Abstract
Porous Si3N4 ceramics with photoluminescence properties were prepared by pressureless sintering using a-Si3N4 powder as raw material and Eu2O3 as sintering additive. Chemical composition, phase formation, microstructure and photoluminescence properties of porous Si3N4 ceramics were studied by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence measurements (PL/PLE). The results show that single Eu2O3 additive promotes a¿ß transformation but not significant densification. A broad band emission center at 570 nm assigned to Eu2+ is observed, Eu3+ in Eu2O3 is (partially) converted to Eu2+ by reaction with Si3N4, which results in a lower ß aspect ratio and ß-content compared to the other Ln (Ln=lanthanide) oxide additives.
| Original language | English |
|---|---|
| Pages (from-to) | 2298-2304 |
| Journal | Journal of Luminescence |
| Volume | 130 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 2010 |
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