The ability to tune and enhance the properties of luminescent materials is essential for enlarging their application potential. Recently, the modulation of the photoluminescence emission of lanthanide-doped ferroelectric perovskites by applying an electric field has been reported. Herein, we show that the ferroelectric order and, more generally the polar order, has a direct effect on the photoluminescence of Eu in the model BaZrTiO perovskite even in the absence of an external field. The dipole arrangement evolves with increasing x from long-range ferroelectric order to short-range order typical of relaxors until the non-polar paraelectric BaZrO is achieved. The cooperative polar interactions existing in the lattice (x < 1) promote the off-center displacement of the Eu ion determining a change of the lanthanide site symmetry and, consequently, an abrupt variation of the photoluminescence emission with temperature. Each type of polar order is characterized by a distinct photoluminescence behaviour.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6478923 | PMC |
| http://dx.doi.org/10.1038/s41598-019-42897-1 | DOI Listing |
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