Visible to Near‐Infrared Persistent Luminescence and Mechanoluminescence from Pr3+‐Doped LiGa5O8 for Energy Storage and Bioimaging
Visible to Near‐Infrared Persistent Luminescence and Mechanoluminescence from Pr3+‐Doped LiGa5O8 for Energy Storage and Bioimaging
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DOI：
10.1002/adom.201901107
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发表时间：
2019-09
影响因子：
9
通讯作者：
P. Xiong;M. Peng;Kexin Qin;Feifei Xu;Xingyi Xu
中科院分区：
文献类型：
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作者：
P. Xiong;M. Peng;Kexin Qin;Feifei Xu;Xingyi Xu
在此，报道了一种新型的 Li1−xGa5O8:xPr3+ 多功能荧光粉。对晶体结构、机械发光（ML）、持久发光（PersL）、光致发光（PL）和光致发光激发（PLE）进行了系统研究。 LiGa5O8在254 nm灯照射10 s后发出蓝色PersL，峰值在437 nm，肉眼可以观察到相应的PersL 30 min。在同一情况下，Li0.995Ga5O8:0.005Pr3+ 的 PersL 覆盖可见光至近红外光 (400–1000 nm)，可持续 120 分钟。热致发光分析表明，Pr3+掺杂不仅使浅陷阱（0.73 eV）浓度增加至少20倍，而且有助于形成更深的陷阱中心（0.87 eV）。 ML 和 PersL 光谱之间的差异揭示了机械刺激对 Pr3+ 离子跃迁的选择性影响。最终，智能PersL快速响应码（QR码）的制作允许在254 nm灯照射后写入光学信息，然后可以通过热刺激读出“SCUT”的加密信息，这显示了信息存储的潜力。此外，还进行了生物组织穿透实验和细胞毒性测试，展示了PersL在生物成像方面的潜力。
Here, a novel multifunctional phosphor of Li1−xGa5O8:xPr3+ is reported. The crystal structure, mechanoluminescence (ML), persistent luminescence (PersL), photoluminescence (PL) and photoluminescence excitation (PLE) are systematically studied. LiGa5O8 emits blue PersL peaked at 437 nm after irradiation by a 254 nm lamp for 10 s, and corresponding PersL can be observed for 30 min by naked eyes. In the same case, the PersL from Li0.995Ga5O8:0.005Pr3+ covers visible to near‐infrared lights (400–1000 nm) which can persist for 120 min. Thermoluminescence analysis shows Pr3+ doping not only increases the shallower trap (0.73 eV) concentration by at least 20 times but also helps the formation of deeper trap centers (0.87 eV). The differences between ML and PersL spectra reveal the selective effects of mechanical stimuli on the transitions of Pr3+ ions. In the end, the fabrication of an intelligent PersL quick response code (QR‐code) permits optical information write‐in after irradiation by a 254 nm lamp and then cryptical information of “SCUT” can be read out by thermal stimulation which shows the potential in information storage. Moreover, the biological tissues penetration experiments and cytotoxicity tests are carried out to display the potential of PersL in bioimaging.