title: Tunable Luminescent Properties and Concentration-Dependent, Site-Preferable Distribution of Eu(2+) Ions in Silicate Glass for White LEDs Applications.
abstract: The design of luminescent materials with widely and continuously tunable excitation and emission is still a challenge in the field of advanced optical applications. In this paper, we reported a Eu(2+)-doped SiO2-Li2O-SrO-Al2O3-K2O-P2O5 (abbreviated as SLSAKP:Eu(2+)) silicate luminescent glass. Interestingly, it can give an intense tunable emission from cyan (474 nm) to yellowish-green (538 nm) simply by changing excitation wavelength and adjusting the concentration of Eu(2+) ions. The absorption spectra, photoluminescence excitation (PLE) and emission (PL) spectra, and decay curves reveal that there are rich and distinguishable local cation sites in SLSAKP glasses and that Eu(2+) ions show preferable site distribution at different concentrations, which offer the possibility to engineer the local site environment available for Eu(2+) ions. Luminescent glasses based color and white LED devices were successfully fabricated by combining the as-synthesized glass and a 385 nm n-UV LED or 450 nm blue LED chip, which demonstrates the potential application of the site engineering of luminescent glasses in advanced solid-state lighting in the future.
authors.forename: Xuejie
authors.initials: X
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Huang
authors.forename: Fengjuan
authors.initials: F
authors.lastname: Pan
authors.forename: Yan
authors.initials: Y
authors.lastname: Chen
authors.affiliation: §Department of Applied Chemistry, South China Agriculture University, Guangzhou, Guangdong 510642, China.
authors.forename: Bingfu
authors.initials: B
authors.lastname: Lei
authors.affiliation: ⊥School of Materials Science and Technology, South China University of Technology, Guangzhou 510640, China.
authors.forename: Mingying
authors.initials: M
authors.lastname: Peng
authors.forename: Mingmei
authors.initials: M
authors.lastname: Wu
keywords: Eu2+ ion; LED device; silicate glass; sites; tunable light