Synthesis of Blue‐Emitting CaMgSi 2 O 6 :Eu 2+ Phosphor Using an Electrostatic Self‐Assembly Deposition Method

Eu 2+ ‐doped CaMgSi 2 O 6 phosphor was prepared by depositing mixed hydroxides of Ca, Mg, and Eu over spherical SiO 2 particles (300 nm) pre‐coated with polycations (polyethyleneimine), followed by calcination at 1200°C in a reducing atmosphere. The prepared phosphor showed intense blue emission, ascribable to the 4f 7 ‐4f 6 5d transition of Eu 2+ . In contrast, the luminescence intensity of the phosphor was considerably decreased when prepared without polycations. It was suggested that negatively charged hydroxides are deposited on positively charged SiO 2 surfaces pre‐coated with polycations through electrostatic self‐assembly interaction. On calcination, the hydroxide shells react with the SiO 2 cores to produce Eu 2+ :CaMgSi 2 O 6 .