Effect of SiO2 shell on photoluminescence enhancement of Eu3+ doped nanophosphor based on monoclinic Y2O3.

Surface SiO 2 coating strategy was used to enhance the photoluminescent properties of Eu3+ doped nanophosphor based on monoclinic Y 2 O 3. Laser-synthesized m -Y 2 O 3 :Eu3+ spherical nanoparticles with high crystallinity and diameter of ca. 18 nm were used as a core for the preparation of m -Y 2 O 3 :Eu3+@SiO 2 core-shell structures. According to HRTEM and HAADF-STEM data, a thin SiO 2 shell uniformly encapsulated the crystal core with a thickness of about 1.5 nm. The SiO 2 shell increases the absolute photoluminescence quantum yield of Eu3+ at λ = 395 nm excitation from 14 % to 68 %. To the best of our knowledge, the obtained quantum yield exceeds the known values for Eu3+ doped oxide-based nanophosphors and is comparable to those of some other commercial red microphosphors. The SiO 2 coating was shown to reduce the luminescence quenching effect associated with the annealing-induced migration of Eu3+ from the bulk to the surface of nanoparticles. The obtained results demonstrate that m -Y 2 O 3 :Eu3+@SiO 2 core-shell nanoparticles with intense red luminescence have significant potential for use in LEDs, high resolution displays, bioimaging technologies and in other solid-state lighting applications. [Display omitted] • SiO 2 coating strategy has been used to enhance the PLQY of m -Y 2 O 3 :Eu3+ nanophosphor. • The m -Y 2 O 3 :Eu3+ core with diameter of ca. 18 nm was prepared by laser synthesis. • The SiO 2 shell increases the PLQY of m -Y 2 O 3 :Eu3+ at λ ex = 395 nm from 14 % to 68 %. • Coating reduced the PL quenching associated with annealing-induced migration of Eu3+. [ABSTRACT FROM AUTHOR]