Abstract
We investigated the luminescent properties of Ho 3+ and Yb 3+ co-doped A ZrO 3 ( A = Ca, Sr, and Ba) perovskite nanocrystals synthesized using a combustion method. X-ray diffraction measurement revealed that these nanocrystals exhibited differences in their structural symmetries, varying from orthorhombic in CaZrO 3 to cubic in BaZrO 3 , with an increase in their grain sizes and an enhanced degree of crystallinity along increased post-annealing temperatures. Under near-infrared excitations, we observed strong green (545 nm) and weak red (660 nm) emissions from the Ho 3+ ions. Interestingly, the smaller the sizes of the A ions, the stronger were the upconversion emissions and the greater was the increase in the emission intensity due to post-annealing. We found that the crystal symmetry and the degree of crystallinity of the host play an important role in determining the luminescent behavior of Ho 3+ ions in perovskite nanocrystals.
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