Abstract A new red phosphor, Bi3+ co-doped CeO2:Eu3+, was synthesized by a hydrothermal co-precipitation method. XRD, TEM, Raman, XPS, luminescence spectra, energy transfer mechanism, and the decay time of Bi3+ co-doped CeO2:Eu3+ phosphor were systematically investigated in detail. Influence of Bi3+ substitutions on Eu3+ surroundings and associated luminescence performance was researched. It is found that co-doping of Bi3+ promoted the increase of oxygen vacancies in the lattice. In addition, Bi3+-doped CeO2 deviates the known strongly dependency of oxygen vacancies defect association energy, and Bi3+ tend to interact with oxygen vacancies at the nearest-neighbor position to inhibit the defect formation of Ce3+ oxidation states. Therefore, the presence of Bi3+ effectively enhance the emission intensity of Eu3+ under the excitation at 365 nm, even when oxygen vacancies in the lattice are increased. The results indicate that, Bi3+ co-doping effectively increases oxygen vacancies and enhances the luminescence intensity of CeO2:Eu3+, which promotes its potential applications in biology and medicine.

中文翻译：

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Bi3+ Co掺杂CeO2:Eu3+荧光粉可见光发射的缺陷和对称性影响

摘要 采用水热共沉淀法合成了一种新型红色荧光粉Bi3+共掺杂CeO2:Eu3+。系统详细地研究了Bi3+共掺杂CeO2:Eu3+荧光粉的XRD、TEM、拉曼、XPS、发光光谱、能量转移机制和衰减时间。研究了Bi3+取代对Eu3+周围环境和相关发光性能的影响。发现Bi3+的共掺杂促进了晶格中氧空位的增加。此外，Bi3+掺杂的CeO2偏离了已知的氧空位缺陷结合能的强烈依赖性，并且Bi3+倾向于与最近邻位置的氧空位相互作用以抑制Ce3+氧化态的缺陷形成。因此，Bi3+的存在有效增强了Eu3+在365nm激发下的发射强度，即使晶格中的氧空位增加。结果表明，Bi3+共掺杂有效地增加了氧空位并增强了CeO2:Eu3+的发光强度，从而促进了其在生物学和医学中的潜在应用。