4.7 Article

Novel color tunable LaCaGaO4:Bi3+,Eu3+ phosphors for high color rendering warm white LEDs

期刊

JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 106, 期 11, 页码 6617-6629

出版社

WILEY
DOI: 10.1111/jace.19255

关键词

energy transfer; multicolor tunable; phosphor; white LED

向作者/读者索取更多资源

A series of LaCaGaO4:xBi(3+),yEu(3+) phosphors with adjustable emission colors were synthesized, and the crystal structures and luminescence properties of the phosphors were analyzed in detail. The energy transfer between Bi3+ and Eu3+ ions was studied, and the emission color of the phosphors could be changed by adjusting the concentration of Eu3+. The phosphors exhibited good performance in white light-emitting diode devices, indicating their potential for warm white lighting applications.
A series of LaCaGaO4:xBi(3+),yEu(3+) (x = 0.002-0.04, y = 0.02-0.45) phosphors with adjustable emission colors were synthesized by high-temperature solid-state reaction. The samples were identified as pure phases by X-ray diffraction and Rietveld refinement, and the crystal structures were analyzed in detail. The LaCaGaO4:xBi(3+) phosphor shows an intense blue emission under near-ultraviolet excitation, originating from the P-3(1) -> S-1(0) transition. The spectrum analysis reveals that the Bi3+ ions occupy two luminescence centers in the LaCaGaO4 host and that energy transfer can occur. A model of the energy transfer between the Bi3+ and Eu3+ ions was also created and studied in detail. As the Eu3+-concentration increased, the emission color of the LaCaGaO4:0.005Bi(3+),yEu(3+) phosphor changed from blue to pink to red. In addition, the fluorescence lifetime, quantum yield, thermal stability, and other properties of the phosphors were characterized and analyzed. Finally, two white light-emitting diode devices with R-a values of 96.6 and 95 and correlated color temperatures of 4578 and 3324 K were fabricated, indicating the potential of phosphors for warm white lighting applications.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据