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首页> 外文期刊>Crystal growth & design >NaYF4 : Eu2+ microcrystals: Synthesis and intense blue luminescence
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NaYF4 : Eu2+ microcrystals: Synthesis and intense blue luminescence

机译：NaYF4：Eu2 +微晶：合成和强烈的蓝色发光

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In this work, NaYF4:Eu2+ microcrystals with an intense blue luminescence were successfully fabricated via a solution-based route. During the sample preparation, oleic acid and cetyltrimethylammonuim bromide were used as the surfactants to tune the morphology, while citric acid was taken as a ligand to stabilize the beta-phase NaYF4 and to completely reduce Eu3+ to Eu2+ for activation of blue luminescence. As confirmed by transmission electron microscopy and scanning electron microscopy measurements, all as-prepared samples crystallized in hexagonal rods or tubes, depending on the types of surfactants used. The rod samples had a diameter of about 1.7 mu m and a length in the range of 2.6-3 mu m, while the tube samples showed an external diameter in the range of 0.8-1 mu m and a length in the range of 2.5-3.5 mu m with an internal diameter of about 0.5 mu m. Both rods and tubes were capped with surfactants, which enabled them to stably disperse in glycol to form transparent solutions. This work seems to be the first example of the successful preparation of stable dispersion of micron luminescence solids. These transparent solutions showed an intense blue luminescent emission of Eu2+ with a quantum yield of about 14%. Finally, the mechanism for the fabrication of the rods and tubes as well as the Eu3+ reduction was discussed.
机译：在这项工作中，通过基于溶液的途径成功地制备了具有强烈蓝色发光的NaYF4：Eu2 +微晶体。在样品制备过程中，油酸和十六烷基三甲基溴化铵被用作表面活性剂以调节形态，而柠檬酸被用作配体以稳定β相NaYF4并将Eu3 +完全还原为Eu2 +以激活蓝色发光。如通过透射电子显微镜和扫描电子显微镜测量所证实的，取决于所使用的表面活性剂的类型，所有制备的样品在六边形棒或管中结晶。棒状样品的直径约为1.7μm，长度在2.6-3μm范围内，而试管样品的外径在0.8-1μm范围内，长度在2.5-μm范围内。 3.5微米，内径约0.5微米。棒和管都用表面活性剂覆盖，这使它们能够稳定地分散在乙二醇中以形成透明溶液。这项工作似乎是成功制备微米发光固体稳定分散体的第一个例子。这些透明溶液显示出Eu2 +的强烈蓝色发光，量子产率约为14％。最后，讨论了杆和管的制造机理以及Eu3 +还原的机理。

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