Abstract
Y2O3 ceramics containing up to 4 at.%Zn2+ were prepared by infiltrating a zinc acetate water solution into a pre-sintered matrix of Y2O3. After pressureless sintering for 2 h at 1400 °C, ZnO grains dispersed in an Y2O3 matrix were identified. The photoluminescence (PL) spectra of the Y2O3:ZnO ceramics exhibit a very broad emission band over the entire visible spectral range with an intensity maximum at about 570−590 nm. The intensity of the PL emission increases with an increasing concentration of additive Zn2+, reaching a maximum between 3 and 4 at.%. The annealing temperature also affects the emission intensity. The Y2O3-ZnO ceramic emits yellowish (warm) white light with the CIE 1931 colour coordinates (0.39,0.43) and a correlated colour temperature in the range of 4000−4600 K. The luminescence decay kinetics at RT exhibit multi-exponential behaviour with faster (∼180 ns) and slower (1.3μs and 8.0μs) decay components and the average lifetime spanning into the range of 5.3–6.5μs.
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