Thermal and optical characterization of up-converting thermographic phosphor polymer composite films
| Autor: | Firouzeh Sabri, Josh Collins, Howard Bell, Stephen W. Allison, Makunda Aryal |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Infrared Mechanical Engineering Doping Phosphor Aerogel 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics medicine.disease_cause 01 natural sciences Temperature measurement 0104 chemical sciences Mechanics of Materials medicine Optoelectronics General Materials Science 0210 nano-technology Luminescence business Absorption (electromagnetic radiation) Ultraviolet |
| Zdroj: | MRS Advances. 3:3489-3494 |
| ISSN: | 2059-8521 |
| DOI: | 10.1557/adv.2018.486 |
| Popis: | Up-converting thermographic phosphors are of significant interest due to specific advantages for temperature measurement applications over traditional contact-based methods. Typically, infrared excitation stimulates visible fluorescence only from the target phosphor and not the surrounding medium. This is in contrast to ultraviolet excitation which may also produce interfering luminescence from cells and other biological tissue in the vicinity, for instance. When traversing a material, usually infrared losses due to scattering and absorption are less than for ultraviolet wavelengths. An example is human skin. This investigation follows logically from earlier efforts incorporating thermographic phosphors into elastomers and aerogels and their function as a reusable temperature sensor has been previously demonstrated by the authors. Layered phosphor/PDMS/aerogel composites are also currently under investigation by the authors for heat flux sensing. For maximum utility and understanding; physical, optical and thermal properties are characterized over a wide range of temperatures. Y2O2S:Yb,Er and La2O2S:Yb,Er up-converting phosphor composites with a fixed doping concentration were synthesized for this study and fully characterized as a function of temperature. The excitation/ emission characteristics of the powder alone and the prepared composites were investigated between -50 ˚C and +200 ˚C in an environmental chamber and the decay behavior of each sample type was measured. Here, the authors report on decay behavior and emission intensity of the PDMS composites as a function of temperature. Results were compared with powder –only parameters and are reported here. |
| Databáze: | OpenAIRE |
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