Abstract
In the emission spectra of nanocrystalline Y2O3:Eu with decreasing the particle size, the 5D0–7F0 transition of Eu3+ shifts towards blue. This size effect is explained by lattice expansion of the nanocrystallines, more precisely, by larger Eu–O distance. Meanwhile, increasing temperature also expands the lattice constant and shifts the emission peak to blue. Then nephelauxetic effect is employed to organize the size effect and temperature dependence. It is also introduced to indicate the change of Eu3+ coordination number in the nanosized phosphor. Based on the experimental results, possible applications of temperature sensing and stress mapping with Eu3+ doped nanocrystalline phosphors are proposed.
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