Optical absorption and thermionic emission mechanism of multi-functional La1–x Srx B6 hexaborides | Zendy

Hongyan Zhang | Zendy; Lihong Bao | Zendy; Luomeng Chao | Zendy; Fengqi Zhao | Zendy; Zizhong Liu | Zendy

Open Access

Optical absorption and thermionic emission mechanism of multi-functional La1–x Srx B6 hexaborides

Author(s) -

Hongyan Zhang,

Lihong Bao,

Luomeng Chao,

Fengqi Zhao,

Zizhong Liu

Publication year - 2021

Publication title -

acta physica sinica

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.

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