Near ultraviolet excitable cyan-green phosphors of Ba<sub>6</sub>La<sub>2</sub>Al<sub>3</sub>ScO<sub>15</sub>:Ce<sup>3+</sup> and Ba<sub>6</sub>La<sub>2</sub>Al<sub>3</sub>ScO<sub>15</sub>:Ce<sup>3+</sup>,Tb<sup>3+</sup>: investigations on the crystal str
Near ultraviolet excitable cyan-green phosphors of Ba<sub>6</sub>La<sub>2</sub>Al<sub>3</sub>ScO<sub>15</sub>:Ce<sup>3+</sup> and Ba<sub>6</sub>La<sub>2</sub>Al<sub>3</sub>ScO<sub>15</sub>:Ce<sup>3+</sup>,Tb<sup>3+</sup>: investigations on the crystal str
复制标题
Ba<sub>6</sub>La<sub>2</sub>Al<sub>3</sub>ScO<sub>15</sub>:Ce<sup>3 近紫外激发青绿荧光粉
DOI：
10.1039/d3dt00383c
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发表时间：
2023
影响因子：
4
通讯作者：
Sato Mineo
中科院分区：
文献类型：
--
作者：
Iwaki Masato;Onodera Mizuho;Uematsu Kazuyoshi;Toda Kenji;Sato Mineo
在光学器件开发的能量转换过程中，从 Ce3+ 到 Tb3+ 的能量转移是可行的，特别是磷光体转换白光 LED (pc-wLED)。不幸的是，大多数Ce3+和Tb3+共掺杂的能量传输荧光粉在405 nm左右的近紫外光和蓝光激发下吸收较弱，使得它们不能用作近紫外或蓝光LED。在本研究中，通过常规固相反应成功合成了与现有Ba6La2(Al,Fe)4O15同构的新型能量转移发光材料Ba6La2Al3ScO15:Ce3+,Tb3+。该荧光粉在405 nm近紫外光下显示出Ce3+的宽青色发射和Tb3+的窄绿光发射，几乎位于近紫外LED的发射波长处。发射寿命测量证明了从 Ce3+ 到 Tb3+ 的能量转移的发生。基于公式化的能量转移模型（例如 Inokuti-Hirayama、Yokota-Tanimota 和 Martin 模型）的寿命分析表明，从 Ce3+ 到 Tb3+ 的能量转移过程主要通过偶极-偶极相互作用进行，Ce3+ 供体之间的迁移较低。
An energy transfer from Ce3+ to Tb3+ is feasible in energy transition processes for the development of optical devices, especially phosphor-converted white LEDs (pc-wLEDs). Most of the energy transfer phosphors co-doped with Ce3+ and Tb3+, unfortunately, have weak absorption under a near-ultraviolet light of around 405 nm and blue light excitation, making them incapable for use as near ultraviolet or blue LEDs. In this study, novel energy transfer luminescent materials, Ba6La2Al3ScO15:Ce3+,Tb3+, isostructural with existing Ba6La2(Al,Fe)4O15, were successfully synthesized through a conventional solid-state reaction as a single phase. The phosphors showed a broad cyan emission of Ce3+ and narrow green emissions of Tb3+ under a near-ultraviolet light of 405 nm, which was nearly located at an emission wavelength of near-ultraviolet LEDs. The occurrence of energy transfer from Ce3+ to Tb3+ was evidenced by emission lifetime measurements. The lifetime analysis based on formulated energy transfer models, such as Inokuti–Hirayama, Yokota–Tanimota and Martin models, revealed that an energy transfer process from Ce3+ to Tb3+ took place dominantly by a dipole–dipole interaction with low migration among the donors of Ce3+.