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首页> 外文期刊>RSC Advances >Luminescence properties and its red shift of blue-emitting phosphor Na3YSi3O9:Ce3+ for UV LED
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Luminescence properties and its red shift of blue-emitting phosphor Na3YSi3O9:Ce3+ for UV LED

机译：发射蓝光的荧光粉Na 3 YSi 3 O 9 ：Ce 3 + 的发光特性及其红移紫外线LED

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A series of Na3YSi3O9:Ce3+ phosphors have been synthesized via a conventional high temperature solid-state reaction. Each crystal structure was characterized by X-ray diffraction (XRD) and refined by the Rietveld method. Luminescence properties of Na3YSi3O9:Ce3+ phosphors such as emission red shifts, fluorescence decay curves, thermal stability, and CIE values were systematically investigated. Upon 300 nm excitation, the emission peaks of Na3YSi3O9:Ce3+ phosphors red shift from 385 nm to 415 nm with Ce3+ concentration increasing from 0.002 to 0.11. Moreover, this red-shift phenomenon also occurs with an excitation wavelength from 270 nm to 340 nm as the Ce3+ concentration determined, which has been explained using the centroid shift and crystal field splitting. The quenching concentration of Ce3+ in the host Na3YSi3O9 is determined to be about 3 mol% and the critical distance is calculated to be about 16.623 ?. The energy dispersion mechanism between Ce3+ ions was verified to be a dipole–dipole interaction. Temperature-dependent luminescence of Na3YSi3O9:0.03Ce3+ from 25 °C to 250 °C was evaluated, and the corresponding activation energy ΔE is 0.277 eV. Not only crystal field splitting but also centroid shift plays an important role in the red-shift of the Na3YSi3O9:Ce3+ phosphors, which may contribute to future research in designing novel solid phosphors by modifying composition of the host lattice to affect crystal field splitting and centroid shift, and then adjusting emission wavelengths to match the purposed application.
机译：一系列Na 3 YSi 3 O 9 ：Ce 3 + 荧光粉通过常规的高温固态反应合成。每个晶体结构都通过X射线衍射（XRD）表征，并通过Rietveld方法精制。 Na 3 YSi 3 O 9 ：Ce 3 + 荧光粉，例如发射红移，荧光衰减曲线，热稳定性和CIE值。在300 nm激发下，Na 3 YSi 3 O 9 <的发射峰/ sub> ：Ce 3 + 荧光粉在Ce 3 + 的作用下红变从385 nm变为415 nm。小浓度从0.002增加到0.11。此外，在确定Ce 3 + 浓度时，在270 nm至340 nm的激发波长处也会发生这种红移现象，这已使用质心位移和晶体场分裂。 Na 3 Ysmall 3 中Ce 3 + 的猝灭浓度确定sub> O 9 约为3 mol％，计算出的临界距离约为16.623？。证明Ce 3 + 离子之间的能量分散机制是偶极-偶极相互作用。 Na 3 YSi 3 O 9 < /small>:0.03Ce3 + 在25°C至250°C的条件下进行评估，相应的活化能Δ E 为0.277 eV 。 Na 3 Ysi 3 的红移中，不仅晶体场分裂而且质心移位都起着重要作用。 small> O 9 ：Ce 3 + 荧光粉，这可能有助于将来通过以下方法设计新型固体荧光粉的研究修改主晶格的组成以影响晶体场分裂和质心偏移，然后调整发射波长以匹配目标应用。

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