TY - JOUR
T1 - Synthesis and photoluminescence properties of color-tunable BaLa 2WO7:Eu3+ phosphor
AU - Yan, Shao An
AU - Chang, Yee Shin
AU - Hwang, Weng Sing
AU - Chang, Yen Hwei
AU - Yoshimura, Masahiro
AU - Hwang, Chii Shyang
N1 - Funding Information:
The authors would like to thank the Bureau of Energy, Ministry of Economic Affairs ( 99-D0204-2 ) in Taiwan for financially supporting this research.
PY - 2011/5/12
Y1 - 2011/5/12
N2 - 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-xEuxWO 7 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 5D 0 → 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.
AB - 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-xEuxWO 7 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 5D 0 → 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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U2 - 10.1016/j.jallcom.2011.02.103
DO - 10.1016/j.jallcom.2011.02.103
M3 - Article
AN - SCOPUS:79953835543
VL - 509
SP - 5777
EP - 5782
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
SN - 0925-8388
IS - 19
ER -