Synthesis and photoluminescence properties of color-tunable BaLa2WO7:Eu phosphor |
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Authors: | Shao-An YanYee-Shin Chang Weng-Sing Hwang Yen-Hwei ChangMasahiro Yoshimura Chii-Shyang Hwang |
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Affiliation: | a Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan b Department of Electronic Engineering, National Formosa University, Huwei, Yunlin 632, Taiwan |
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Abstract: | Color-tunable phosphors BaLa2−xEuxWO7 were synthesized via a solid-state reaction. The absorption, excitation, emission and decay curves were obtained to study the luminescence properties. The experimental results indicate that BaLa2−xEuxWO7 phosphors have two regions in the excitation spectra: one is assigned to the charge-transfer state (CTS) band at about 338 nm, and the other is assigned to the intra-4f transitions at 360-600 nm. The emission spectra of BaLa2−xEuxWO7 phosphors excited at 395 nm exhibit a series of sharp peaks, which are attributed to the 5D0 → 7FJ (J = 0, 1, 2, 3, 4) transitions. Luminescence from higher excited states, such as 5D1, 5D2, and 5D3, were also observed at low Eu3+ concentration. The optimal emission intensity of 5D0 → 7F2 red emission is at x = 0.4 (BaLa1.6Eu0.4WO7). The chromaticity coordinates of BaLa2−xEuxWO7 phosphors vary with Eu3+ content from white, orange-red, to red, making it a candidate for a white-light-emitting phosphor in UV-LEDs. |
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Keywords: | Phosphor BaLa2WO7 Europium doping Color-tunable |
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