The long persistence luminescent property of Cr-doped ZnG₂O₄ phosphor in the deep red/near-infrared region has been of great interest for the purpose of in vivo bioimaging application. Improving the optical property and afterglow lifetime of this material remain challenging. The microcrystalline cellulose assisted liquid phase precursor process was developed for the synthesis of high-quality ZnGa₂O₄ phosphors, which process enables uniform distribution of the dopant and co-dopant. In this paper, the co-doping of Bi enhanced the photoluminescence intensity by about 2.5 times, while significantly improving the long afterglow property. Investigation of the influence of the Bi addition indicated that the co-doping Bi not only serves to purify Cr ions in ZnGa₂O₄, but also brings about the growth of particles and changes in morphology through the role of flux.

出于体内生物成像应用的目的，在深红色/近红外区域中Cr掺杂的ZnG ₂ O ₄磷光体的长余辉发光特性引起了人们的极大兴趣。改善这种材料的光学性能和余辉寿命仍然具有挑战性。开发了微晶纤维素辅助液相前驱体工艺，用于合成高质量的ZnGa ₂ O ₄磷光体，该过程可以使掺杂剂和共掺杂剂均匀分布。在本文中，Bi的共掺杂将光致发光强度提高了约2.5倍，同时显着改善了长余辉性能。Bi的添加影响的研究表明，共掺杂Bi不仅用于纯化ZnGa ₂ O _4中的Cr离子，而且还通过助熔剂的作用引起颗粒的生长和形态的变化。