Abstract Broadband near-infrared phosphors are highly desirable for food testing. Targeted Ca2LuHf2Al3O12:Cr3+ (CLHA:Cr3+) and Ca2LuHf2Al3O12:Ce3+,Cr3+ (CLHA:Ce3+,Cr3+) phosphors were synthesized by the conventional high-temperature solid state reaction. The CLHA:Cr3+ phosphor, with a good thermal stability, shows a red shift owing to radiation reabsorption and non-radiative transition with increasing Cr3+ content. For co-doped sample, the emission intensity of Cr3+ can be enhanced by three times due to the energy transfer from Ce3+ to Cr3+, which can be evidenced by a significant overlap between the PLE of Cr3+ single-doped phosphor and the PL of Ce3+ single-doped phosphor. In addition, the mechanism of energy transfer is identified as a quadrupole-quadrupole interaction according to decay lifetime and Dexter's energy transfer formula. The broadband NIR emission peaked at 775 nm of CLHA:Cr3+,Ce3+ phosphor shows a bright prospect in nondestructive quality-control analysis systems for food.

中文翻译：

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Cr3+、Ce3+共掺杂Ca2LuHf2Al3O12荧光粉的宽带近红外发光和能量转移

摘要 宽带近红外荧光粉非常适合用于食品检测。通过常规高温固相反应合成了目标 Ca2LuHf2Al3O12:Cr3+ (CLHA:Cr3+) 和 Ca2LuHf2Al3O12:Ce3+,Cr3+ (CLHA:Ce3+,Cr3+) 荧光粉。CLHA:Cr3+ 荧光粉具有良好的热稳定性，随着 Cr3+ 含量的增加，由于辐射重吸收和非辐射跃迁而出现红移。对于共掺杂样品，由于能量从 Ce3+ 转移到 Cr3+，Cr3+ 的发射强度可以提高三倍，这可以通过 Cr3+ 单掺杂荧光粉的 PLE 和 Ce3+ 单掺杂荧光粉的 PL 之间的显着重叠来证明。 -掺杂磷光体。此外，根据衰变寿命和德克斯特能量转移公式，能量转移机制被确定为四极-四极相互作用。