ZnAl₂O₄:Cr³⁺ hollow spheres composed of secondary nanoparticles with single spinel phase were fabricated using carbon templets. Monitoring the emission of 687 nm, two wide excitation bands attributed to the electrons of Cr³⁺ transiting from ⁴A_2g (⁴F) → ⁴T_1g (⁴F) and ⁴A_2g (⁴F) → ⁴T_2g (⁴F) were observed. The broad excitation band at about 397 nm was asymmetric and consisted of two peaks, indicating that there was a trigonal distortion existing in the lattices. The intensity of all emitting peaks revealed sharp increasing trend with the sintering temperature increase, and the intensity of emission at 698 nm assigned to inversion defects was more intense than that of emission at 687 nm assigned to octahedral Cr³⁺ ions in the undistorted spinel lattice. The samples with higher synthesized temperature revealed longer decay time, and the relative weightage of shorter decay time component decreased with the increase of sintering temperature, indicating that the surface defects decreased.

使用碳模板制备了具有单尖晶石相的次级纳米颗粒组成的ZnAl ₂ O ₄：Cr ³⁺空心球。监测687 nm的发射，归因于Cr ³⁺电子从⁴ A _2g（⁴ F）→ ⁴ T _1g（⁴ F）和⁴ A _2g（⁴ F）→ ⁴ T _2g（⁴F）被观察到。在约397 nm处的宽激发带是不对称的，由两个峰组成，表明晶格中存在三角畸变。随着烧结温度的升高，所有发射峰的强度都呈现出急剧增加的趋势，在未变形的尖晶石晶格中，分配给反转缺陷的698 nm处的发射强度比分配给八面体Cr ³⁺离子的687 nm处的发射强度更强。。合成温度较高的样品，其衰变时间较长，而随着烧结温度的升高，较短的衰变时间组分的相对重量减小，表明表面缺陷减少。