Blue-light-pumped wide-band red emission in a new Ce3+-activated oxide phosphor, BaCa2Y6O12:Ce3+: Melt synthesis and photoluminescence study based on crystallographic analyses
Blue-light-pumped wide-band red emission in a new Ce3+-activated oxide phosphor, BaCa2Y6O12:Ce3+: Melt synthesis and photoluminescence study based on crystallographic analyses
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DOI：
10.1016/j.jallcom.2019.05.155
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发表时间：
2019-08
影响因子：
6.2
通讯作者：
T. Hasegawa;Masato Iwaki;Sun Woog Kim;T. Ueda;K. Uematsu;K. Toda;Mineo Sato
中科院分区：
文献类型：
--
作者：
T. Hasegawa;Masato Iwaki;Sun Woog Kim;T. Ueda;K. Uematsu;K. Toda;Mineo Sato
基于提出的新材料设计概念，我们利用熔融合成技术，在弧成像炉上成功地发现了一种新的红色发光材料BaCa2Y6O12：Ce3+。用X-射线衍射数据进行Rietveld精修，得到了荧光粉的晶体结构，它与已报道的六方晶格BaCa2Y6O12具有相同的框架。然而，Ba和Ca原子之间的结构是部分无序的，Ba位的对称性从2a和2b的Wyackoff位置下降到4e。在460 nm的蓝光照射下，荧光粉呈现出红黄色的发射，并具有宽带光谱。发射光谱由四个高斯带组成，表明Ce3+被掺入了两个不同的位置，即以Ca~(2+)为主的位置和以Y~(3+)为主的位置，这可以用一个经验公式来估计，该公式可以根据结晶学数据和化学成分来确定发射波长。此外，通过对BaCa2Y6O12：Ce3+颗粒形貌的观察、Ce3+浓度的测量以及发光强度和发光寿命的热依赖关系分析，表明BaCa2Y6O12：Ce3+具有很好的应用前景。在晶体结构细化的基础上进行了晶场分析，揭示了发光机理。目前的工作包括一种独特的红色发光氧化物荧光粉材料设计概念的独特结果，这将对未来荧光粉材料的发展具有重要意义。
Based on a proposed new materials design concept, we succeeded in discovering a new red-emitting oxide phosphor, BaCa2Y6O12:Ce3+,viaa melt synthesis technique using an arc-imaging furnace. Rietveld refinement using X-ray diffraction data gave the crystal structure of the obtained phosphor, which has the same framework as the reported host lattice, hexagonal BaCa2Y6O12. However, the structure between the Ba and Ca atoms was partially disordered, and the site symmetry for the Ba site decreased from the 2a and 2b Wyckoff positions to 4e. The phosphor shows a reddish-yellow colour emission with a broad-band spectrum under blue-light irradiation at 460 nm. The emission spectrum was composed of four Gaussian bands, indicating Ce3+is incorporated into two different sites, Ca2+-dominant and Y3+sites, and this could be estimated using an empirical equation for determining the emission wavelength from crystallographic data and chemical compositions. Additionally, based on the observation of the particle morphology, the measurement of Ce3+concentration and the thermal dependence of the luminescence intensity and luminescence lifetime property, BaCa2Y6O12:Ce3+has high potential as a fundamental material. Crystal-field analysis based on the refinement of the crystal structure revealed the luminescence mechanism. The present work includes unique results on a distinct material design concept for a red-emitting oxide phosphor, which should have great significance for future phosphor material development.