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Luminescent properties of LiBaPO4:RE (RE = Eu2+, Tb3+, Sm3+) phosphors for white light-emitting diodes
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Image of FIG. 1.
FIG. 1.

XRD patterns of LiBa1−x PO4:xRE phosphors with (a) RE = Eu2+, x = 0.05; (b) RE = Tb3+, x = 0.40; (c) RE = Sm3+, x = 0.06; and JCPDS card No. 14-0270; some weak peaks (#) and (*) are due to the materials BaO and LiSrPO4, respectively.

Image of FIG. 2.
FIG. 2.

Emission spectra of LiBaPO4 activated by (a) RE = Eu2+, (b) RE = Tb3+, and (c) RE = Sm3+ shown as a function of different activator concentrations measured at room temperature. The inset shows excitation spectra of maximum intensity observed for the activators.

Image of FIG. 3.
FIG. 3.

(Color online) The CIE 1931 chromaticity diagram of LiBa1-x PO4:xRE (RE = Eu2+, Tb3+, Sm3+) phosphors under various excitation wavelengths.

Image of FIG. 4.
FIG. 4.

(Color online) The PL decay curves of (a) Eu2+ emission (at 470 nm) under excitation in the 4f → 5d absorption band of the Eu2+ ion (370 nm), (b) Tb3+ emission (at 545 nm) under excitation in the 5D47F5 absorption band of the Tb3+ ion (370 nm), and (c) Sm3+ emission (at 545 nm) under excitation in the 4G5/26H7/2 absorption band of Sm3+ ion (370 nm). The inset shows decay time vs activation concentration of LiBaPO4 with different dopants.

Image of FIG. 5.
FIG. 5.

(Color online) (a) PL spectra excited at 350 nm of LiBa0.95PO4:0.05Eu2+ phosphor for various temperatures; the inset shows temperature-dependent relative emission intensity of LiBa0.95PO4:0.05Eu2+. (b) Activation energy for thermal quenching of LiBa0.95PO4:0.05Eu2+.

Image of FIG. 6.
FIG. 6.

(Color online) PL spectra of (a) LiBa0.60PO4:0.40Tb3+ and (b) LiBa0.94PO4:0.06Sm3+ for various temperatures; the two insets show the corresponding integrated emission intensity at different temperatures.

Image of FIG. 7.
FIG. 7.

(Color online) (a) Part of the energy levels scheme of LiBaPO4 doped with Tb3+, and Sm3+. (b) Schematic configurational coordinate diagrams that present possible mechanisms of temperature-dependent emission of Sm3+ in the LiBaPO4 host.


Generic image for table
Table I.

CIE chromaticity coordinates of RE-doped LiBaPO4 (RE = Eu2+, Tb3+, Sm3+).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Luminescent properties of LiBaPO4:RE (RE = Eu2+, Tb3+, Sm3+) phosphors for white light-emitting diodes