La2O3, Y2O3, ZrO2, and MgO+TEOS were added as the sintering aid to prepare Yb3+:Y3Al5O12 transparent ceramics. Pre-calcination was adopted to improve the crystalline quality and morphology of the commercially available Y2O3 raw powders. The non-stoichiometricaly doped La2O3, Y2O3, and ZrO2 enhanced the grain boundary mobility so fast that
abnormal grain growth occurred and pores tended to be enclosed in these grains. It was found that MgO+TEOS had a
positive effect on full densification of the Yb:YAG ceramics. The grain boundaries moved moderately so that pores could
be eliminated well and meanwhile the grains would not get too large.
Laser output experiment was also carried out for the Yb:YAG transparent ceramics.
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 °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 μm. The optical transmittance of the ceramic achieved 76.3 % at 1 μm. The PL spectra at room temperature and low temperature were measured under 361 nm excitation. The ~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.
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