Electroluminescence in thick-film devices with ZnS:Mn prepared by microwave-assisted synthesis

Abstract

Electroluminescent devices are essential components in modern lighting and display technologies, offering uniform and efficient light emission. Research in this field has focused on optimizing luminescent materials such as manganese-doped zinc sulphide (ZnS:Mn), which is prized for its bright emission and environmental compatibility. However, current synthesis methods often struggle with long processing times, poor control over particle size, and phase instability, limiting the performance and scalability of these materials. Here we show that microwave-assisted solvothermal synthesis, followed by a sintering step, enables the production of high-quality ZnS:Mn particles suitable for fabricating efficient alternating current powder electroluminescent (ACPEL) panels. Using this approach, the ZnS:Mn particles predominantly form in a stable crystalline phase with a secondary phase emerging after sintering, as confirmed by X-ray diffraction. Photoluminescence measurements reveal a strong orange-yellow emission, indicating effective Mn²⁺ incorporation. ACPEL panels fabricated with these particles exhibit optimal performance with a thin electroluminescent film, achieving peak luminescence under moderate excitation conditions. These findings demonstrate that the refined synthesis method provides uniform particle morphology, enhanced luminescent properties, and reliable device performance. These results advance the field by offering a scalable and energy-efficient route to produce high-performance electroluminescent materials, paving the way for improved lighting and display applications. Immediate implications include the potential for more consistent manufacturing processes and enhanced device longevity in commercial ACPEL systems.