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首页> 外文期刊>RSC Advances >Tunable emission color and mixed valence state via the modified activator site in the AlN-doped Sr3SiO5:Eu phosphor
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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 Eu ~(2+) and Eu ~(3+) 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 ) Al _( x ) O _(5?2 x ) 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 Sr _(3) SiO _(5) phase. The samples show broad excitation bands (250–400 nm) and tunable emission colors from yellow to red, and the CIE chromaticity coordinates of Sr _(2.97) Si _(1? x ) Al _( x ) O _(5?2 x ) N _( x ) :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 Al ~(3+) –N ~(3?) replacing Si ~(4+) –O ~(2?) explained the coexistence of Eu ~(2+) /Eu ~(3+) 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 Sr _(3) Si _(1? x ) Al _( x ) O _(5?2 x ) N _( x ) :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Eu〜（2+）和Eu〜（3+）离子的各自特征发光性质，两种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，但它是在实践中仍然是一项挑战。在这里，我们在SR _（3）Si _（1≤x）Al _（x）O _（5≤2x）n _（x）：eu磷光体中，通过固态合成，确认了混合的铕价态在H _（2）/ N _（2）气氛下的反应方法。晶体结构的特征在于X射线衍射，发现在Sr _（3）SiO _（5）相中结晶。样品显示广泛的激发带（250-400nm）和从黄色到红色的可调发射颜色，以及Sr _（2.97）Si _（1≤x）Al _（x）O _（5≤2）的CIE色度坐标X）N _（X）：0.03EU（X = 0,0.03,0.2）（0.518,0.474），（0.607,0.385）和（0.630,0.367）。由Al〜（3+）-N〜（3？）替换Si〜（4+）-O〜（2？）引起的活化剂位点的修饰解释了Eu〜（2+）/欧盟〜（3+ ）离子，由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，SR _（3）Si _（1？x）α_（x）o _（5？2 x）n _（x）：欧盟磷光体在W-LED中显示出潜在的应用。

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