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Effect of Mg~(2+) and Ti~(IV) doping on the luminescence of Y_2O_2S:Eu~(3+)

机译:Mg〜(2+)和Ti〜(IV)掺杂对Y_2O_2S:Eu〜(3+)发光的影响

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摘要

The Y_2O_2S:Eu~(3+),Mg~(2+),Ti~(IV) (x_(Eu) = 0.028, x_(Mg) = 0.086, x_(Ti) = 0.03) materials were prepared with the flux fusion method. According to X-ray powder diffraction, the materials had the hexagonal crystal structure. The emission of Y_2O_2S:Eu~(3+),Mg~(2+),Ti~(IV) was centered at 627 nm (λ_(exc): 250 nm) due to the ~5D_0→ ~7F_2 transition of Eu~(3+). The excitation spectra (λ_(em) : 627 nm) showed broad bands at 240 and 320 nm due to the O~(2-) → Eu~(3+) and S~(2-)→ Eu~(3+) charge transfer transitions, respectively. The latter band can also overlap with the Ti → Eu~(3+) energy transfer. In the excitation spectra with synchrotron radiation, in addition to the O~2 → Eu~(3+) and S~(2-) → Eu~(3+) charge transfer transitions, excitation over the band gap was observed at 4.8 eV (258 nm). The red persistent luminescence due to the ~5D_0→ ~7F_2 emission from Eu~(3+) residing in the regular Y~(3+) site of the host was ca. 10 min with 1 min fluorescent lamp irradiation. In addition, a very broad band was observed at 600 nm probably due to the Ti~(3+) emission.
机译:用助焊剂制备了Y_2O_2S:Eu〜(3 +),Mg〜(2 +),Ti〜(IV)(x_(Eu)= 0.028,x_(Mg)= 0.086,x_(Ti)= 0.03)材料融合方法。根据X射线粉末衍射,该材料具有六方晶体结构。由于Eu〜5D_0→〜7F_2跃迁,Y_2O_2S:Eu〜(3 +),Mg〜(2 +),Ti〜(IV)的发射集中在627 nm(λ_(exc):250 nm)。 (3+)。由于O〜(2-)→Eu〜(3+)和S〜(2-)→Eu〜(3+),激发光谱(λ_(em):627 nm)在240和320 nm处显示出宽带。分别转移电荷。后面的带也可以与Ti→Eu〜(3+)能量转移重叠。在同步加速器辐射的激发光谱中,除了O〜2→Eu〜(3+)和S〜(2-)→Eu〜(3+)电荷转移跃迁之外,在4.8 eV处还观察到了带隙激发(258 nm)。由于驻留在宿主规则Y〜(3+)位的Eu〜(3+)发出〜5D_0→〜7F_2发出的红色持续发光大约为。 1分钟荧光灯照射10分钟。另外,在600nm处观察到非常宽的带,这可能是由于Ti〜(3+)发射。

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