Abstract Herein, a set of tetragonal Tm3+, Eu3+ doped 3D umbrella-like LaOCl phosphors was synthesized to realize wide range white light emitting. The energy transfer between Tm3+ and Eu3+ ions was observed in LaOCl:Tm3+, Eu3+ system. Multiple evidences clarified conjointly the energy transfer properties involving overlap spectra, changes of emission spectra, and fluorescent decay times. The mechanism of energy transfer from Tm3+ to Eu3+ in the LaOCl host was discussed in detail. The emission spectra of LaOCl:Tm3+, Eu3+ system contain blue light from Tm3+ transition, green and red light from Eu3+ transition, which involves three primary colors constituting white light. Thereby, under excitation at 229 nm, a relatively large range of adjustable white light emission can be reached due to the energy transfer from Tm3+ to Eu3+ in LaOCl host, when percentages of sensitizer and activator are adjusted. The finding clarifies these materials as promising for potential application in near ultraviolet based white light emitting diodes.

中文翻译：

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基于从 Tm 3+ 到 Eu 3+ 的能量转移实现单相 LaOCl 中的白光发射

摘要 本文合成了一组四方晶Tm3+、Eu3+掺杂3D伞状LaOCl荧光粉以实现宽范围白光发射。在 LaOCl:Tm3+、Eu3+ 体系中观察到 Tm3+ 和 Eu3+ 离子之间的能量转移。多项证据共同阐明了涉及重叠光谱、发射光谱变化和荧光衰减时间的能量转移特性。详细讨论了 LaOCl 主体中从 Tm3+ 到 Eu3+ 的能量转移机制。LaOCl:Tm3+、Eu3+体系的发射光谱包含来自Tm3+跃迁的蓝光、来自Eu3+跃迁的绿光和红光，其中涉及构成白光的三基色。因此，在 229 nm 激发下，由于 LaOCl 主体中从 Tm3+ 到 Eu3+ 的能量转移，可以达到较大范围的可调白光发射，当调整敏化剂和活化剂的百分比时。这一发现阐明了这些材料在基于近紫外线的白光发光二极管中的潜在应用前景。