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Tunable emission color and mixed valence state via the modified activator site in the AlN-doped Sr3SiO5:Eu phosphor

机译：通过Aln-Doped Sr3sio5中的改性活化剂部位可调谐发射颜色和混合价态：欧盟磷光体

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摘要

Commercially white LEDs have cool white light and a low color rendering index (CRI) due to the absence of red light emission. Considering the respective characteristic luminescence properties of Eu2+ and Eu3+ ions, the combination of the two activators into a single host compound shows promisingly technical feasibility to realize warm w-LEDs with a high CRI but it is still a challenge in practice. Here, we confirmed the mixed europium valence states in Sr(3)Si(1-x)AlxO(5-2x)N(x):Eu phosphors, synthesized by a solid-state reaction method under a H-2/N-2 atmosphere. The crystal structure was characterized by X-ray diffraction and found to crystallize in the Sr3SiO5 phase. The samples show broad excitation bands (250-400 nm) and tunable emission colors from yellow to red, and the CIE chromaticity coordinates of Sr2.97Si1-xAlxO5-2xNx:0.03Eu (x = 0, 0.03, 0.2) were (0.518, 0.474), (0.607, 0.385) and (0.630, 0.367), respectively. The modification of activator sites caused by Al3+-N3(-) replacing Si4+-O2- explained the coexistence of Eu2+/Eu3+ ions, which was demonstrated by Rietveld refinement, photoluminescence analysis and fluorescence lifetime studies. Furthermore, the obtained phosphors also possessed good thermal stabilities. These results suggest that the Sr3Si1-xAlxO5-2xNx:Eu phosphors show potential applications in w-LEDs.
机译：商业白光LED具有凉爽的白光和由于没有红色发光而具有低色渲染指数（CRI）。考虑到Eu2 +和Eu3 +离子的各自特征发光性质，两个激活剂到单个主体化合物中的组合显示了具有高CRI的温暖W-LED的承诺技术可行性，但实际上仍然是挑战。在这里，我们在SR（3）Si（1-X）Alxo（5-2X）N（X）：EU磷光体中证实了混合的铕价态，通过H-2 / N-下通过固态反应方法合成2氛围。晶体结构的特征在于X射线衍射，发现在SR3SiO5相中结晶。样品显示宽励磁带（250-400nm）和从黄色到红色的可调发射颜色，以及SR2.97SI1-XALXO5-2XNX：0.03EU（x = 0,0.03,0.2）的CIE色度坐标是（0.518， 0.474），（0.607,0.385）和（0.630,0.367）。由Al3 + -N3（ - ）替代Si4 + -O2引起的活化剂位点的修饰解释了Eu2 + / Eu3 +离子的共存，该+ / Eu3 +离子的共存，其通过Rietveld改进，光致发光分析和荧光寿命研究证明。此外，所获得的磷光体也具有良好的热稳定性。这些结果表明，SR3SI1-XALXO5-2XNX：EU磷光体在W-LED中显示出潜在的应用。

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  • 来源
    《RSC Advances》 |2016年第39期|共7页
  • 作者

    Li Wei; Wang Jin; Zhang Haoran; Liu Yingliang; Lei Bingfu; Zhuang Jianle; Cui Jianghu; Peng Mingying; Zhu Yue;

  • 作者单位

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

    S China Univ Technol Sch Mat Sci &

    Engn State Key Lab Luminescent Mat &

    Devices Guangzhou 510640 Guangdong Peoples R China;

    South China Agr Univ Coll Mat &

    Energy Guangdong Prov Engn Technol Res Ctr Opt Agr Guangzhou 510642 Guangdong Peoples R China;

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