Up-conversion luminescence polarization control in Er<sup>3+</sup>-doped NaYF<sub>4</sub> nanocrystals

Up-conversion luminescence polarization control in Er³⁺-doped NaYF₄ nanocrystals

Zhang Hui¹, Yao Yun-Hua², Zhang Shi-An^{2, †,}, Lu Chen-Hui³, Sun Zhen-Rong²

The UV-VIS-IR absorption (a) of the glass ceramic containing Er³⁺:NaYF₄ nanocrystals and UC luminescence spectrum (b) of the sample excited by 800-nm femtosecond laser with a repetition rate of 1 kHz.