Direct Writing of Fluorescent Patterns of Rare-Earth-Doped Nanophosphors by Microplasma Jet

Direct writing of rare-earth (RE)-doped nanophosphor patterns was realized using an atmospheric pressure microplasma jet via plasma dissociation of acetylacetonate compounds. Rapid and localized deposition of crystalline Y₂O₃-based particles on substrates was achieved through digitally controlled electrode movement, thus forming arbitrary fluorescent patterns in desired positions. Characteristic and intense emissions of Tb³⁺ and Eu³⁺ were detected, referring the effective doping of Tb³⁺ and Eu³⁺ in Y₂O₃. This study provides a simple, flexible, and efficient approach for the construction of fluorescent patterns on materials.