在“绿色”植物栽培中，人工光源的强度和光谱质量显著影响植物的形态建成与生理响应。基于荧光粉的光转换薄膜能够将紫外辐射精确转换为光合有效辐射（即红光），为下一代生态农业带来了巨大潜力。然而，传统红色荧光粉往往稳定性较差，或者发射波长较短的红光，更适合显示应用而非植物生长，从而限制了其在农业中的应用。 本文合成了一种耐候性优良的Mn4+掺杂钇铝石榴石（YAG:Mn4+） 深红光荧光粉，其发射峰位于672 nm处。通过引入Mg2+ 作为电荷补偿剂对荧光粉的发光性能进行了优化，显著提高了其发射强度。通过系统的光谱分析，详细研究了其光致发光特性和热猝灭行为。采用可生物降解的聚乙烯醇与所制备的荧光粉制成光转换薄膜，用于促进豌豆幼苗的生长。作为概念验证，在自然光照并辅以额外紫外灯的条件下进行的初步研究表明，所制备的光转换薄膜处理能够促进豌豆幼苗的生长。这一改善可归因于该薄膜将不利于植物生长的紫外辐射有效转化为有益的红光。上述结果证明了基于YAG:Mn4+–Mg2+的荧光粉薄膜在提高农业生产力及推广生态友好型栽培实践方面的潜力。

The intensity and quality of the artificial light used in ‘‘green” plant cultivation greatly affect plant morphogenesis and physiological responses. Light-conversion films based on phosphors that can enable the precise conversion of ultraviolet (UV) radiation into photosynthetically active radiation (i.e., red light) hold great promise for next-generation ecological agriculture. However, conventional red phosphors often suffer from low stability or emit a short-wavelength red light more suitable for display than plant growth, limiting their agricultural applications. Herein, a weather-resistant Mn⁴⁺-doped yttrium aluminum garnet (YAG:Mn⁴⁺) deep red phosphor with a strong emission peak at 672 nm was synthesized. The phosphor’s luminescent properties were optimized by introducing Mg²⁺ as a charge compensator, thereby significantly increasing the phosphor’s emission intensity. Detailed photoluminescence and thermal quenching behaviors were investigated through comprehensive spectroscopic analyses. Light-conversion film made of biodegradable polyvinyl alcohol and the prepared phosphors was utilized to intensify the process of cultivating pea seedlings. As a proof of concept, a preliminary study under sunlight with an additional UV lamp demonstrated that treatment with the prepared light-conversion film enhanced the growth of pea seedlings. These improvements can be attributed to the effective conversion of UV radiation, which is useless for plant growth, into beneficial red light. The results demonstrate the potential of YAG:Mn⁴⁺–Mg²⁺-based phosphor films to improve agricultural productivity and promote eco-friendly cultivation practices.