Site occupancy and luminescence properties of Ca3Ln(AlO)3(BO3)4:Ce3+,Tb3+,Mn2+ (Ln = Y, Gd)
Site occupancy and luminescence properties of Ca3Ln(AlO)3(BO3)4:Ce3+,Tb3+,Mn2+ (Ln = Y, Gd)
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DOI：
10.1039/c7tc00941k
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发表时间：
2017-05
影响因子：
6.4
通讯作者：
D. Wen;H. Kato;Makoto Kobayashi;Shunsuke Yamamoto;M. Mitsuishi;M. Kakihana
中科院分区：
文献类型：
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作者：
D. Wen;H. Kato;Makoto Kobayashi;Shunsuke Yamamoto;M. Mitsuishi;M. Kakihana
本文采用传统的固相反应法制备了新型单相白色发光材料Ca3Ln(AlO)3(BO3)4：Ce3+，Tb3+，Mn2+(Ln=Y，Gd)。首次对其晶体结构和光致发光性质进行了研究。Ca3Ln(AlO)_3(BO_3)_4的结构是由BO_3三角形连接的AlO_6八面体链条形成的。沿[001]方向，Ca/Ln离子填充在三角和六方隧道中。对于Ca3Ln(AlO)_3(BO_3)_4：Ce~(3+)和Ca3Ln(AlO)_3(BO_3)_4：Mn2+，大的Ce3+优先占据较小的配位，而小的Mn2+优先占据较大的配位，这是空间位阻的原因。由于阳离子无序，Ce3+的局域环境复杂，发射带极宽。在Ca3Ln(AlO)_3(BO_3)_4中，通过能量转移调节Ce3+-Tb3+或Ce3+-Mn2+的浓度，可以将发光颜色从蓝色调到绿色或红色。因此，蓝色、绿色和红色发射Ce3+、Tb3+和Mn2+的组合产生了白色发射。
In this work, novel single-phase white emitting Ca3Ln(AlO)3(BO3)4:Ce3+,Tb3+,Mn2+ (Ln = Y and Gd) phosphors were synthesized by a conventional solid-state reaction method. The crystal structure and photoluminescence properties were investigated for the first time. The structure of Ca3Ln(AlO)3(BO3)4 was formed by AlO6 octahedral chains interconnected by BO3 triangles. Along the [001] direction, the Ca/Ln cations fill in the trigonal and hexagonal tunnels. For Ca3Ln(AlO)3(BO3)4:Ce3+ and Ca3Ln(AlO)3(BO3)4:Mn2+, large Ce3+ preferred to occupy the smaller coordination site, while small Mn2+ occupied the larger coordination site, which was explained by the space hindrance. Due to the cation disorder, the local environment of Ce3+ was complicated and the emission band was extremely broad. In Ca3Ln(AlO)3(BO3)4, the emission color can be tuned from blue to green or red by tuning the Ce3+–Tb3+ or Ce3+–Mn2+ concentration based on energy transfer. Thus, the combination of blue, green and red emitting Ce3+, Tb3+ and Mn2+ generated white emission.