SECONDMENTS

The combination of trivalent praseodymium (Pr3+) and ytterbium (Yb3+) ions within a vitreous matrix is an ingenious strategy to develop glasses for applications in photonics because it paves the way for multicolor light emission using different pathways. Emission in the visible spectral range can be achieved through upconversion, where lower energy near-infrared (NIR) excitation is converted to higher energy visible (VIS) emission using energy transfer processes from Yb3+ to Pr3+. Downconversion is also possible, with Pr3+ absorbing in the VIS region and transferring its energy to two Yb3+ emitting in the NIR. Additionally, typical downshifting emission from Pr3+ occurs through excitation in the blue spectral region with several emissions bands arising in the blue, green, orange, and red spectral regions. Oxyfluoride glasses are good candidates to host Yb3+ to Pr3+ because they combine the low phonon energies from fluoride nanocrystals (300 – 500 cm–1) with high chemical and thermal stability from oxide glasses. In this sense, this secondment is focused on the preparation of Pr3+-Yb3+ co-doped oxyfluoride glasses and the study of their thermal and optical properties.

• Preparation of oxyfluorides glasses
• Thermal characterization
• Investigation of photoluminescence properties

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Figure 1.    cccc

Going Above and Beyond: A Tenfold Gain in the Performance of Luminescence Thermometers Joining Multiparametric Sensing and Multiple Regression