Optically-active thin films are employed in a variety of applications, such as LEDs and photovoltaics, due to their ability to act as up- or down-photon energy converters. Their performance depends critically on their composition and structure; thus, the use of novel synthesis techniques that allow for their control at the nanoscale level can result in improved efficiency and practicality. Layered thin films consisting of Eu²⁺- doped BaF₂ nanocrystalline layers separated by amorphous Al₂O₃ were synthesized via sequential pulsed laser deposition using three separate targets for the different components; this synthesis technique provides precise control of layer thickness at the nanoscale along with dopant distribution within the film. Cross-sectional transmission electron microscopy analysis verified the desired nano-layering. Post-deposition heat treatments in a nitrogen atmosphere resulted in samples exhibiting steady emission with a broad peak ranging from 400 to 600 nm and a shoulder at 410 nm. The CIE 1931 chromaticity coordinates are x = 0.26–0.29 and y = 0.32–0.35 and vary as a function of the sample configuration. Because the chromaticity coordinates are close to those of a pure white light (x = 0.33,y = 0.33), these films demonstrate advantageous properties for applications with UV-pumped white light LEDs.

光学活性薄膜可用于各种应用，例如 LED 和光伏，因为它们能够充当向上或向下光子能量转换器。它们的性能主要取决于它们的组成和结构；因此，使用允许在纳米级进行控制的新型合成技术可以提高效率和实用性。由 Eu ²⁺ - 掺杂的 BaF ₂纳米晶层组成的层状薄膜被非晶 Al ₂ O ₃隔开通过连续脉冲激光沉积对不同成分使用三个单独的目标合成；这种合成技术可以精确控制纳米级的层厚度以及薄膜内的掺杂剂分布。横截面透射电子显微镜分析证实了所需的纳米分层。在氮气氛中的沉积后热处理导致样品表现出稳定的发射，其宽峰范围为 400 至 600 nm，肩峰位于 410 nm。CIE 1931 色度坐标为 x = 0.26–0.29 和 y = 0.32–0.35，并随样本配置而变化。由于色度坐标接近纯白光的色度坐标 (x = 0.33,y = 0.33)，因此这些薄膜显示出适用于紫外线泵浦白光 LED 应用的有利特性。