压力刺激下微晶体 (Lu,Y)₃Al₅O₁₂:Ce³⁺ 石榴石荧光粉的合成与发光性能。
Pressure-Stimulated Synthesis and Luminescence Properties of Microcrystalline (Lu,Y)₃Al₅O₁₂:Ce³⁺ Garnet Phosphors.
机构信息
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences , Novosibirsk 630090, Russia.
Functional Electronics Laboratory, Tomsk State University , Tomsk 634050, Russia.
出版信息
ACS Appl Mater Interfaces. 2015 Dec 2;7(47):26235-43. doi: 10.1021/acsami.5b08411. Epub 2015 Nov 19.
The Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 phosphors were synthesized by solid state reaction at temperature 1623 K and pressure 1.5 × 10(7) Pa in (95% N2 + 5% H2) atmosphere. Under the conditions, the compounds crystallize in the form of isolated euhedral partly faceted microcrystals ∼19 μm in size. The crystal structures of the Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 garnets have been obtained by Rietveld analysis. The photoluminescence (PL) and X-ray excited luminescence (XL) spectra obtained at room temperature indicate broad asymmetric bands with maxima near 519 and 540 nm for Y2.99Ce0.01Al5O12 and Lu2.98Ce0.01Y0.01Al5O12, respectively. The light source was fabricated using the powder Lu2.98Ce0.01Y0.01Al5O12 phosphor and commercial blue-emitting n-UV LED chips (λ(ex) = 450 nm). It is found that the CIE chromaticity coordinates are (x = 0.388, y = 0.563) with the warm white light emission correlated color temperature (CCT) of 6400 K and good luminous efficiency of 110 lm/W.
采用 1623 K 高温固相反应法，在 1.5×10(7) Pa 压力下，于（95% N2+5% H2）气氛中合成了 Lu2.98Ce0.01Y0.01Al5O12 和 Y2.99Ce0.01Al5O12 荧光粉。在上述条件下，化合物结晶成孤立的等轴部分多面微晶体，尺寸约为 19 μm。通过 Rietveld 分析得到了 Lu2.98Ce0.01Y0.01Al5O12 和 Y2.99Ce0.01Al5O12 石榴石的晶体结构。在室温下获得的光致发光（PL）和 X 射线激发发光（XL）光谱表明，Y2.99Ce0.01Al5O12 和 Lu2.98Ce0.01Y0.01Al5O12 分别具有最大值位于 519nm 和 540nm 的宽不对称带。光源采用 Lu2.98Ce0.01Y0.01Al5O12 荧光粉和商用的蓝紫光 LED 芯片（λ(ex)=450nm）制备。结果发现，CIE 色度坐标为（x=0.388，y=0.563），相关色温（CCT）为 6400K，发光效率为 110lm/W。
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