Color tunable single-phase Eu2+ and Ce3+ co-activated Sr2LiAlO4 phosphors

被引：28

作者：

Ha, Jungmin ^{[1
]}

Kim, Yoon Hwa ^{[2
]}

Novitskaya, Ekaterina ^{[3
]}

Wang, Zhenbin ^{[4
]}

Sanchez, Maritza ^{[1
]}

Graeve, Olivia A. ^{[1
,3
]}

Ong, Shyue Ping ^{[4
]}

Im, Won Bin ^{[2
]}

McKittrick, Joanna ^{[1
,3
]}

机构：

[1] Univ Calif San Diego, Mat Sci & Engn Program, 9500 Gilman Dr, La Jolla, CA 92093 USA

[2] Chonnam Natl Univ, Sch Mat Sci & Engn, 77 Yongbong Ro, Gwangju 61186, South Korea

[3] Univ Calif San Diego, Dept Mech & Aerosp Engn, 9500 Gilman Dr, La Jolla, CA 92093 USA

[4] Univ Calif San Diego, Dept Nanoengn, 9500 Gilman Dr, La Jolla, CA 92093 USA

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2019年 / 7卷 / 25期

基金：

美国国家科学基金会;

关键词：

ENERGY-TRANSFER; WHITE-LIGHT; LUMINESCENCE PROPERTIES; QUANTUM EFFICIENCY; MN2+ PHOSPHOR; PHOTOLUMINESCENCE; TB3+; MECHANISM; SHIFT; EU-2+;

D O I：

10.1039/c8tc05777j

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High purity Eu2+ and Ce3+ singly and co-activated Sr2LiAlO4 phosphors were successfully synthesized through a facile combustion reaction. Fabrication of color tunable, single-phase phosphors was achieved by varying the Eu2+/Ce3+ ratio that utilized the energy transfer between Ce3+ and Eu2+. For the singly activated compositions, the highest quantum efficiencies were 25% and 40% for Sr1.998Eu0.002LiAlO4 and Sr1.998Ce0.002LiAlO4, respectively. The emission of Sr2LiAlO4:Ce3+ and the excitation of Sr2LiAlO4:Eu2+ overlap in the range of 400 nm-500 nm, so that energy transfer from Ce3+ -> Eu2+ takes place. The emission color of Eu2+ and Ce3+ co-activated Sr2LiAlO4 changes from blue, to cool-white, to green depending on the activator concentrations. The maximum quantum efficiency of Eu2+ and Ce3+ co-activated Sr2LiAlO4 was 55%, a 40% increase over the singly activated phosphors, which demonstrates that the quantum efficiency improves by co-activation.

引用

页码：7734 / 7744

页数：11

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