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首页> 美国卫生研究院文献>Science and Technology of Advanced Materials >On the origin of fine structure in the photoluminescence spectra of the β-sialon:Eu2+ green phosphor
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On the origin of fine structure in the photoluminescence spectra of the β-sialon:Eu2+ green phosphor

机译：β-sialon：Eu2 +绿色荧光粉的光致发光光谱中精细结构的起源

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摘要

The photoluminescence (PL) and PL excitation (PLE) spectra of Si6−zAlzOzN8−z (β-sialon):Eu2+ phosphors with small z values (z=0.025–0.24) were studied at room temperature and 6 K. The PL and PLE spectra exhibit fine structure with the PL lines being as sharp as 45–55 nm even at room temperature; this fine structure was enhanced by decreasing the z value. These results can be used for expanding the color gamut of liquid crystal displays, particularly in the blue–green region. From low-temperature measurements, the fine PLE structure was ascribed to discrete energy levels of 7FJ states. The 4f65d excited states of Eu2+ are considered to be localized near the 4f orbital. This is because the bonding of Eu2+ with surrounding atoms is ionic rather than covalent. Lattice phonon absorptions were also observed in the PLE spectrum, revealing that the optically active Eu2+ ions are located in the β-sialon crystal. The PL spectrum of the sample with the smallest z value (0.025) consists of a sharp zero-phonon line and lattice phonon replicas, which results in a sharp and asymmetric spectral shape.
机译：在室温下研究了具有较小z值（z = 0.025-0.24）的Si6-zAlzOzN8-z（β-sialon）：Eu 2 + 荧光粉的光致发光（PL）和PL激发（PLE）光谱温度和6K。PL和PLE光谱显示出良好的结构，即使在室温下，PL线也清晰如45-55 nm。通过降低z值可以增强这种精细的结构。这些结果可用于扩展液晶显示器的色域，尤其是在蓝绿色区域中。从低温测量结果来看，精细的PLE结构归因于 7 FJ状态的离散能级。 Eu 2 + 的4f 6 5d激发态被认为位于4f轨道附近。这是因为Eu 2 + 与周围原子的键是离子性的而不是共价的。在PLE光谱中也观察到晶格声子吸收，表明旋光性的Eu 2 + 离子位于β-赛隆晶体中。 z值最小（0.025）的样品的PL光谱由尖锐的零声子线和晶格声子副本组成，这导致了尖锐且不对称的光谱形状。

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