YAG粉末材料中Cr<sup>3+</sup>敏化的Yb<sup>3+</sup>近红外发光性质

YAG粉末材料中Cr³⁺敏化的Yb³⁺近红外发光性质

基金项目: 国家自然科学基金资助项目(No.11174276,No.11174278)

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

摘要: 采用高温固相反应法合成了YAG: 0.02Cr³⁺,yYb³⁺系列粉末材料,研究了该系列材料在近红外区域的发光特性,主要包括Cr³⁺,Yb³⁺的发光性质、Cr³⁺: ⁴T₂和Yb³⁺: ²F_5/2能级辐射跃迁寿命以及其布居时间的比较,给出了Yb³⁺最佳掺杂量为10%。实验表明:通过Cr³⁺→Yb³⁺能量传递,实现了Yb³⁺在1 000 nm附近近红外发光的增强,这对进一步提高c-Si太阳能电池转换效率打下了坚实基础。
- Cr³⁺ /
- Yb³⁺ /
- 近红外发光 /
- 能量传递
Abstract: YAG: 0.02Cr³⁺,yYb³⁺ powder samples are prepared by high temperature solid-phase reaction method in this paper. Near-infrared emission properties of these powder materials are investigated including emission properties of Cr³⁺ and Yb³⁺, luminescence lifetimes of Cr³⁺: ⁴T₂ and Yb³⁺: ²F_5/2 and comparison of their population time. Optimal doping concentration of Yb³⁺(10%) is given. Experiments indicate that the broadband spectral conversion makes the Yb³⁺: ²F_5/2→²F_7/2 radiation transition obtain a favorable increase around 1 000 nm by the efficient energy transfer from Cr³⁺ to Yb³⁺, which laids a solid foundation to enhance solar photovoltaic conversion efficiency.
- Cr³⁺ /
- Yb³⁺ /
- near-infrared emission /
- energy transfer

图 1 YAG∶0.05Cr³⁺,0.10Yb³⁺样品和YAG(JCPDS # 72-1315)标准XRD谱图

Figure 1. XRD patterns of YAG∶0.05Cr³⁺,0.10Yb³⁺ powder sample and literature data of corresponding bulk materials with crystal structure for cubic YAG(JCPDS # 72-1315)

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图 2 590 nm光激发下的Y₃Al₅O₁₂∶0.02Cr³⁺,yYb³⁺样品(y=0.05, 0.10,0.20)可见(a)和近红外发光光谱(b)

Figure 2. Vis(a) and NIR(b) emission spectra in Y₃Al₅O₁₂∶0.02Cr³⁺,yYb³⁺ sample(y=0.05, 0.10,0.20) under 590 nm excitation

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图 3 Y₃Al₅O₁₂∶0.02Cr³⁺和Y₃Al₅O₁₂∶0.02Cr³⁺,0.10Yb³⁺样品中590 nm光激发的Cr³⁺ ∶⁴T₂→⁴A₂(a)和Yb³⁺∶²F_5/2→²F_7/2(b)辐射跃迁的衰减曲线

Figure 3. Decay curves of Cr³⁺∶⁴T₂→⁴A₂(a) and Yb³⁺∶²F_5/2→²F_7/2 radiation transition(b) in Y₃Al₅O₁₂∶0.02Cr³⁺ and Y₃Al₅O₁₂∶0.02Cr³⁺,0.10Yb³⁺ samples under 590 nm excitation

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