A novel blue emitting europium doped lanthanum magnesium hexaaluminate long persistent phosphor and analysis of traps distribution

• Published in: Journal of luminescence 2022-03, Vol.243, p.118671, Article 118671
• Main Authors: Yu, Jing, Luo, Xingliang, Wang, Ziqi, Yu, Shuaishuai, Wu, Junxiao, Li, Ming, Li, Xinyu, Tang, Tao, Wen, Jianfeng, Zhao, Lei
• Format: Article
• Language: English
• Subjects: Blue LPL; Eu2; LaMgAl11O19; Traps
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2021.118671

Long persistent luminescent (LPL) materials are highly anti attention due to its energy conservation and environmental protection. Here, a novel blue LPL material LaMgAl11O19: Eu2+ (LMAO: Eu2+) have been synthesized successfully by high temperature solid state method, and its LPL properties was studied for the first time. The X-ray diffraction, refinement and crystal structure were used to characterize the phase composition of the synthesized samples. The LMAO: Eu2+ phosphor mainly exhibits blue center at 454 nm, which was mainly attributed to the 5 d-4f transition of Eu2+. The LPL properties were characterized by the LPL decay curves, LPL spectrum and the thermoluminescence (TL) curves. After removing the excitation sourc e, a blue LPL is produced approximately 9 min. Finally, the trap distribution and LPL mechanism are analyzed in detail through TL spectroscopy. •A novel blue LPL phosphor LaMgAl11O19: Eu2+ was developed sucessfully.•The optimal LPL time was more than 9 min.•The traps distribution was discussed in depth by TL analysis.