Yufei Zhai,Song Li,Yuxuan Dong,Ying Jin,Xuanzheng Zhou,Min Wang
A luminescence quenching enhanced infrared (IR) detector has been developed to achieve highly sensitive recognition of human body by adding metallic luminescence quenchers. Spherical Ag NPs were mixed with Ru(phen) 3 2+ complex to obtain temperature-sensitive Ag/Ruphen/PVDF films. The relationships among luminescence output, temperature rise and silver addition were investigated and a satisfactory combination of enhanced luminescence factor and temperature change was found with an addition of 5 mol% of 71 nm Ag NPs. It is found that the metal-enhanced luminescence output is insignificant compared to its thermal ingredient since silver provides additional possible electron transfer channels, promoting non-radiative transitions and weakening luminescence. Besides, the Ag NPs induced additional temperature rise bringing further reduction of luminescence. The photothermal effect of Ag NPs can attain a higher temperature change under a certain IR radiation without an observed degradation of luminescence output. A coupled optical-thermal model was established to explain the schematic of the constructed infrared thermal detector. The non-invasive detections of moving and stationary human by the detector were successfully demonstrated. The work tends to provide an engineered optical-thermal model in luminophores and construct highly sensitive luminescence-based infrared thermal detectors.
The accurate temperature measurement with micrometric spatial resolution is difficult to acquire by using conventional contact thermal probes. Noncontact thermal probes possess great potential for future high resolution accurate temperature measurements. Herein, we report a thermometer based on Ruphen-based temperature sensitive paint (TSP) for high-sensitive remote temperature measurement. TSP consisting of Ruphen and PVDF with sharp emission band and high internal quantum efficiency was designed and employed to fabricate a luminescence thermometer prototype for infrared-to-visible converter in this study. The temperature dependent photoluminescence properties of the different Ruphen/PVDF films were analyzed in the range of 283 K to 363 K, and a relatively high thermal sensitivity (−4.3 %K −1 @ RT) was obtained for low Ruphen concentration sample. The as-fabricated temperature sensor prototype can detect a 623 K thermal object with a response time of 1.52 s and a noise equivalent temperature difference ( NETD ) of 2.40 K. Furthermore, the effect of IR absorber on the imaging performance was also investigated, and an optimized response time of 1.17 s and NETD of 1.68 K were observed. The results indicate that Ruphen/PVDF film is promising for a luminescence thermometer for room temperature mapping.
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