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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Ca6La4(SiO4)(2)(PO4)(4)O-2:Eu2+: a novel apatite green-emitting phosphor for near-ultraviolet excited w-LEDs
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Ca6La4(SiO4)(2)(PO4)(4)O-2:Eu2+: a novel apatite green-emitting phosphor for near-ultraviolet excited w-LEDs

机译：Ca6La4（SiO4）（2）（PO4）（4）O-2：Eu2 +：一种用于近紫外激发w-LED的新型磷灰石绿色荧光粉

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摘要

A novel apatite phosphor Ca6La4(SiO4)(2)(PO4)(4)O-2:Eu2+ was prepared by conventional high-temperature solid-state reaction. Phase purity was examined by XRD and XPS analysis. The crystal structure information, such as space group, cell parameters and atomic coordinates, were refined by the Rietveld method, revealing that Eu2+ occupied the sites of Ca2+ ions. Moreover, low-temperature experiments, including low-temperature PL spectra and low-temperature decay curve, were used to prove the existence of two luminescence centers in Ca6La4(SiO4)(2)(PO4)(4)O-2:Eu2+. With the increase in doping concentration of Eu2+, the emission wavelength shows a red shift from 498 nm to 510 nm, which is mainly caused by the increase in crystal-field splitting by Eu2+. The optimized concentration of Eu2+ was confirmed to be 0.01, the R-c was calculated to be 20.09 angstrom and the energy transfer between Eu2+ was demonstrated to be by exchange interaction. Moreover, good thermal stability has been proved by a temperature-dependence experiment; it shows that the phosphor can maintain 55% of emitting intensity at 150 degrees C compared to that at room temperature. Finally, the Ca6La4(SiO4)(2)(PO4)(4)O-2:Eu2+ phosphor was fabricated with commercial red (CaAlSiN3:Eu2+) and blue (BAM:Eu2+) phosphor coating on a n-UV chip. This proves that this green phosphor has the potential to be used in a w-LED lamp.
机译：通过常规高温固相反应制备了新型磷灰石荧光粉Ca6La4（SiO4）（2）（PO4）（4）O-2：Eu2 +。通过XRD和XPS分析检查相纯度。通过Rietveld方法对晶体结构信息（如空间群，晶胞参数和原子坐标）进行了精炼，发现Eu2 +占据了Ca2 +离子的位置。此外，通过低温实验，包括低温PL光谱和低温衰减曲线，来证明Ca6La4（SiO4）（2）（PO4）（4）O-2：Eu2 +中存在两个发光中心。随着Eu2 +掺杂浓度的增加，发射波长从498 nm到510 nm出现红移，这主要是由于Eu2 +引起的晶体场分裂增加所致。确认Eu2 +的最佳浓度为0.01，R-c计算为20.09埃，并且通过交换相互作用证明Eu2 +之间的能量转移。此外，通过温度依赖性实验证明了良好的热稳定性。结果表明，与室温下的荧光粉相比，荧光粉在150摄氏度下可以保持55％的发光强度。最后，用商用红色（CaAlSiN3：Eu2 +）和蓝色（BAM：Eu2 +）荧光粉涂层在n-UV芯片上制备了Ca6La4（SiO4）（2）（PO4）（4）O-2：Eu2 +荧光粉。这证明了这种绿色荧光粉具有在w-LED灯中使用的潜力。

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