NIR dual-mode temperature sensor based on FIR technology in BaYF5: Nd3+/Yb3+

Abstract

Near-infrared (NIR) temperature sensor based on fluorescence intensity ratio (FIR) has preeminent superiority in biological tissue. Here, NIR region temperature nano-sensors BaYF 5 : Nd 3+ /Yb 3+ were designed according to the FIR of 4 F 3/2 (I)→ 4 I 9/2 / 4 F 3/2 (II)→ 4 I 9/2 stark levels emission of Nd 3+ in 850–920 nm and 4 F 3/2 → 4 I 11/2 / 2 F 5/2 → 2 I 7/2 from the emissions of Nd 3+ /Yb 3+ in 950–1100 nm, in which the temperature detection of the former (sensor I) is based on the thermal coupling energy levels of Nd 3+ while the probe of Nd 3+ /Yb 3+ (sensor II) is non-thermally coupled energy levels. Hence, the sensor I using Boltzmann distribution theory and sensor II fitting of a polynomial were studied for the sensitivity. Furthermore, the temperature sensing performance of sensor I and sensor II of BaYF 5 : 1%Nd 3+ /10%Yb 3+ under 808 nm were also discussed. It is proved that NIR temperature sensing probes provide the possibility for application of temperature monitoring in bio-tissue. Double-mode NIR Temperature sensing probe located in BW based on BaYF 5 : Nd 3+ /Yb 3+ . • NIR Dual-mode temperature sensor BaYF 5 : Nd 3+ /Yb 3+ was designed. • Its sensing behavior based on FIR of 4 F 3/2 (I/II). → 4 I 9/2 (850–920 nm) (Nd 3+ , senor I), and Nd 3+ ( 4 F 3/2 → 4 I 11/2 , 1050 nm) and Yb 3+ ( 2 F 5/2 → 2 F 7/2 , 975 nm) (sensor II). • The NIR probes have good biological penetration and application prospect in biological diagnosis and treatment.