Luminescence and energy transfer of Eu/Mn co-doped SiO2–Al2O3–ZnO–K2O glass ceramics for white LEDs |
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Authors: | Renguang Ye Shiqing Xu Degang Deng Youjie Hua Huanping Wang Chenxia Li Shilong Zhao Lihui Huang |
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Affiliation: | College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China |
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Abstract: | Transparent Eu2+/Mn2+ co-doped new glass ceramics (GC) containing β-Zn2SiO4 nanocrystals were prepared under a reduced atmosphere. The optical properties of these samples have been investigated. The emission spectra of Eu2+/Mn2+ co-doped glass ceramics show two broadband peakings at 458 and 560 nm under ultraviolet radiation, which can be attributed to 4f65d1→4f7 transition of Eu2+ and 4T1(4G)→6A1(6S) transition of Mn2+, respectively. Energy transfer (ET) from Eu2+ to Mn2+ is discovered by directly observing significant overlap of the excitation spectrum of Mn2+ and the emission spectrum of Eu2+. ET from Eu2+ to Mn2+ in glass ceramics is further confirmed by fluorescence studies performed on the samples with various activator (Mn2+) concentrations. The optimal composition generates white light with chromaticity coordinates (0.291, 0.344). The results indicate that Eu2+/Mn2+ co-doped glass ceramics is potential material for white light-emitting diodes (LEDs). |
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Keywords: | Glass ceramics Luminescence Energy transfer White LEDs |
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