Abstract A series of emission color tunable Ce3+, Tb3+, and Eu3+ co-doped La2Si2O7 (LSO) phosphors have been prepared via a solid state reaction. The crystal structure, luminescence properties, and thermal stability of the phosphors were studied in this paper. There exists two kinds of energy transfer (ET) modes under UV excitation, namely, electric dipole-dipole interaction for Ce3+→Tb3+ and terbium bridge model [Ce3+→(Tb3+)n→Eu3+] for LSO:Ce3+,Tb3+,Eu3+ system. The emitting color of the phosphors can be tuned from green to yellow and eventually to orange-red through the Ce3+→Tb3+→Eu3+ energy transfer. Although codoping Tb3+ and Eu3+ into La2Si2O7:Ce3+ leads to the reduction of thermal stability, it still remains 80% for LSO:0.05Ce3+,0.8 Tb3+,0.02Eu3+ at 150 °C when compared to that at room temperature. The absolute quantum yield (QY) increases from 71.04% (LSO:0.05Ce3+) to 95.60% (LSO:0.05Ce3+, 0.6 Tb3+), while those of LSO:0.05Ce3+,yTb3+,0.02Eu3+ samples remain more than 70%. These results indicate that the phosphors can be candidates for application in phosphor-converted white light-emitting diodes (pc-WLEDs).

中文翻译：

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高效且热稳定的 La2Si2O7:Ce3+,Tb3+,Eu3+ 荧光粉：通过铽桥调节发射颜色

摘要 通过固态反应制备了一系列发射颜色可调的Ce3+、Tb3+和Eu3+共掺杂La2Si2O7(LSO)荧光粉。本文研究了荧光粉的晶体结构、发光性能和热稳定性。在紫外激发下存在两种能量转移(ET)模式，即Ce3+→Tb3+的电偶极-偶极相互作用和LSO的铽桥模型[Ce3+→(Tb3+)n→Eu3+]：Ce3+,Tb3+,Eu3+系统。通过Ce3+→Tb3+→Eu3+能量转移，荧光粉的发光颜色可以从绿色变为黄色，最终变为橙红色。尽管将 Tb3+ 和 Eu3+ 共掺杂到 La2Si2O7:Ce3+ 中会导致热稳定性降低，但与室温相比，LSO:0.05Ce3+,0.8 Tb3+,0.02Eu3+ 在 150 °C 时仍保持 80%。绝对量子产率 (QY) 从 71.04% (LSO:0.05Ce3+) 增加到 95.60% (LSO:0.05Ce3+, 0.6 Tb3+)，而 LSO:0.05Ce3+,yTb3+,0.02Eu3+ 样品的绝对量子产率仍然超过 70%。这些结果表明，该荧光粉可作为荧光粉转换白光发光二极管 (pc-WLED) 的候选应用。