Abstract Recently, phosphors like lanthanide-ion-doped chloroapatite M5(PO4)3Cl (M = Ca, Sr, Ba) are successfully captured intensive investigations due to their potential applications in UV-LED and solid-state lasers devices. However, how to improve its luminescent efficiency or explore its potential applications are still a challenge so far. It is largely due to the defect levels induced by those lanthanide ions, especially the knowledge of their positions relative to the host bands, is unclear, which is the first requirement to understand the mechanisms of their luminescent properties. In this work, we show how the quenching of Ce3+/Eu3+ doped chloroapatite materials responds to their position relative to their conduction bands through thermoluminescenc (TL), photo-spectroscopic measurements and first-principle calculations in detail. We believe this work would provide a comprehensive understanding the underlying luminescent mechanism of the lanthanide-ion doped chloroapatite M5(PO4)3Cl (M = Ca, Sr, Ba) so far and also give a valuable guidance for the development of high efficient new chloroapatite phosphors in the future.

中文翻译：

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Ce3+ 和 Eu3+ 掺杂的氯磷灰石磷光体 M5(PO4)3Cl (M = Ca、Sr、Ba) 的缺陷水平和 VUV/UV 发光

摘要 最近，镧系离子掺杂的氯磷灰石 M5(PO4)3Cl (M = Ca, Sr, Ba) 等荧光粉因其在 UV-LED 和固态激光器中的潜在应用而被成功地捕获。然而，如何提高其发光效率或探索其潜在应用目前仍是一个挑战。这主要是由于这些镧系元素离子引起的缺陷水平，特别是它们相对于主带位置的知识尚不清楚，这是了解其发光特性机制的首要条件。在这项工作中，我们通过热致发光 (TL)、光谱测量和第一性原理计算详细展示了 Ce3+/Eu3+ 掺杂的氯磷灰石材料的猝灭如何响应其相对于其导带的位置。