Qiang, Qinping Wang, Yuhua Table_1_Effect of Mn2+ on Upconversion Emission, Thermal Sensing and Optical Heater Behavior of Yb3+ - Er3+ Codoped NaGdF4 Nanophosphors.DOCX <p>In thiswork, we investigate the influence of Mn<sup>2+</sup> on the emission color, thermal sensing and optical heater behavior of NaGdF<sub>4</sub>: Yb/Er nanophosphors, which the nanoparticles were synthesized by a hydrothermal method using oleic acid as both a stabilizing and a chelating agent. The morphology and crystal size of upconversion nano particles (UCNPs) can be effectively controlled through the addition of Mn<sup>2+</sup> dopant contents in NaGdF<sub>4</sub>: Yb/Er system. Moreover, an enhancement in overall UCL spectra of Mn<sup>2+</sup> doped UCNPs for NaGdF<sub>4</sub> host compared to the UCNPs is observed, which results from a closed back-energy transfer between Er<sup>3+</sup> and Mn<sup>2+</sup> ions (<sup>4</sup>S<sub>3/2</sub> (Er<sup>3+</sup>) → <sup>4</sup>T<sub>1</sub> (Mn<sup>2+</sup>) → <sup>4</sup>F<sub>9/2</sub> (Er<sup>3+</sup>)). The temperature sensitivity of NaGdF<sub>4</sub>:Yb<sup>3+</sup>/Er<sup>3+</sup> doping with Mn<sup>2+</sup> based on thermally coupled levels (<sup>2</sup>H<sub>11/2</sub> and <sup>4</sup>S<sub>3/2</sub>) of Er<sup>3+</sup> is similar to that particles without Mn<sup>2+</sup> in the 303–548 K range. And the maximum sensitivity is 0.0043 K<sup>−1</sup> at 523 K for NaGdF<sub>4</sub>:Yb<sup>3+</sup>/Er<sup>3+</sup>/Mn<sup>2+</sup>. Interestingly, the NaGdF<sub>4</sub>:Yb<sup>3+</sup>/Er<sup>3+</sup>/Mn<sup>2+</sup> shows preferable optical heating behavior, which is reaching a large value of 50 K. These results indicate that inducing of Mn<sup>2+</sup> ions in NaGdF<sub>4</sub>:Yb<sup>3+</sup>/Er<sup>3+</sup> nanophosphors has potential in colorful display, temperature sensor.</p> NaGdF4:Yb3+/Er3+;Mn2+;upconversion luminescence;temperature sensing;optical heater 2019-06-06
    https://frontiersin.figshare.com/articles/dataset/Table_1_Effect_of_Mn2_on_Upconversion_Emission_Thermal_Sensing_and_Optical_Heater_Behavior_of_Yb3_-_Er3_Codoped_NaGdF4_Nanophosphors_DOCX/8234330
10.3389/fchem.2019.00425.s001