Novel spectral band: ultraviolet A mechanoluminescence from Bi3+-doped LiYGeO4

作者：Shao, Peishan; Xiong, Puxian^*; Xiao, Yao; Chen, Qianyi; Sun, Yongsheng; Yan, Na; Chen, Dongdan^*; Yang, Zhongmin

来源：Journal of Materials Chemistry C, 2022.

DOI：10.1039/d2tc03585e

• NEAR-INFRARED MECHANOLUMINESCENCE
• LUMINESCENCE
• PERSISTENT
• STRESS
• ND3+

Mechanoluminescent (ML) materials, which can emit light under external mechanical stimuli, have attracted much interest in diverse applications such as stress sensing, anti-counterfeiting and 3D signatures. However, ML materials located within the ultraviolet (UV) spectral range are still limited. In this study, a series of LixY0.995GeO4:0.005Bi(3+) (0.898 <= x <= 1.003) samples are synthesized by a high temperature solid-state reaction method. The crystal structure, ML, persistent luminescence (PersL) and photoluminescence (PL) are systematically studied. The excellent UVA PersL of LiYGeO4:Bi3+ can be ascribed to the existence of abundant trap sites created by the intentional loss of Li+ ions, which can improve the ML properties of the phosphors. This excellent material can make up for the deficiency of PersL materials in the UVA region (315-450 nm), and it may greatly expand the application of ML materials in the biomedical, energy and catalysis fields.