Photoluminescence properties and energy transfer in Ce³⁺/Dy³⁺ co‐doped Sr₃MgSi₂O₈ phosphors for potential application in ultraviolet white light‐emitting diodes

Abstract

Sr(3) MgSi(2) O(8) :Ce(3+) , Dy(3+) phosphors were prepared by a solid-state reaction technique and the photoluminescence properties were investigated. The emission spectra show not only a band due to Ce(3+) ions (403 nm) but also as a band due to Dy(3+) ions (480, 575 nm) (UV light excitation). The photoluminescence properties reveal that effective energy transfer occurs in Ce(3+) /Dy(3+) co-doped Sr(3) MgSi(2) O(8)phosphors, and the co-doping of Ce(3+) could enhance the emission intensity of Dy(3+) to a certain extent by transferring its energy to Dy(3+) . The Ce(3+) /Dy(3+) energy transfer was investigated by emission/excitation spectra, and photoluminescence decay behaviors. In Sr2.94 MgSi2 O8 :0.01Ce(3+) , 0.05Dy(3+) phosphors, the fluorescence lifetime of Dy(3+) (from 3.35 to 27.59 ns) is increased whereas that of Ce(3+) is greatly decreased (from 43.59 to 13.55 ns), and this provides indirect evidence of the Ce(3+) to Dy(3+) energy transfer. The varied emitted color of Sr(3) MgSi(2) O(8):Ce(3+) , Dy(3+) phosphors from blue to white were achieved by altering the concentration ratio of Ce(3+) and Dy(3+) . These results indicate Sr(3) MgSi(2) O(8):Ce(3+) , Dy(3+) may be as a candidate phosphor for white light-emitting diodes.

Energy Transfer from Ce3+ to Tb3+/Dy3+/Mn2+ in Ca9Ga(PO4)7 Phosphors: Synthesis, Structure and Tunable Multicolor Luminescent Properties

“…We measured the decay curves of Ce 3+ , which were collected from Ce 3+ and Tb 3+ co‐doped phosphor samples (See Figure ). The ET among Ce 3+ and Tb 3+ is also characterized by the changes of the fluorescence intensities, all of which decrease with increasing Tb 3+ concentrations . The efficiency of Ce 3+ ‐Tb 3+ ET is calculated with the formula below: …”

Synthesis, crystal structure, optical and thermal properties of lanthanide hydrogen-polyphosphates Ln[H(PO3)4] (Ln = Tb, Dy, Ho)

“…Under excitation at 375 nm Tb[H(PO 3 ) 4 ] exhibits sharp emission lines between 475 and 630 nm, which can be assigned to the 5 D 4 → 7 F 6 (488 nm), 5 D 4 → 7 F 5 (543 nm) showing the highest intensity, 5 D 4 → 7 F 4 (583 nm) and 5 D 4 → 7 F 3 (619 nm) transitions. [49][50][51] By reversing the Dy 3+ /Ce 3+ ratio and increasing the content of Ce 3+ to Ce 0.75 Dy 0.25 [H(PO 3 ) 4 ] an efficient energy transfer might be reached, which represents rather a substitution than a doping process. Under excitation at 349 nm Dy[H(PO 3 ) 4 ] exhibits sharp emission lines between 460 and 675 nm, which correspond to the ff electronic transitions 4 F 9/2 → 6 H 15/2 (482 nm), 4 F 9/2 → 6 H 13/2 (573 nm) and 4 F 9/2 → 6 H 11/2 (671 nm).…”

Energy Transfer Behavior and Color-Tunable Properties of Ca2Al2SiO7:RE3+ (RE3+ = Tm3+, Dy3+, Tm3+/Dy3+) for White-Emitting Phosphors

“…For several Dy 3+ -doped phosphors, the intensity of the yellow light emission is stronger than that of blue light emission; the mixed color therefore forms just stable yellow light. To obtain white light, it may be more feasible to dope Dy 3+ phosphors with other rare-earth ions, [12][13][14][15] as exemplified by Gd 2 (MoO 4 ) 3 :Dy 3+ / Eu 3+ , 12 Sr 3 MgSi 2 O 8 :Dy 3+ /Ce 3+ , 13 Ba 2 MgSi 2 O 7 :Dy 3+ / Eu 2+ , 14 and NaGdTiO 4 :Dy 3+ /Sm 3+ . 15 Moreover, the color coordinates of such phosphors can be modulated by codoping with Tm 3+ ; indeed, BaY 2-Si 3 O 10 :Tm 3+ /Dy 3+ , 16 KSr 4 (BO 3 ) 3 :Tm 3+ /Dy 3+ , 17 and Ca 9 Y(PO 4 ) 7 :Tm 3+ /Dy 3+18 single-phase white-lightemitting phosphors have been reported.…”