Answers are grounded in this paper and cite their sources.
Complex oxide YVO4 multi-shell hollow spheres with uniform morphologies and controllable shell numbers are successfully prepared by using a newly developed and general composite yttrium-carbonaceous sphere templated approach. The prominent upconversion luminous intensity of the YVO4:Yb3+/Er3+ hollow spheres might be attributed to the enhanced near-infrared excitation light harvesting efficiency originated from the multiple reflections.
No takes yet. Share an insight, caveat, or question.
Zong et al. (2016) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: