Influence of alkali and alkaline earth metal ion doping on the optical and thermal properties of Yb 3+ /Ho 3+ co-doped NaBi(MoO 4 ) 2 single crystals
Year: 2025
Type: article
Abstract: The influence of alkali and alkaline earth metal ion doping on the upconversion (UC) luminescence properties of Yb 3+ , Ho 3+ co-doped NaBi(MoO 4 ) 2 (NBM) single crystals was systematically investigated. A series of Yb 3+ , Ho 3+ :NBM single crystals doped with Li + , K + , and Ca 2+ ions were successfully grown using the Czochralski method. Their structural characteristics were analyzed through x-ray diffraction (XRD), transmission spectroscopy, and scanning electron microscopy (SEM), confirming a tetragonal crystal structure with space group I 4 1 / a . Under 980 nm and 450 nm laser excitation, the crystals exhibited distinct UC emission profiles, with dominant red and green emissions, respectively. Tauc plot analysis indicated that Ca 2+ doping introduced donor levels within the crystal lattice, effectively narrowing the optical bandgap. Power-dependent luminescence studies revealed that both red and green UC emissions originated from two-photon excitation processes. Temperature-dependent photoluminescence measurements under both excitation wavelengths demonstrated that co-doping with Li + , K + , and Ca 2+ significantly enhanced the thermal stability of the luminescent properties. Furthermore, variable-temperature fluorescence lifetime analyses showed that alkali and alkaline earth metal ion doping effectively mitigated the luminescence lifetimes. Overall, the incorporation of Li + , K + , and Ca 2+ ions was found to markedly improve both the UC luminescence intensity and thermal robustness of Yb 3+ , Ho 3+ :NBM single crystals, offering promising prospects for high-performance luminescent materials.
Source: Chinese Physics B
Authors: Wenzhi 文志 Su 宿, Kaiming 恺铭 Kan 阚, Chuancheng 传成 Zhang 张, Yong 勇 Zou 邹, Shoujun 守军 Ding 丁, Qingli 庆礼 Zhang 张
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,500
OpenAlex ID: W4415145408