Host‐Sensitized Photoluminescence and Coordination Environment Evolution in Ba6(Bi1–xTbx)9B79O138 (0 ≤ x ≤ 1)
Host‐Sensitized Photoluminescence and Coordination Environment Evolution in Ba6(Bi1–xTbx)9B79O138 (0 ≤ x ≤ 1)
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DOI：
10.1002/ejic.201500622
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发表时间：
2015-10
影响因子：
2.3
通讯作者：
Qiaoqi Li;Rihong Cong;Wenliang Gao;Tao Yang
中科院分区：
文献类型：
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作者：
Qiaoqi Li;Rihong Cong;Wenliang Gao;Tao Yang
硼酸盐是众所周知的光学材料的候选人，在这里，我们特别感兴趣的是Ba 6 Bi 9 B79 O 138（BBBO），它具有有趣的层状结构和含Bi 3+的特性，促使我们探索其宿主敏化光致发光（PL）。制备了BBBO：xTb 3+（0 ≤ x ≤ 1）固溶体，并证实了其主体敏化光致发光，这是Bi 3+向Tb 3+有效能量转移的结果。此外，随着x的增加，Bi 3 +/Tb 3+的配位环境发生了变化.发现这种演变与PL光谱的变化相关。特别地，当x < 0.4时，青色/绿色的比率[定义为Tb 3+的I（5D 47 F6）/I（5D 47 F5）]的值为约0.28，并且在x = 0.9时其增加到0.71并且此后几乎保持恒定。为了更好地理解宿主敏化效应，还制备了Ba_6（RE_（0.3-y）Bi_（0.7））_9 B_（79）O_（138）（RE = La或Y，0 ≤ y ≤ 0.3），并且在两个系列中，Ba_6（RE_（0.1）Bi_（0.2）Tb_（0.7））_9 B_（79）O_（138）显示出最高的发射。
Borates are well-known candidates for optical materials and, here, we are particularly interested in Ba6Bi9B79O138 (BBBO), which has an interesting layered-type structure and Bi3+-containing characteristics that has prompt us to explore its host-sensitized photoluminescence (PL). Solid solutions of BBBO:xTb3+ (0 ≤ x ≤ 1) were prepared and its host-sensitized photoluminescence was confirmed, which is a result of the efficient Bi3+-to-Tb3+ energy transfer. Furthermore, an evolution of the coordination environments of the Bi3+/Tb3+ sites was observed when increasing x. This evolution was found to correlate to the variation of the PL spectra. In particular, the value of the ratio of cyan/green [defined as I(5D47F6)/I(5D47F5) of Tb3+] was about 0.28 when x < 0.4, and it increased to 0.71 at x = 0.9 and thereafter remained almost constant. Ba6(RE0.3–yBiyTb0.7)9B79O138 (RE = La or Y, 0 ≤ y ≤ 0.3) were also prepared for better understanding of the host-sensitization effect and in both series, Ba6(RE0.1Bi0.2Tb0.7)9B79O138 show the highest emission.