Synthesis, adjustable-color emission and energy transfer of Ba2MgSi2O7:Sm3+, Bi3+ phosphors

Ba2MgSi2O7:M (M = Bi 3 + , Sm 3 + , Sm 3 + /Bi 3 + ) phosphors are synthesized in air by the high-temperature solid-state reaction method. All samples are confirmed to be a pure phase. With a 316 nm excitation wavelength, Ba 2 MgSi 2 O 7 :Bi 3 + shows blue-white emission including a broad emission band in the range of 340 - 750 nm, and Ba 2 MgSi 2 O 7 :Sm 3 + , Bi 3 + emits a adjustable-color light with the change of the ratio of Sm 3 + to Bi 3 + ions. Under excited at 402 nm, Ba 2 MgSi 2 O 7 :Sm 3 + and Ba 2 MgSi 2 O 7 :Sm 3 + , Bi 3 + emit orange-red light with emission spectrum region from 545 nm to 750 nm, which contain four emission bands peaking at similar to 560, 598, 646 and 704 nm due to the 4 G 5/2 -> 6 H 5/2 , 6 H 7/2 , 6 H 9/2 , and 6 H 11/2 transitions of Sm 3 + ion, respectively. Ba 2 MgSi 2 O 7 :Sm 3 + , Bi 3 + under excitation at 316 nm can show a whitecolor emission by changing the ratio between Sm 3 + and Bi 3 + ions. Lifetimes of samples decrease with increasing doped ion (Sm 3 + or Bi 3 + ) concentration. We explain the luminous mechanism of samples by the schematic energy level diagrams of Bi 3 + and Sm 3 + ions in Ba 2 MgSi 2 O 7 :Sm 3 + , Bi 3 + . (c) 2022 Published by Elsevier B.V.

Automated summary

Ba2MgSi2O7:M (M = Bi3+, Sm3+, Sm3+/Bi3+) phosphors were synthesized in air by the high-temperature solid-state reaction method. The emission properties of these phosphors were investigated, and they exhibited different emission colors depending on the doping ions and their ratios. The luminous mechanism of the phosphors was explained by energy level diagrams of Bi3+ and Sm3+ ions in Ba2MgSi2O7:Sm3+, Bi3+.