Single-component white emitting phosphor Mg2Y2Al2Si2O12:Tb3+, Eu3+, Tm3+ for white LEDs

A series of Tb3+, Eu3+, Tm3+ doped Mg2Y2Al2Si2O12(MYAS) phosphors were synthesized by high temperature solid-state method. The emission spectra and energy transfer between lanthanide ions in the materials were studied in detail. Under the excitation of near ultraviolet light, the emission spectra of Mg2Y2Al2Si2O12:Tb3+, Eu3+, Tm3+ phosphors show visible emission peaks of Tb3+, Eu3+, Tm3+, mainly including D-1(2)-> F-3(4) electron transition (blue light) of Tm3+, D-5(3)-> F-7(J(J=4,5,6)) and D-5(4)-> F-7(J(J=3,4,5,6)) electron transition (green light) of Tb3+ and D-5(0)-F-7(1), D-5(0)-F-7(2) and D-5(0)-F-7(3) electron transition (red light) of Eu3+. By measuring the emission spectrum, excitation spectrum and fluorescence lifetime of Mg2Y2Al2Si2O12:Tb3+, Eu3+ and Mg2Y2Al2Si2O12:Tm3+, Eu3+ phosphors, it is proved that the energy transfer mechanisms between Tb3+-Eu3+ and Tm3+-Eu3+ in the matrix Mg2Y2Al2Si2O12 are dipole-quadrupole interaction and dipole-dipole interaction, respectively. By changing the concentration of Tb3+, Eu3+, Tm3+ in the matrix, phosphors with adjustable colors from green to red and from blue to red can be obtained, importantly, Mg2Y2Al2Si2O12:0.03Tb(3+), yEu(3+), 0.05Tm(3+) can emit white light with good temperature stability by the energy transfer. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

A series of Tb3+, Eu3+, Tm3+ doped Mg2Y2Al2Si2O12(MYAS) phosphors were synthesized by high temperature solid-state method. The emission spectra and energy transfer between the lanthanide ions in the materials were studied in detail.