Color tunable single-phase Eu2+ and Ce3+ co-activated Sr2LiAlO4 phosphors
- Authors
- Ha, Jungmin; Kim, Yoon Hwa; Novitskaya, Ekaterina; Wang, Zhenbin; Sanchez, Maritza; Graeve, Olivia A.; Ong, Shyue Ping; Im, Won Bin; McKittrick, Joanna
- Issue Date
- Jul-2019
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.7, no.25, pp.7734 - 7744
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 7
- Number
- 25
- Start Page
- 7734
- End Page
- 7744
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/13306
- DOI
- 10.1039/c8tc05777j
- ISSN
- 2050-7526
- Abstract
- 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.
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