Synthesis and tunable emission from yellow-green to red-orange of Ca3MgSi2O8:Eu3+, Dy3+ phosphor

In this work, Ca3MgSi2O8:R (R = Dy3+, Eu3+, and Eu3+/Dy3+) phosphors are synthesized in air by using the high-emperature solid-state reaction method. The crystal phase, crystal structures, lifetimes, and luminescence properties are investigated. Ca3MgSi2O8:Eu3+ phosphor with excitation at 394 nm emits redorange light and its emission spectrum covers the region from 575 nm to 720 nm due to the D-5(0) -> F-7(0), F-7(1), F-7(2), F-7(3), and F-7(4) transitions of Eu3+ ion. Ca3MgSi2O8:Dy3+ phosphor under excitation at 350 nm exhibits yellow-green emission with four emission bands in the range of 460-500 nm, 550-600 nm, 650-680 nm, and 740-775 nm, which are attribuited to the F-4(9/2) -> H-6(15/2), H-6(13/2), H-6(11/2), and H-6(9/2) transitions of Dy3+ ion, respectively. The energy transfer from Dy3+ to Eu3+ ions in Ca3MgSi2O8:Eu3+, Dy3+ phosphor can be confirmed by the spectral properties. The tunable emission properties of Ca3MgSi2O8:Eu3+, Dy3+ phosphor from yellow-green to red-orange can be fulfilled by the change of the excitation wavelength or the concentration proportion between Dy3+ and Eu3+ ions. The luminous mechanism and energy transfer of Ca3MgSi2O8:Eu3+, Dy3+ phosphor are explained by the energy level diagrams of Eu3+ and Dy3+ ions. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this work, Ca3MgSi2O8:R (R = Dy3+, Eu3+, and Eu3+/Dy3+) phosphors were synthesized via high-temperature solid-state reaction method in air. The crystal phase, crystal structures, lifetimes, and luminescence properties of the phosphors were investigated. Ca3MgSi2O8:Eu3+ phosphor exhibited red-orange light under excitation at 394 nm, while Ca3MgSi2O8:Dy3+ phosphor emitted yellow-green light under excitation at 350 nm. The energy transfer from Dy3+ to Eu3+ ions in Ca3MgSi2O8:Eu3+, Dy3+ phosphor was confirmed, and the emission properties of the phosphor could be tuned by changing the excitation wavelength or the concentration proportion between Dy3+ and Eu3+ ions.