Lead-free non-rare earth oxide phosphors have attracted wide attention due to their environmental protection, sustainability, and potential to replace halides and fluorides in the field of plant lighting. Among them, the Cr-excited aluminate phosphor exhibits high brightness, high thermal stability, and far red to near-infrared (NIR) emission due to the influence of the crystal field strength (CFS). This property gives rise to a variety of strategies used to modulate the CFS, for example, single ion substitution, chemical unit co-substitution, etc. Here, we chose the substitution of a single ion, with [BaO6] gradually replacing [SrO6] to form a solid solution. Their structural characteristics and the local structure of Cr are studied and discussed. The device is packaged to evaluate the feasibility of the material for practical application. The prepared phosphor had a bright far-red light emission of 693 nm under blue light excitation, and this spectrum strongly matched the absorption of plant phytochrome P. This work provides the design principle of far red light emission activated by Cr aluminate solid solution, which can inspire further research on pc-LED lights for plant lighting.

中文翻译：

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固溶体结构工程增强农业照明用SrMgAl10O17:Cr3+的发光

无铅非稀土氧化物荧光粉因其环保性、可持续性以及在植物照明领域替代卤化物和氟化物的潜力而受到广泛关注。其中，Cr激发的铝酸盐荧光粉由于晶体场强度（CFS）的影响而表现出高亮度、高热稳定性以及远红至近红外（NIR）发射。这一特性催生了多种用于调节CFS的策略，例如单离子取代、化学单元共取代等。这里，我们选择单离子取代，[BaO6]逐渐取代[SrO6]以形成固溶体。对它们的结构特征和Cr的局部结构进行了研究和讨论。对器件进行封装以评估材料实际应用的可行性。所制备的荧光粉在蓝光激发下具有693 nm的明亮远红光发射，该光谱与植物光敏色素P的吸收强烈匹配。该工作提供了铝酸铬固溶体激活远红光发射的设计原理，可以激发对用于植物照明的 PC-LED 灯的进一步研究。