Against the backdrop of increasing miniaturization and integration of electronic components, the demand for materials with multifunctionality has increased significantly. Among these, transparent fluorescent ferroelectric ceramics exhibiting ferroelectricity, optical transparency, and photoluminescence (PL) have garnered significant attention. However, an interdependent relationship exists in a ferroelectric material among polarization, transparency, and photoluminescence, which presents a challenge for optimizing the coupling of optoelectronic properties. In this work, the doping concentration of Er³⁺ in 0.825(K_0.5Na_0.5)NbO₃-0.175Sr(Sc_0.5Nb_0.5)O₃: x%Er (x = 0–0.15) system was modulated by first-principle calculations through compositional design and performance-influencing-factor-analysis strategies. The experimental results showed that grain size of the ceramic was reduced to 28 μm at x = 0.05, concentration of vacancy defects in the lattice was low, and band gap value was increased to 3.105 eV. The multifunctional ceramic, while maintaining an excellent recoverable energy storage density (W_rec = 2.03 J/cm³) and energy storage efficiency (η = 75.67%), demonstrated a 56% (1100 nm) good near-infrared transmittance and upconversion photoluminescence properties at 527, 549 nm, and 667 nm exhibiting weak green, strong green, and weak red light, respectively. This study provides a theoretical foundation and new approach for realizing the multifunctionality of photoelectric couple by introducing rare earth elements as luminescent centers into ferroelectric ceramics.

中文翻译：

---

Er 改性 KNN 基透明铁电陶瓷的多功能储能和光致发光


在电子元件日益小型化和集成的背景下，对多功能材料的需求显着增加。其中，具有铁电性、光学透明度和光致发光 （PL） 的透明荧光铁电陶瓷引起了广泛关注。然而，铁电材料中存在极化、透明度和光致发光之间的相互依存关系，这为优化光电特性的耦合提出了挑战。在本研究中，通过成分设计和性能影响因素分析策略，通过第一性原理计算对 0.825（K _0.5 Na _0.5 ）NbO ₃ -0.175Sr（Sc _0.5 Nb _0.5 ）O ₃ ： x%Er （x = 0–0.15） 体系中 Er ³⁺ 的掺杂浓度进行调制。实验结果表明，在x = 0.05时，陶瓷的晶粒尺寸减小到28 μm，晶格中空位缺陷的浓度较低，带隙值增加到3.105 eV。多功能陶瓷在保持优异的可恢复储能密度 （W _rec = 2.03 J/cm ³ ） 和储能效率 （η = 75.67%） 的同时，在 527、549 nm 和 667 nm 处表现出 56% （1100 nm） 的良好近红外透射率和上转换光致发光性能，分别表现出弱绿光、强绿光和弱红光。本研究通过将稀土元素作为发光中心引入铁电陶瓷中，为实现光电耦合的多功能性提供了理论基础和新途径。