Synthesis and tunable luminescent properties of Eu-doped Ca 2 NaSiO 4 F - Coexistence of the Eu 2+ and Eu 3+ centers
Synthesis and tunable luminescent properties of Eu-doped Ca 2 NaSiO 4 F - Coexistence of the Eu 2+ and Eu 3+ centers
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DOI：
10.1016/j.rinp.2016.01.019
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发表时间：
2016
影响因子：
5.3
通讯作者：
Mubiao Xie;Dongyu Li;Guo-xian Zhu;Rongkai Pan;Xionghui Fu
中科院分区：
文献类型：
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作者：
Mubiao Xie;Dongyu Li;Guo-xian Zhu;Rongkai Pan;Xionghui Fu
在CO气氛下采用传统的固相法成功合成了新型荧光粉Ca 2NaSiO 4 F：Eu，并研究了其紫外可见光谱性质。光致发光特性表明，在Ca 2NaSiO 4F中，Eu 3+离子被部分还原为Eu 2+。由于Eu 2+向Eu 3+的辐射和再吸收能量转移，在n-UV光激发下，在发射光谱中观察到Eu 2+在520 nm附近的蓝绿色发射和Eu 3+的红色发射。此外，Eu 2+和Eu 3+发射之间的比率随着总Eu含量的增加而变化。由于Eu 3+的红色成分的相对强度系统地变强，因此在n-UV光激发下，可以通过在单个基质晶格中组合Eu 2+和Eu 3+的发射来实现白色发光。这些结果表明，Ca 2NaSiO 4F：Eu荧光粉作为发光二极管的n-UV转换荧光粉具有潜在的应用。
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.