1 research outputs found
Energy Transfer Mechanisms and Optical Thermometry of BaMgF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> Phosphor
Motivated from our
previous studies on the upconversion properties of BaMgF<sub>4</sub>:Yb<sup>3+</sup>,Tb<sup>3+</sup> phosphor, here we investigated the
upconversion properties of BaMgF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> phosphor. We demonstrate a two-way versatile approach for
the fine-tuning of emission from green to the red region, by varying
the dopant concentration and adjusting the pulse width of an infrared
laser. The mechanism involved in tuning the emission color by laser
power and pulse width variation was illustrated in detail. The temperature
dependent upconversion spectra were studied by analyzing the fluorescence
intensity ratio of the thermally coupled levels. The maximum sensitivity
obtained is 83.29 × 10<sup>–4</sup> K<sup>–1</sup> at 583 K, which is much higher than the temperature sensitivity
reported for other fluoride based materials. Moreover, the influence
of the excitation power density on the ability of the phosphor for
temperature sensing was also investigated. We obtained a maximum (∼415
K) temperature detection at 2563 mW laser power. The obtained results
illustrate the potential use of BaMgF<sub>4</sub>:Yb<sup>3+</sup>,Er<sup>3+</sup> phosphor in an optical thermometer due to its highly sensitive
temperature detection ability