A Pr3+ doping strategy for simultaneously optimizing the size and near infrared persistent luminescence of ZGGO:Cr3+ nanoparticles for potential bio-imaging

作者：Gong, Zheng; Liu, Yuxue^*; Yang, Jian; Yan, Duanting; Zhu, Hancheng; Liu, Chunguang; Xu, Changshan; Zhang, Hong^*

来源：Physical Chemistry Chemical Physics, 2017, 19(36): 24513-24521.

DOI：10.1039/c7cp02909h

• ZINC GALLOGERMANATE NANOPARTICLES
• VISIBLE-LIGHT
• TRAP DEPTH
• PHOSPHORS
• RED
• EMISSION
• IMPROVEMENT
• BRIGHTNESS
• GALLATE
• STORAGE

Spinel-phase Zn2Ga2.98-xGe0.75O8:Cr-0.020, Pr-x (ZGGO:Cr3+, Pr3+) near infrared (NIR) persistent luminescence nanoparticles (PLNPs) with different amounts of Pr3+ dopant were prepared by a hydrothermal method in combination with a subsequent annealing in a vacuum. For these nanoparticles, the averaged particle size decreases from 64 to 37 nm with increasing Pr3+ doping concentration from 0 to 0.025 and Cr3+ and Pr3+ ions are uniformly doped into the interior and surface of a single nanoparticle. It can be found that Pr3+ doping leads to the appearance of more anti-site pairs (Ga-Zn degrees - Zn-Ga') around distorted octahedral Cr3+ ions and enhanced NIR emissions around 697 nm, which originate from the E-2((2)G) -> (4)A(2)(F-4) and T-4(2)(F-4) -> (4)A(2)(F-4) transitions of the interior and surface Cr3+ ions in the nanoparticles. In particular, for the interior Cr3+ ions in the Pr3+ doped nanoparticles, the enhanced NIR luminescence can be attributed to the suppressed energy transfer of the excited electrons from the T-4(2)(F-4) level to the trap level related to anti-site pairs (Ga-Zn degrees - Zn-Ga') around the distorted octahedral Cr3+ ions. Our results suggest that Pr3+ doped ZGGO:Cr3+ PLNPs have potential applications for bio-imaging.

• 出版日期2017-9-28
• 单位东北师范大学