Unleashing the Potential of Defect Engineered Persistent Pr3+‐Activated Phosphors for Multi‐Dimensional Anti‐Counterfeiting and X‐Ray Imaging Applications DOI Creative Commons
Annu Balhara, Santosh K. Gupta, P. S. Ghosh

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Abstract Persistent luminescence (PersL) in inorganic phosphors offers great potential for anti‐counterfeiting and optical storage, with optimization of PersL, multicolor tuning, defect engineering. This study presents a Ca 3 Ga 2 Ge O 12: Pr 3+ (CGGO:Pr) phosphor long‐lasting PersL emissions. Aliovalent codoping Er Yb ions optimizes deep/shallow trap redistribution, controlling depths from 0.98 to optimal 0.73 eV through the creation new shallow electron traps (Yb • , ) alongside existing V levels. The smart /Er /Yb :CGGO exhibits three‐dimensional visible emissions under 275 380 nm excitation, as well upconversion 980 laser irradiation. Hybrid density functional calculations, thermoluminescence, positron annihilation lifetime spectroscopy revealed nature different PersL. Together, single system featuring has been developed, exhibiting improved regulated (≈0.73 eV) suitable robust multimodal documents, pharmaceuticals, industrial products. Furthermore, composite PMMA‐CGGO:Pr films have shown remarkable capability X‐ray imaging, achieving resolution 4 lp/mm, which exceeds that commercial Gd S:Tb screens. These findings highlight this work advanced imaging applications, offering enhanced controlled depths.

Language: Английский

Unleashing the Potential of Defect Engineered Persistent Pr3+‐Activated Phosphors for Multi‐Dimensional Anti‐Counterfeiting and X‐Ray Imaging Applications DOI Creative Commons
Annu Balhara, Santosh K. Gupta, P. S. Ghosh

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Abstract Persistent luminescence (PersL) in inorganic phosphors offers great potential for anti‐counterfeiting and optical storage, with optimization of PersL, multicolor tuning, defect engineering. This study presents a Ca 3 Ga 2 Ge O 12: Pr 3+ (CGGO:Pr) phosphor long‐lasting PersL emissions. Aliovalent codoping Er Yb ions optimizes deep/shallow trap redistribution, controlling depths from 0.98 to optimal 0.73 eV through the creation new shallow electron traps (Yb • , ) alongside existing V levels. The smart /Er /Yb :CGGO exhibits three‐dimensional visible emissions under 275 380 nm excitation, as well upconversion 980 laser irradiation. Hybrid density functional calculations, thermoluminescence, positron annihilation lifetime spectroscopy revealed nature different PersL. Together, single system featuring has been developed, exhibiting improved regulated (≈0.73 eV) suitable robust multimodal documents, pharmaceuticals, industrial products. Furthermore, composite PMMA‐CGGO:Pr films have shown remarkable capability X‐ray imaging, achieving resolution 4 lp/mm, which exceeds that commercial Gd S:Tb screens. These findings highlight this work advanced imaging applications, offering enhanced controlled depths.

Language: Английский

Citations

0