Alternating current electroluminescence (ACEL) shows great potential in lighting, display and intelligent skin. Herein, the ACEL properties of Pr³⁺-doped Ba_0·85Ca_0·15Ti_0·90Zr_0·10O₃ ceramic and its PDMS-based composite have been investigated. Intense red EL emission was obtained in the ceramic sample whereas blue EL emission of Pr³⁺ was observed for the first time in the composite counterpart. The red EL emission should be attributed to the impact of hot electrons driven by the large piezoelectric electric field. Owing to the cross-relaxations through the 4f5d levels and Pr-to-metal charge transfer state, the ³P_J emissions were completely quenched, and thus leading to an enhancement in red emission. However, external E field induced a large local piezoelectric deformation of the ceramic particles embedded in the PDMS matrix, which in turn caused a bending of CB and then a downwards shift of the 4f5d levels from the CB. Hence the cross-relaxations were hindered, and the blue EL emission was observed in the composites. The results would attract attention of functional materials studies and expand our understanding of such facile structure and oxide EL devices to facilitate their use in integral part of flexible device systems.

交流电致发光（ACEL）在照明，显示和智能皮肤中显示出巨大的潜力。在此，研究了掺Pr ^3+的Ba _0·85 Ca _0·15 Ti _0·90 Zr _0·10 O ₃陶瓷及其PDMS基复合材料的ACEL性能。在陶瓷样品中获得了强烈的红色EL发射，而在复合材料中首次观察到Pr ^3+的蓝色EL发射。红色EL发射应归因于大压电电场驱动的热电子的影响。由于穿过4f5d能级和Pr-金属电荷转移状态的交叉弛豫，因此³ P _J发射完全熄灭，从而导致红色发射增加。但是，外部电场会导致嵌入PDMS基质中的陶瓷颗粒发生较大的局部压电变形，进而引起CB弯曲，然后导致4f5d含量从CB向下移动。因此，交叉松弛受到阻碍，并且在复合材料中观察到蓝色EL发射。该结果将引起功能材料研究的注意，并扩大我们对这种易用结构和氧化物EL器件的理解，以促进它们在柔性器件系统的组成部分中的使用。