Preparation and Characterization of Nanocrystalline ZrO_2:Yb~(3+),Er~(3+)Up-conversion Phosphors

摘要

Nanocrystalline up-converting phosphors with zirconium oxide (Zr02) as the host lattice wereprepared with combustion and sol-gel methods. Impurities were analyzed with Fourier transforminfrared (FT-IR) spectroscopy. Y133+ absorption was studied in the wave number region 10,000-11,500 cm~(-1) at room temperature and at 10 K. The whole-blood absorption was measured in theregion 9100-41,600 cm~(-1) at room temperature. Up-conversion luminescence was excited at roomtemperature with an IR-laser at 977 nm. The up-conversion luminescence spectra showed red (650- 685 nm) and green emission (520-560 nm) due to the ~4F_(9/2)→~4I~(15/2)and(~2H_(11/2), ~4S_(3/2))→~4I~(15/2)transitions of Er~(3+),respectively. The materials prepared with combustion synthesis were found to yield themost efficient up-conversion intensity and the longest luminescence decay.