High-Quantum-Efficiency Pr3+-Doped Li7La3Zr2O12 Garnet and Associated Temperature-Sensing Performance
Year: 2024
Type: article
Abstract: The understanding of energy transfer mechanisms between different excited states of Pr 3+ is closely bound up with exploiting high-quantum-efficiency Pr 3+ -doped luminescent thermometers and optimizing their temperature-sensing performances. Herein, we propose a new-type Pr 3+ -doped tetragonal-phase Li 7 La 3 Zr 2 O 12 (Pr 3+:LLZO) garnet luminescent thermometer and study accompanied photoluminescence (PL) properties. Combining composition optimization, we gain a fantastic room-temperature PL quantum efficiency within Pr 3+:LLZO phosphors (77.48%), a value obviously superior to those of traditional Pr 3+ -doped garnet-type phosphors. The thermally induced fluorescence quenching of 3 P 0 emissions within Pr 3+:LLZO mainly originates from phonon-assisted thermal ionization, differing from the Pr 3+ -doped Y 3 Al 5 O 12 garnet. By contrast, the 1 D 2 case is akin to most Pr 3+ -doped materials in that the quenching behavior is seriously associated with the cross-relaxation between the 3 P 0 and 1 D 2 states. On that basis, we propose a Pr 3+:LLZO luminescence thermometry strategy by utilizing different quenching mechanisms of steady-state 3 P 0 and 1 D 2 emissions, performing a comparable temperature-sensing capability to those Pr 3+ -based garnet-type luminescent thermometers. Our findings strengthen the importance of discerning the quenching mechanisms of Pr 3+ emissions and provide a valuable perspective for designing high-quantum-efficiency Pr 3+ -doped garnet-type luminescent materials and relevant luminescence thermometry.
Source: Inorganic Chemistry
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Awards: G1112757622, G3218667688, G703554420
OpenAlex ID: W4405588932