近日，太原理工大学的王磊&乔建伟及其研究团队取得一项新进展。他们通过组分工程设计实现了，用于先进植物照明系统的相稳定且高效的深红色荧光粉。相关研究成果已于2024年12月11日在国际知名学术期刊《光：科学与应用》上发表。

据悉，无机发光材料在光电器件应用中展现出巨大潜力。然而，氧化物基深红色荧光粉的发光效率有限且热稳定性较差，这阻碍了植物照明技术的进步。

本文提出了一种简单的组分工程策略，以稳定物相、提高外量子效率（EQE）并增强热稳定性。通过在NaMgPO₄:Eu中掺入SiO₄对PO₄四面体进行化学修饰，降低了形成能，从而生成了纯橄榄石相，并将外量子效率从27%提高到52%，创下了氧化物深红色荧光粉的记录。

同时，引入的深缺陷能级将150°C下的热稳定性从62.5%提高到85.4%。此外，激发峰和发射峰分别移至440nm和675nm，与植物光敏色素的特定光谱吸收需求精确匹配。而且，在80%相对湿度和80°C条件下暴露6小时后，发光强度几乎无衰减。

采用Na_1.06MgP_0.94Si_0.06O₄:Eu的pc-LED在300mA下实现了780mW的高输出功率。本研究展示了一种优化无机发光材料性能的简便方法，并为低成本植物照明提供了替代解决方案。

附：英文原文

Title: Compositional engineering of phase-stable and highly efficient deep-red emitting phosphor for advanced plant lighting systems

Author: Qiao, Jianwei, Li, Dehong, Shi, Qiufeng, Guo, Haijie, Huang, Ping, Wang, Lei

Issue&Volume: 2024-12-11

Abstract: Inorganic luminescent materials hold great promise for optoelectronic device applications, yet the limited efficiency and poor thermal stability of oxide-based deep-red emitting phosphors hinder the advancement of plant lighting technologies. Herein, a simple compositional engineering strategy is proposed to stabilize the phase, boost external quantum efficiency (EQE) and enhance thermal stability. The chemical modification of the PO₄ tetrahedron in NaMgPO₄:Eu by incorporating SiO₄ lowers the formation energy, leading to the generation of pure olivine phase and increasing the EQE from 27% to 52%, setting a record for oxide deep-red phosphors. In parallel, the introduced deep defect level improves thermal stability at 150°C from 62.5% to 85.4%. Besides, the excitation and emission peaks shifted to 440nm and 675nm, respectively, aligning precisely with the specific spectral absorption requirements of plant phytochromes. Moreover, the luminescent intensity showed nearly no decay after being exposed to 80% relative humidity and 80^oC for 6h, and the pc-LED utilizing Na_1.06MgP_0.94Si_0.06O₄:Eu achieves a high output power of 780mW at 300mA. Our research demonstrates a facile method for optimizing the performance of inorganic luminescent materials and provides alternative solutions for low-cost plant lighting.

DOI: 10.1038/s41377-024-01679-9

Source: https://www.nature.com/articles/s41377-024-01679-9