The Eu2+-concentration dependence of photoluminescence behaviors in β-SiAlON:Eu2+ green phosphors prepared by combustion synthesis
The Eu2+-concentration dependence of photoluminescence behaviors in β-SiAlON:Eu2+ green phosphors prepared by combustion synthesis
复制标题
DOI：
10.1016/j.ceramint.2016.07.197
复制
发表时间：
2016-11
影响因子：
5.2
通讯作者：
Yiyao Ge;Ying Chen;Siyuan Sun;Zhaobo Tian;Jie Zhang;Z. Xie
中科院分区：
文献类型：
--
作者：
Yiyao Ge;Ying Chen;Siyuan Sun;Zhaobo Tian;Jie Zhang;Z. Xie
采用高效燃烧合成法（CS）制备了不同Eu 2+浓度的β-SiAlON绿色荧光粉。合成的β-SiAlON：Eu 2+荧光粉具有相纯度高、粒径均匀（3-5 μm）、结晶形态好、发光性能优异等特点。在紫外光或蓝光激发下，在发射光谱中可获得中心在540 nm附近的宽绿色发射带。通过系统的研究发现，Eu ~（2+）掺杂浓度对合成的荧光粉的物相组成、微观结构和发光性能有很大的影响。随着Eu ~（2+）掺杂浓度的增加，激发/发射光谱的强度都有所提高。然而，过量的Eu ~（2+）离子的引入会降低发光性能，这可能是由于Eu ~（2+）的浓度猝灭效应和不同的晶粒形貌所致。此外，还观察到发射光谱随Eu ~（2+）浓度的增加而发生连续红移的现象，并合理地揭示了这一现象。
Eu-doped β-SiAlON green phosphors with different Eu2+-concentrations were prepared by a highly efficient combustion synthesis (CS) method. The as-synthesized β-SiAlON:Eu2+phosphors featured high phase purity, uniform particle size of 3–5 µm, well-crystalline morphology and outstanding luminescent behaviors. A broad green emission band centering at around 540 nm could be obtained in the emission spectra under excitation of UV or blue light. Based on the systematically investigation, the Eu2+-concentration had an intense impact on the phase composition, microstructure and photoluminescence properties of as-synthesized phosphors. The intensities of excitation/emission spectra were both improved with the Eu2+-concentration increased. However, the excessive introduction of Eu2+ions would inversely debase the photoluminescence behavior, possibly ascribed to the concentration-quenching effect of Eu2+and the distinct grain morphology. Moreover, a continuous red-shift phenomenon in emission spectra with the increase of Eu2+-concentration was observed and rationally uncovered.