Molten salt synthesis and luminescence of Dy³⁺‐doped Y₃Al₅O₁₂ phosphors

Abstract

Dy 3+ -doped Y 3 Al 5 O 12 phosphors were prepared at a relatively low temperature using molten salt synthesis. The phase of the prepared Dy 3+ -doped Y 3 Al 5 O 12 phosphors was confirmed using X-ray powder diffraction. Results indicated that Dy 3+ doping did not change the Y 3 Al 5 O 12 phase. Following excitation at 352 nm, emission spectra of the Dy 3+ -doped Y 3 Al 5 O 12 phosphors consisted of blue, yellow, and red emission bands. The influence of Dy 3+ concentration and excitation wavelength on emission was investigated. The ratio of yellow light to blue light varied with change in Dy 3+doping concentration, due to changes in the structure around Dy 3+ . Emission intensities also changed when the excitation wavelength was changed. This variation is luminescence generated a system for tunable white light for Dy 3+ -doped

Investigation of Luminescence Characteristics of SrLaGa3O7:Dy3+ Phosphors

“…Exciting at 342 nm, SrLaGa 3 O 7 :xDy 3+ phosphors have emission spectra containing three emission bands, which respectively result from 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 and 4 F 9/2 → 6 H 11/2 transitions of Dy 3+ . [11][12][13]18 The band deriving from 4 F 9/2 → 6 H 13/2 is strongest, indicating their sites deviate from the symmetrical center in SrLaGa 3 O 7 . 19 The Dy 3+ doping concentration has evident effect on emission intensity but scarcely affects peak wavelength and spectral shape.…”

“…Monitoring at 572 nm, the excitation spectra for all of SrLaGa 3 O 7 :xDy 3+ phosphors contain the excitation bands with similar peak wavelength. The excitation bands respectively result from 6 11,18 The excitation spectra of SrLaGa 3 O 7 :xDy 3+ phosphors almost cover from ultraviolet light region to blue light region. Among this series of excitation bands, the excitation intensity resulting from 6 H 15/2 → 6 P 5/2 transition is highest.…”

Enhancement of Mn4+ Emission by Means of Energy Transfer in Mg2Al4Si5O18:Dy3+, Mn4+ Phosphors

“…As we all know that 4 F 9/2 → 6 H 13/2 is a hypersensitive transition and it is affected highly by crystal environment around Dy 3+ . 40 The prominent emission band originating from 4 F 9/2 → 6 H 13/2 transition indicates that Dy 3+ ions occupy low symmetry sites without an inversion center. 41 Figure 2 also reveals that there is a spectral segistration between the emission spectrum of Mg 1.92 Dy 0.08 Al 4 Si 5 O 18 with the excitation spectrum of Mg 2 Al 3.90 Mn 0.10 Si 5 O 18 .…”

Aluminate-Based Nanostructured Luminescent Materials: Design of Processing and Functional Properties

“…Figure 3b shows the emission of Y 3-x Dy x Al 5 O 12 (x = 0.05, 0.10, 0.15, 0.20, and 0.25) phosphors, employing NaCl-KCl molten salt (ratio of the initial reagents and the NaCl-KCl mixture: 1:4). The YAG:Dy phosphor was fired at 1100 • C and washed with deionized water at least 12 times [36]. Both washing approaches were successfully applied, suggesting that the removal of the remaining salts was not an issue with the use of this synthesis route.…”