Synthesis and tunable luminescent properties of Eu-doped Ca₂NaSiO₄F - Coexistence of the Eu²⁺ and Eu³⁺ centers

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• 作者：Mubiao Xie^a ; ^{xiemubiao@163.com} ; Dongyu Li^b ; Guoxian Zhu^a ; Rongkai Pan^a ; Xionghui Fu^c
• 关键词：Phosphors ; Luminescence ; White LED ; Optical materials
• 刊名：Results in Physics
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：6
• 期：Complete
• 页码：70-73
• 全文大小：1181 K
• 卷排序：6

文摘

Novel phosphors Ca2NaSiO4F:Eu were synthesized successfully by the conventional solid-state method in CO atmosphere, and their spectroscopic properties in UV−vis region were investigated. The photoluminescence properties show that Eu3+ ions were partially reduced to Eu2+ in Ca2NaSiO4F. As a result of radiation and re-absorption energy transfer from Eu2+ to Eu3+, both Eu2+ bluish-green emission at around 520 nm and Eu3+ red emission are observed in the emission spectra under the n-UV light excitation. Furthermore, the ratio between Eu2+ and Eu3+ emissions varies with increasing content of overall Eu. Because relative intensity of the red component from Eu3+ became systematically stronger, white light emission can be realized by combining the emission of Eu2+ and Eu3+ in a single host lattice under n-UV light excitation. These results indicate that the Ca2NaSiO4F:Eu phosphors have potential applications as a n-UV convertible phosphor for light-emitting diodes.