Abstract
Highly porous Y2O3:Ho,Yb ceramic with relative high compressive strength was successfully fabricated by using NaF as pore-forming agent for the first time. The porosity, pore size, compressive strength and temperature-dependent upconversion luminescence of the as-fabricated porous Y2O3:Ho,Yb ceramic were investigated in detail. It was found that the open porosity and compressive strength of the as-fabricated porous Y2O3:Ho,Yb ceramic were 43.12% and 28.53 MPa, respectively, and the pore size was 4–8 μm. Under 980 nm excitation, the upconversion luminescence intensity ratio (I550/I665) of the 550 nm and 665 nm emissions varied from 8.10 to 4.63 with the temperature increasing from 293 K to 873 K. Porous Y2O3:Ho,Yb ceramic with such properties could be applied to ultra-high temperature ceramic structures for space application, luminescent probes and temperature sensors.
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