optical absorption property of the nanocrystalline La 1– x Sr x B 6 powder and thermionic emission property of the La 1– x Sr x B 6 polycrystalline bulk are investigated. As a result, the transmission wavelength of LaB 6 is red-shifted from 591 nm to 658 nm with the increase of Sr doping content. The emission tests indicate that the thermionic emission current density of La 1– x Sr x B 6 polycrystalline bulk increases from 2.3 A/cm 2 to 19.36 A/cm 2 with the increase of La doping content under an applied voltage of 2000 V. The first-principle calculation results reveal that Sr doping LaB 6 leads plasma frequency energy and Fermi level to decrease, resulting in the tunable characteristics of transmission wavelength and enhancement of thermionic emission. Therefore, the Sr-doped LaB 6 as a multifunctional ceramic has a potential application in the field of optical filter or becomes a promising cathode for microwave device.