Cr3+掺杂Ca4HfGe3O12宽带近红外荧光粉的发光特性及应用
Luminescence characteristics and device applications of Cr3+-doped Ca4HfGe3O12 broadband near-infrared phosphors
作者单位E-mail
绳星星 新疆第二医学院生物医学工程学院, 克拉玛依 834000 1531352712@qq.com 
肖峰 新疆第二医学院生物医学工程学院, 克拉玛依 834000  
吕锦彬 新疆第二医学院生物医学工程学院, 克拉玛依 834000  
摘要: 近红外荧光粉在生物活体成像领域展现出重要的应用前景。但活体成像用近红外荧光粉存在种类匮乏、耐温性差等瓶颈问题。采用固相法合成了宽带近红外Ca4HfGe3O12xCr3+(0≤x≤0.09)荧光粉。X射线衍射和能谱分析的结果表明Cr3+离子成功进入Ca4HfGe3O12晶格。在469 nm蓝光激发下,Ca4HfGe3O12∶xCr3+荧光粉发射出690~1 200 nm的宽带近红外光,峰值波长为825 nm (4T2-4A2),半高宽达到141 nm,Cr3+掺杂最佳浓度为0.03。依据激发光谱峰形和寿命衰减行为,证实Cr3+仅占据基质中一种阳离子格位。Ca4HfGe3O12∶0.03Cr3+荧光粉的荧光量子效率为33.63%,该荧光粉发射光谱在400 K下的积分面积为室温下的60.5%,表明该样品具有优良的热稳定性。采用自制近红外荧光粉转换器件照射人手掌和滤波片遮挡的水果,观察到清晰地静脉血管和遮挡水果的轮廓。
关键词: 热稳定性  Ca4HfGe3O12  近红外荧光粉  Cr3+离子  发光材料
基金项目: 自治区高校基本科研业务费科研项目、新疆第二医学院青年科学基金(No.QK202204)和大学生创新创业训练计划项目(No.202213560001)资助。
Abstract: Near-infrared phosphor has shown an important application prospect in the fields of living organism imaging. However, the near-infrared phosphor for organism imaging has some bottleneck problems such as a lack of variety and poor thermal stability. Broadband near-infrared Ca4HfGe3O12xCr3+ (0≤x≤0.09) phosphors were synthesized by the solid phase method. X-ray diffraction and energy spectrum analysis showed that Cr3+ ions successfully entered the Ca4HfGe3O12 crystal lattice. Upon 469 nm excitation, Ca4HfGe3O12xCr3+ phosphors presented a width emission band covering 690-1 200 nm (strongest peak of 825 nm for 4T2-4A2, bandwidth of 141 nm) with a fluorescence quantum efficiency of 33.63% (x=0.03), which exhibited good thermal stability, 60.5% of room temperature intensity at 400 K. The excitation peak shape and lifetime decay behavior results showed that Cr3+ occupies only one cation sites in the matrix. In addition, the self-made near-infrared phosphor conversion device was used to illuminate the palm of the human hand and the fruit shielded by the 700 nm filter, and the venous vessels and the shelterfruit outline were clearly observed.
Keywords: thermal stability  Ca4HfGe3O12  near-infrared phosphor  Cr3+ ions  optical material
投稿时间:2023-07-10 修订日期:2023-11-17
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绳星星,肖峰,吕锦彬.Cr3+掺杂Ca4HfGe3O12宽带近红外荧光粉的发光特性及应用[J].无机化学学报,2024,40(2):345-352.
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