Composite Yttrium‐Carbonaceous Spheres Templated Multi‐Shell YVO₄ Hollow Spheres with Superior Upconversion Photoluminescence

Abstract

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.