Luminescence and Energy Transfer of Li₂Y₄(MoO₄)₇: Ln³⁺ (Ln = Dy, Eu) Phosphors

Abstract

A series of novel Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) phosphors with color-tunable were prepared through solid-state reaction. The crystal structures, photoluminescence properties, energy transfer process, decay, and chromaticity coordinates were also investigated. The emission color of Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) phosphors were tunable from pale yellow to the nearly white position by adjusting the concentrations of Dy3+ and Eu3+ ions or converting the excitation wavelength from 353 nm to 391 nm, and η τ could reach 49.33% when y = 0.60. These results indicated that Li2Y4(MoO4)7: Ln3+ (Ln = Dy, Eu) may be served as color tunable phosphors.

Luminescence and Energy Transfer Properties of Color‐Tunable Dy3+, Eu3+ co‐Activated NaGdSiO4 Phosphor for WLED with Great Thermo‐Stability

“…As shown in Figure 10, the data fit is closest to linear when n = 10, which indicates that the Dy 3 + to Eu 3 + energy transfer is dominated by a quadrupole-quadrupole mechanism. [38] Figure 11 illustrates the energy transfer mechanism from Dy 3 + to Eu 3 + ions. As depicted in Figure 11, there exists a partial energy transfer process ET1 : [ 4 F 9/2 (Dy 3 + )!…”