Optical and Photoconversion Properties of Ce³⁺ Doped (Ca,Y)3(Mg,Sc)2Si₃O₁₂ Films grown by LPE method onto YAG and YAG:Ce Substrates

This study investigates the structural, luminescent, and photoconversion properties of composite converters based on epitaxial structures containing single-crystalline films of Ce³⁺-doped Ca₂₋ₓY₁₊ₓMg₁₊ₓSc₁₋ₓSi₃O₁₂:Ce (x=0–0.25) (CYMSSG:Ce) garnet, and Y₃Al₅O₁₂ (YAG) or YAG:Ce substrates, grown using the Liquid Phase Epitaxial (LPE) method. The research focuses on a detailed analysis of the properties of film-crystal composite converters to achieve a deeper understanding of their photoconversion performance, providing an innovative approach to designing a new type of film/ substrate converters for white LEDs. This was accomplished by systematically varying the Y/Sc/Mg cation content in the film and adjusting the film thickness within the range of 19–67 µm for CYMSSG:Ce/YAG structures and 10–22 µm for CYMSSG:Ce/YAG:Ce structures. A significant emphasis of this research was placed on mapping the performance of these converters using a color coordinate diagram, a key tool for visualizing the relationship between film composition, thickness, and photoconversion efficiency. The resulting data revealed clear and distinct trends, offering valuable insights into the tunability of the luminescent properties of white LEDs through precise control of content and film thickness.