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

In this work, Ca 3 MgSi 2 O 8 :R ( R  = Dy 3+ , Eu 3+ , and Eu 3+ /Dy 3+ ) 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. Ca 3 MgSi 2 O 8 :Eu 3+ phosphor with excitation at 394 nm emits red-orange light and its emission spectrum covers the region from 575 nm to 720 nm due to the 5 D 0  →  7 F 0 , 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Ca 3 MgSi 2 O 8 :Dy 3+ 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 4 F 9/2  →  6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 transitions of Dy 3+ ion, respectively. The energy transfer from Dy 3+ to Eu 3+ ions in Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor can be confirmed by the spectral properties. The tunable emission properties of Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor from yellow-green to red-orange can be fulfilled by the change of the excitation wavelength or the concentration proportion between Dy 3+ and Eu 3+ ions. The luminous mechanism and energy transfer of Ca 3 MgSi 2 O 8 :Eu 3+ , Dy 3+ phosphor are explained by the energy level diagrams of Eu 3+ and Dy 3+ ions.