57.
Dy
3+, Eu
3+: NaLa(WO
4)
2 phosphors are successfully synthesized through the solid-state reaction technique. The phase-structure and morphology are measured via X-ray diffraction and energy dispersive spectrometry. The concentrations of Dy
3+, Eu
3+, La
3+, and W
6+ are measured via ICP. The absorption and excited spectra are presented, which indicate that a blue band ranging from 430 to 480 nm is suitable for excitation. Using a commercial blue LED with a wavelength of 450 nm as the excitation light source, emission spectra for samples with varying dopant concentration ratios of Dy
3+ to Eu
3+ are obtained, which show good tunable yellow and red emission. For the purpose of investigating white LED performance, CIE spectra and a white light photo are also presented. The results reveal that varying the dopant concentration ratio of Dy
3+ to Eu
3+ plays a key role in the warm-white performance. With increasing concentration of Eu
3+, the correlated color temperature decreases from 4069 to 3172 K, which indicates good warm-white performance.
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