Investigation on the visible emission properties of Tm: Y2O3 transparent ceramic

With the purpose of investigation on the visible emission properties of Tm3+ ions, a Tm3+-doped Y2O3 transparent ceramic was fabricated by sintering at 1800 degrees C for 20 hour with a vacuum degree of 1x10(-3) Pa. 3 at% ZrO2 was introduced as the sintering aid and the average grain size was measured to be 22 mu m. The optical transmittance of the ceramic achieved 76.3 % at 1 mu m. The PL spectra at room temperature and low temperature were measured under 361 nm excitation. The similar to 453 nm emission bands were observed and the luminescence mechanisms were discussed. It was found that the Tm: Y2O3 transparent ceramic have the potential to be used in white LED packaging structure.