Abstract: Silica encapsulation was studied on the particle surface of aluminate-based luminescent pigment by using TEOS as
the raw materials. The encapsulated particles were analyzed by SEM, diameter testing, BET surface area measurement and XPS, a dense SiO₂ film formed
on particle surface with the thickness of 14nm. The anti-water property and luminescent characteristics measurement show
that encapsulated particles have a better anti-water performance and similar luminescent properties to non-encapsulated particles. Moreover, the
encapsulation procedure was analyzed and the process parameters’ effect on coating film was also researched. The results show that the encapsulation
procedure is actually a kind of sol-gel procedure of SiO₂·nH₂O on the surface of particles and its process is optimized as following: pH
of encapsulation solvent is about 10, encapsulation temperature is at 80℃ and reaction time is about 3.0.

Key words: luminescent pigment, encapsulation, sol-gel, aluminate