Hikita Wataru, Iwaki Masato, Watanabe Mizuki, Uematsu Kazuyoshi, Sato Mineo, Toda Kenji
Graduate School of Science and Technology, Niigata University 8050 Ikarashi 2-no-cho Niigata 950-2181 Japan
Department of Chemistry and Chemical Engineering, Faculty of Engineering, Niigata University Ikarashi 2-no-cho Niigata City 950-2181 Japan.
RSC Adv. 2025 Mar 4;15(9):7039-7049. doi: 10.1039/d5ra00377f. eCollection 2025 Feb 26.
Mn-activated phosphors have been attracted to replace the rare-earth-activated phosphors in the use of deep-red optical devices. Owing to their low toxicity and wide applications, oxide materials are promising hosts for Mn phosphors. Exploration into novel oxides is important for developing new Mn-doped phosphors with high luminescent efficiencies. In this study, we discovered the deep-red emitting phosphor SrCaGaO:Mn in the SrGaO-CaGaO solid solution system. From the single crystal X-ray diffraction analysis, SrCaGaO:Mn was found to crystallize in a cubic unit cell with space group 432. Furthermore, SrCaGaO:Mn was revealed to be a new member of tululite structure-related phosphors, such as CaZnAlO:Mn, CaZnGaO:Mn, and CaMgGaO:Mn. To study the fundamental luminescence properties, we synthesized SrCaGaO:Mn powder samples the conventional solid-state reaction method. SrCaGaO:Mn has an absorption band in the region of 250-550 nm, and shows a deep-red emission band peaks at 712 nm. The excitation band is well matched to the emission wavelength of near-ultraviolet and blue light emitting diodes. The optimized sample exhibited high quantum efficiency and good thermal quenching properties. This study revealed SrCaGaO:Mn has excellent potential as a deep-red emitting phosphor and is expected to be used for commercial applications, such as indoor plant cultivation and wavelength down-convertor for solar-cells.
锰激活的磷光体已被吸引用于取代深红色光学器件中使用的稀土激活磷光体。由于其低毒性和广泛的应用，氧化物材料是锰磷光体有前景的基质。探索新型氧化物对于开发具有高发光效率的新型锰掺杂磷光体很重要。在本研究中，我们在SrGaO-CaGaO固溶体体系中发现了深红色发光磷光体SrCaGaO:Mn。通过单晶X射线衍射分析，发现SrCaGaO:Mn以空间群为432的立方晶胞结晶。此外，SrCaGaO:Mn被揭示为与tululite结构相关的磷光体的新成员，如CaZnAlO:Mn、CaZnGaO:Mn和CaMgGaO:Mn。为了研究其基本发光特性，我们采用传统的固态反应方法合成了SrCaGaO:Mn粉末样品。SrCaGaO:Mn在250-550nm区域有一个吸收带，并在712nm处显示出一个深红色发射带峰。该激发带与近紫外和蓝光发光二极管的发射波长良好匹配。优化后的样品表现出高量子效率和良好的热猝灭性能。本研究表明SrCaGaO:Mn作为深红色发光磷光体具有优异的潜力，有望用于商业应用，如室内植物栽培和太阳能电池的波长下转换器件。
