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Improved Photothermal Heating of NaNdFsub.4 Microcrystals via Low-Level Doping of Smsup.3+ for Thermal-Responsive Upconversion Luminescence Anti-Counterfeiting
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Improved Photothermal Heating of NaNdFsub.4 Microcrystals via Low-Level Doping of Smsup.3+ for Thermal-Responsive Upconversion Luminescence Anti-Counterfeiting
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Improved Photothermal Heating of NaNdFsub.4 Microcrystals via Low-Level Doping of Smsup.3+ for Thermal-Responsive Upconversion Luminescence Anti-Counterfeiting
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Journal Article
Improved Photothermal Heating of NaNdFsub.4 Microcrystals via Low-Level Doping of Smsup.3+ for Thermal-Responsive Upconversion Luminescence Anti-Counterfeiting
2024
Overview
This work reports the light-to-heat conversion (LHC) behavior of NaNdF[sub.4] doped with Sm[sup.3+]. Due to the cross-relaxation between Nd[sup.3+] and Sm[sup.3+], the improved LHC is obtainable by introducing 5% Sm[sup.3+]. When the laser power density is only 1.72 W/cm[sup.2], the spot temperature of NaNdF[sub.4]:5%Sm[sup.3+] powder reaches as high as 138.7 ± 4.04 °C. More importantly, the photoheating response to the pump laser has favorable linear characteristics within a specific power range. A simple physical model is applied to analyze the relationship between photothermal heating and pump power. Finally, the temperature-responsive luminescence anti-counterfeiting is designed by combining the LHC material with the NaYF[sub.4]:Yb[sup.3+]/Ho[sup.3+]/Ce[sup.3+] microcrystals. This novel strategy only requires two laser beams, and thus is more convenient to apply.
