Abstract
In this paper, we reported on the photoluminescence properties of novel Eu3+-activated KBaLu(MoO4)3 red-emitting phosphors. Under 395 and 465 nm excitations, the as-prepared samples gave bright sharp red emissions around 592, 615, 655, and 701 nm, corresponding to 5D0→7FJ (J = 1, 2, 3, and 4) transitions of Eu3+ ions. The 615 nm red emission due to the 5D0→7F2 transition was dominant in the emission spectra, indicating the Eu3+ ions occupied non-inversion centrosymmetric sites in KBaLu(MoO4)3 host lattice. Eu3+ doping concentration dependent luminescence properties were studied, and the KBaLu(MoO4)3:0.8Eu3+ sample exhibited the strongest emission intensity. The CIE color coordinates and color purity of the optimal KBaLu(MoO4)3:0.8Eu3+ sample were determined to be (0.6655, 0.3311) and 96.7%, respectively. Besides, temperature-dependent emission spectra demonstrated that the KBaLu(MoO4)3:0.8Eu3+ phosphors also exhibited excellent thermal stability (I423k/I303k = 88%) with activation energy △E of 0.204 eV. These obtained results indicated that the newly discovered KBaLu(MoO4)3:Eu3+ red phosphors were promising color converters for application in white light-emitting diodes and display devices.
Published Version
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