Abstract In this paper, Ce3+/Tb3+ co-doped blue-green emitting Ba2Gd5B5O17 borate phosphors were prepared for the first time. Phase purity, crystal structure, photoluminescence properties, energy transfer, and thermal stability of the as-synthesized samples were studied in detailed. The Ce3+ ions singly doped Ba2Gd5B5O17:Ce3+ phosphors had a broad excitation band in the 300–400 nm spectral range peaking at 345 nm, and when excited at 345 nm they exhibited a broad blue emission band in the 350–700 nm wavelength range with a maximum at 450 nm. Energy transfer process from Ce3+ to Tb3+ ions took place in the Ce3+/Tb3+ co-doped Ba2Gd5B5O17 phosphors, resulting in color-tunable emission outputs. It was found that under the excitation of 345 nm, the emission spectra of Ba2Gd5B5O17:Ce3+,Tb3+ phosphors displayed the broad blue emission band of Ce3+ ions and the characteristic sharp green emission lines of Tb3+ ions. Moreover, the intensity ratio of Ce3+ blue emission to Tb3+ green emission was adjusted by increasing the Tb3+ doping concentration, and the Ce3+→Tb3+ energy transfer mechanism was studied. Furthermore, the thermal stability of Ba2Gd5B5O17:Ce3+,Tb3+ phosphors was estimated, and the activation energy of Ba2Gd5B5O17:0.008Ce3+,0.2 Tb3+ sample was calculated to be 0.205 eV. The obtained results revealed that blue-green emitting Ba2Gd5B5O17:Ce3+,Tb3+ borate phosphors have potential usage in the fabrication of near-UV based white LEDs.

中文翻译：

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用于白光 LED 的 Ba2Gd5B5O17:Ce3+/Tb3+ 硼酸盐磷光体的能量转移诱导颜色可调发射

摘要 本文首次制备了Ce3+/Tb3+共掺杂蓝绿光Ba2Gd5B5O17硼酸盐荧光粉。详细研究了合成样品的相纯度、晶体结构、光致发光特性、能量转移和热稳定性。Ce3+ 离子单掺杂 Ba2Gd5B5O17:Ce3+ 荧光粉在 300-400 nm 光谱范围内有一个宽的激发带，在 345 nm 处达到峰值，当在 345 nm 激发时，它们在 350-700 nm 波长范围内显示出宽的蓝色发射带最大波长为 450 nm。从 Ce3+ 到 Tb3+ 离子的能量转移过程发生在 Ce3+/Tb3+ 共掺杂 Ba2Gd5B5O17 磷光体中，导致颜色可调的发射输出。发现在345 nm激发下，Ba2Gd5B5O17:Ce3+的发射光谱，Tb3+ 荧光粉显示出 Ce3+ 离子的宽蓝色发射带和 Tb3+ 离子的特征性尖锐绿色发射线。此外，通过增加Tb3+掺杂浓度来调节Ce3+蓝色发射与Tb3+绿色发射的强度比，并研究了Ce3+→Tb3+的能量转移机制。此外，估计了 Ba2Gd5B5O17:Ce3+,Tb3+ 荧光粉的热稳定性，计算出 Ba2Gd5B5O17:0.008Ce3+,0.2 Tb3+ 样品的活化能为 0.205 eV。获得的结果表明，蓝绿光 Ba2Gd5B5O17:Ce3+,Tb3+ 硼酸盐荧光粉在近紫外光白光 LED 的制造中具有潜在用途。研究了Ce3+→Tb3+的能量传递机制。此外，估计了 Ba2Gd5B5O17:Ce3+,Tb3+ 荧光粉的热稳定性，计算出 Ba2Gd5B5O17:0.008Ce3+,0.2 Tb3+ 样品的活化能为 0.205 eV。获得的结果表明，蓝绿光 Ba2Gd5B5O17:Ce3+,Tb3+ 硼酸盐荧光粉在近紫外光白光 LED 的制造中具有潜在用途。研究了Ce3+→Tb3+的能量传递机制。此外，估计了 Ba2Gd5B5O17:Ce3+,Tb3+ 荧光粉的热稳定性，计算出 Ba2Gd5B5O17:0.008Ce3+,0.2 Tb3+ 样品的活化能为 0.205 eV。获得的结果表明，蓝绿光 Ba2Gd5B5O17:Ce3+,Tb3+ 硼酸盐荧光粉在近紫外光白光 LED 的制造中具有潜在用途。