The high thermal stability of white emitting phosphor Mg2Y2Al2Si2O12:Dy3+,Eu3+,La3+/Lu3+ for white light emitting diodes

A series of Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺ was prepared using a solid-state method, and the phosphor emitted white light by tuning the ratio of Dy³⁺/Eu³⁺. The effects of La³⁺/Lu³⁺ on the structure and luminescence properties of Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺ were explored. Under the influence of bond length and twist, the luminescence intensity of the materials increased first and then decreased under excitation with ultraviolet light. The lattice distortion of the trivalent cation La³⁺-substituted Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺ and Eu³⁺ phosphors was reduced, the symmetry of polyhedron occupied by the luminescence centre improved, and the thermal stability of the luminescence centre improved to a certain extent. White light emitting diodes (LEDs) were fabricated by combining a 370 nm LED chip and the Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺,La³⁺ (Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺,Lu³⁺) phosphor. The results showed that Mg₂Y₂Al₂Si₂O₁₂:Dy³⁺,Eu³⁺,La³⁺/Lu³⁺ may have potential application in the area of white LEDs.