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 1D2→3F4 electron transition (blue light) of Tm3+, 5D3→7FJ (J=4, 5, 6) and 5D4→7FJ (J=3, 4, 5, 6) electron transition (green light) of Tb3+ and 5D0-7F1, 5D0-7F2 and 5D0-7F3 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, Mg2Y2Al2Si2O12:0.03Tb3+, yEu3+, 0.05Tm3+ can emit white light with good temperature stability by the energy transfer.