Modulation of up-conversion luminescence properties by poling and Er3+ doping of KNN-based ceramics

Perovskite oxides with luminescent ions hold great promise in optoelectronic devices because of their outstanding thermal stability and electro-optic performance. In this work, 0.95K[Formula: see text]Na[Formula: see text]Nb[Formula: see text]Sb[Formula: see text]O 3 -0.05Bi[Formula: see text]Na[Formula: see text]ZrO[Formula: see text] mol Er[Formula: see text] (KNNS-BNZ-xEr) ceramics were synthesized using the traditional solid-state method. Effects of Er[Formula: see text] content on the phase structure, microstructure and photoluminescent properties of the ceramics were investigated. The introduction of rare-earth Er[Formula: see text] improved the lattice symmetry, refined the grain size and endowed the ceramics with photoluminescent properties. The ceramics show bright green emission and red emission under 980[Formula: see text]nm stimulation at room temperature. The maximum luminescence intensity was reached at [Formula: see text]. Additionally, luminescence emission intensity can be easily modulated by poling. It is found that the KNNS-BNZ-0.01Er ceramics with the optimal UC emission features show the highest luminescence intensity contrast ([Formula: see text]) value of 3.02 after poling. It was found that the poling modulation of luminescence was closely related to cell distortion and band structure. These findings provide valuable insights for the development of KNN-based ceramics in optical applications such as luminescence switching.