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首页> 外文期刊>RSC Advances >A novel single-phase white light emitting phosphor Ca9La(PO4)(5)(SiO4)F-2:Dy3+: synthesis, crystal structure and luminescence properties
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A novel single-phase white light emitting phosphor Ca9La(PO4)(5)(SiO4)F-2:Dy3+: synthesis, crystal structure and luminescence properties

机译：新型单相发白光荧光粉Ca9La（PO4）（5）（SiO4）F-2：Dy3 +：合成，晶体结构和发光性能

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摘要

A novel single-phase white light emitting phosphor Ca9La(PO4)(5)(SiO4)F-2:Dy3+ was prepared through traditional high-temperature solid state technology. The crystal structures of Ca9La(PO4)(5)(SiO4)F-2 with or without Dy3+ ions were refined by the Rietveld method. The diffuse reflection spectra, excitation spectra, emission spectra, and decay times were characterized to investigate the photoluminescence properties for application in white light-emitting diodes. The results showed that the Ca9La(PO4)(5)(SiO4)F-2:Dy3+ phosphor could efficiently assimilate n-UV light and emit blue (similar to 485 nm) and yellow light (similar to 580 nm), originating from the f-f transitions of Dy3+. The critical Dy3+ quenching concentration (QC) was determined to be about 15 mol%, and the corresponding QC mechanism was verified to be the dipole-dipole interaction. Additionally, the emission colors of all samples were located close to the ideal white light region, and the optimal chromaticity coordinates and correlated color temperature (CCT) were determined to be (x = 0.338, y = 0.336) and 5262 K. All the above results indicate that the as-prepared Ca9La(PO4)(5)(SiO4)F-2:Dy3+ phosphor could serve as a promising candidate for white-light n-UV-LEDs.
机译：通过传统的高温固态技术制备了一种新型的单相发白光荧光粉Ca9La（PO4）（5）（SiO4）F-2：Dy3 +。通过Rietveld方法精制含或不含Dy3 +离子的Ca9La（PO4）（5）（SiO4）F-2的晶体结构。表征了漫反射光谱，激发光谱，发射光谱和衰减时间，以研究用于白光发光二极管的光致发光特性。结果表明，Ca9La（PO4）（5）（SiO4）F-2：Dy3 +荧光粉可有效吸收n-UV光，并发出蓝光（约485 nm）和黄光（约580 nm），其起源于Dy3 +的ff过渡。临界的Dy3 +猝灭浓度（QC）被确定为约15 mol％，并且相应的QC机理被证明是偶极-偶极相互作用。此外，所有样品的发光颜色都位于理想的白光区域附近，并且最佳色度坐标和相关色温（CCT）确定为（x = 0.338，y = 0.336）和5262K。结果表明，制备的Ca9La（PO4）（5）（SiO4）F-2：Dy3 +荧光粉可作为有希望的白光n-UV-LED候选物。

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