Ba5Zn4Gd8O21:Tb3+ nanorods; synthesized via solution combustion route; were found to crystallize in the tetragonal (I4/m, 87) crystal system. The UV excitation at 290 nm of all Ba5Zn4Gd8O21:Tb3+ samples yielded the characteristics emission corresponding to 5D4 → 7F6,5,4,3 transitions in Tb3+ activator (used for Judd-Ofelt analysis). A detailed investigation of photoluminescence decay curves and emission spectra of Ba5Zn4Gd8O21:Tb3+ nanorods provided the radiative lifetime (1.0889 ms) and total radiative transition rates from 5D4 state in Tb3+ ion. The electric-dipole radiative transition probabilities (extracted from total radiative rates i.e. electric-dipole + magnetic-dipole) were used to calculate the Judd-Ofelt intensity parameters (Ω2 = 4.76 × 10-20, Ω4 = 2.11 × 10-20 and Ω6 = 2.00 × 10-20 cm2). The very high quantum efficiency of 5D4 state (81%) suggests their potential use in lighting and display devices. Finally, a large magnitude of peak stimulated emission cross section of 5D4 → 7F5 (16.5838 × 10-20 cm2) transition also claims their promising candidature as a good laser material.

中文翻译：

---

通过发射光谱对Ba5Zn4Gd8O21：Tb3 +进行结构表征和Judd-Ofelt参数化。

Ba5Zn4Gd8O21：Tb3 +纳米棒; 通过溶液燃烧路线合成；被发现在四方（I4 / m，87）晶体系统中结晶。所有Ba5Zn4Gd8O21：Tb3 +样品在290 nm处的紫外线激发产生了与Tb3 +活化剂中的5D4→7F6、5、4、3跃迁相对应的特征发射（用于Judd-Ofelt分析）。详细研究了Ba5Zn4Gd8O21：Tb3 +纳米棒的光致发光衰减曲线和发射光谱，提供了Tb3 +离子的辐射寿命（1.0889 ms）和5D4态的总辐射跃迁速率。电偶极子的辐射跃迁概率（从总辐射率中减去，即电偶极子+磁偶极子）用于计算Judd-Ofelt强度参数（Ω2= 4.76×10-20，Ω4= 2.11×10-20和Ω6 = 2.00×10-20 cm2）。5D4态的极高量子效率（81％）表明它们在照明和显示设备中的潜在用途。最后，从5D4→7F5（16.5838×10-20 cm2）跃迁的峰值激发发射横截面的大幅度变化也证明了它们作为良好的激光材料的良好前景。