Tb3+ and Eu3+ co-doped Ba6Bi9B79O138: color-tunable phosphors by utilizing the host-sensitization effect of Bi3+ and enhancement of red emission upon heating
Tb3+ and Eu3+ co-doped Ba6Bi9B79O138: color-tunable phosphors by utilizing the host-sensitization effect of Bi3+ and enhancement of red emission upon heating
复制标题
Tb3 和 Eu3 共掺杂 Ba6Bi9B79O138：利用 Bi3 的主体敏化效应并在加热时增强红光发射的颜色可调荧光粉
DOI：
10.1039/c6nj03603a
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发表时间：
2017-03-07
影响因子：
3.3
通讯作者：
Yang, Tao
中科院分区：
文献类型：
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作者：
Gao, Yan;Sun, Xiaorui;Yang, Tao
为了利用Bi 3+的基质敏化作用，采用高温固相反应法制备了一系列Tb 3+和Eu 3+共掺杂的Ba 6 Bi 9 B79 O 138（BBBO）荧光粉。证实了基质中Bi ~（3+）向Tb ~（3+）和Eu ~（3+）以及Tb ~（3+）向Eu ~（3+）的能量传递过程。在紫外光激发下，可以同时观察到三种发光，包括主体中Bi 3+发光的蓝带、Tb 3+从D-5（4）→ F-7（J）（J = 6，5，4，3）跃迁的绿色谱线和Eu 3+从D-5（4）→ F-7（J）（J = 1，2，3，4）跃迁的红光谱线。因此，通过改变Tb ~（3+）/Eu ~（3+）的相对掺杂量和选择合适的激发光，可以合理地调节样品的总发射。在高温下的热稳定性进行了研究，在原位PL光谱。在279 nm激发下，BBBO：0.05Eu（3+）和BBBO：0.05Tb（3+），0.005Eu（3+）的红光发射都有明显的增强。特别是在后一种情况下，在150 ℃下的红色发射强度大约是在室温下的3倍，这是通过退火时Bi 3 + -> Eu 3+和Tb 3 + -> Eu 3+能量转移的效率增加来解释的。
A series of Tb3+ and Eu3+ co-doped Ba6Bi9B79O138 (BBBO) phosphors were prepared by high-temperature solid-state reactions in order to utilize the host-sensitization effect of Bi3+. Energy transfer processes from Bi3+ in the host to both Tb3+ and Eu3+, as well as from Tb3+ to Eu3+ were proved. Under UV-excitation, three emissions can be simultaneously observed in a single-phase phosphor, including a blue band attributed to Bi3+ emission in the host, green lines due to Tb3+ transitions of D-5(4) -> F-7(J) (J = 6, 5, 4, 3), and red lines due to Eu3+ transitions of D-5(4) -> F-7(J) (J = 1, 2, 3, 4). Thus, the total emission could be rationally tuned by varying the relative doping contents of Tb3+/Eu3+ and by selecting appropriate exciting irradiation. Thermal stability was investigated by in situ PL spectra at elevated temperatures. It is quite interesting to observe a significant enhancement of red emission in both BBBO:0.05Eu(3+) and BBBO:0.05Tb(3+), 0.005Eu(3+) excited at 279 nm. Especially in the latter case, the red emission intensity at 150 degrees C is roughly 3 times that at room temperature, which is explained by the increasing efficiency of Bi3+ -> Eu3+ and Tb3+ -> Eu3+ energy transfer upon annealing.