Design and synthesis of Lanthanide based metal organic framework is a frontier area of research owing to their structural diversity enabling specific applications. The luminescence properties of rare earths, tuned by the structural features of Ln-MOFs are investigated extensively. Rare earth oxalates which can be synthesized in a facile method, ensuring the structural features of MOFs with excellent photoluminescence characteristics deserves much attention. This work is the first time report on the single crystal structure and Judd-Ofelt (JO) theoretical analysis – their correlation with the intense and sharp green luminescence of Terbium oxalate crystals. The intense green luminescence observed for Terbium oxalate crystals for a wide range of excitation from DUV to visible region despite the luminescence limiting factors are discussed. The absence of concentration quenching and lifting up of forbidden nature of f-f transitions, allowing direct excitation of Terbium ions is analysed with the help of JO theory and single crystal structure analysis. The JO analysis predicted the asymmetry of Terbium sites, allowing the electric dipole transitions and from the JO intensity parameters, promising spectroscopic parameters – emission cross section, branching ratio, gain band width and gain coefficient of the material were calculated. The single crystal structure analysis revealed the asymmetry of Tb sites and structure of Terbium oxalate is formed by the hydrogen bonded stacking of overlapped six Terbium membered rings connected by the oxalate ligands. The molecularly thick layers thus formed on the crystal surface are imaged by the atomic force microscopy. The presence of water channels in the structure and the effect of lattice water molecules on the luminescence intensity are also investigated.

基于镧系元素的金属有机骨架的设计和合成是研究的前沿领域，因为它们的结构多样性使特定的应用成为可能。通过Ln-MOFs的结构特征对稀土的发光性质进行了广泛的研究。可以以简便的方法合成的草酸稀土，确保具有优异的光致发光特性的MOF的结构特征值得关注。这项工作是有关单晶结构和Judd-Ofelt（JO）理论分析的首次报告-它们与草酸Ter晶体的强烈而尖锐的绿色发光相关。讨论了草酸Ter晶体在从DUV到可见光区域的大范围激发中观察到的强烈绿色发光，尽管有发光限制因素。借助JO理论和单晶结构分析，分析了不存在浓度猝灭和ff跃迁禁忌性质的升高，允许直接激发of离子。JO分析预测了sites位点的不对称性，允许电偶极跃迁，并根据JO强度参数，计算了有希望的光谱参数-发射截面，支化比，增益带宽和材料的增益系数。单晶结构分析揭示了Tb位点的不对称性，草酸Ter的结构是通过由草酸配体连接的重叠的六个Ter成员环的氢键堆叠形成的。如此形成在晶体表面上的分子厚的层通过原子力显微镜成像。