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Visible And Ultraviolet Upconversion And Near Infrared Downconversion Luminescence From Lanthanide Doped La2zr2o7 Nanoparticles, Santosh K. Gupta, Mitzy A. Penilla Garcia, Jose P. Zuniga, Maya Abdou, Yuanbing Mao
Visible And Ultraviolet Upconversion And Near Infrared Downconversion Luminescence From Lanthanide Doped La2zr2o7 Nanoparticles, Santosh K. Gupta, Mitzy A. Penilla Garcia, Jose P. Zuniga, Maya Abdou, Yuanbing Mao
Chemistry Faculty Publications and Presentations
Single materials which have a multitude of photophysical processes by selective doping are in high demand in the community of material science due to their multifunctional applications. Upconversion (UC) and downconversion (DC) luminescence properties of lanthanide doped nanoparticles (NPs) are imperative for their broad application potentials. Here, we describe two series of either doubly or triply doped La2Zr2O7 NPs synthesized by a molten salt method. For the former, La2Zr2O7:Yb,Er NPs display bright red and moderate green UC (VUC) and NIR-B DC (NDC) at around 1550 nm, which are highly desirable for in-vivo bioimaging applications. For the latter, La2Zr2O7:Gd,Yb,Tm NPs demonstrate …
Roles Of Oxygen Vacancies And Ph Induced Size Changes On Photo- And Radioluminescence Of Undoped And Eu3+-Doped La2zr2o7 Nanoparticles, Santosh K. Gupta, Maya Abdou, Jose P. Zuniga, Partha Sarathi Ghosh, Enrique Molina, Ben Xu, Mircea Chipara, Yuanbing Mao
Roles Of Oxygen Vacancies And Ph Induced Size Changes On Photo- And Radioluminescence Of Undoped And Eu3+-Doped La2zr2o7 Nanoparticles, Santosh K. Gupta, Maya Abdou, Jose P. Zuniga, Partha Sarathi Ghosh, Enrique Molina, Ben Xu, Mircea Chipara, Yuanbing Mao
Chemistry Faculty Publications and Presentations
Defect, doping and particle size play important roles on the optical performance of nanophosphors. In this study, undoped La2Zr2O7 NPs (LZO) displayed multicolor emission under UV irradiation due to the presence of ionized oxygen vacancies in the band gap. In addition, we explored the effect of particle size of La2Zr2O7:Eu3+ (LZOE) NPs on their structure, surface area, photoluminescence, radioluminescence, lifetime and quantum yield. There is progressive decrease in luminescence output and quantum yield as the coprecipitation pH is raised to prepare the single-source precursors for the molten salt synthesis of the NPs. Under X-ray irradiation, the LZOE …