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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Up-conversion monodispersed spheres of NaYF4: Yb3+/Er3+: green and red emission tailoring mediated by heating temperature, and greatly enhanced luminescence by Mn2+doping
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Up-conversion monodispersed spheres of NaYF4: Yb3+/Er3+: green and red emission tailoring mediated by heating temperature, and greatly enhanced luminescence by Mn2+doping

机译：NayF4的上转换单分散球体：YB3 + / ER3 +：通过加热温度介导的绿色和红色排放剪裁，并通过MN2 +掺杂大大增强发光

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摘要

Submicron sized, monodispersed spheres of Mn2+, Yb3+/Er3+ and Mn2+/Yb3+/Er3+ doped -NaYF4 were easily autoclaved from mixed solutions of the component nitrates and ammonium fluoride (NH4F), in the presence of EDTA-2Na. Detailed characterizations of the resultant phosphors were obtained using XRD, Raman spectroscopy, FE-SEM, HR-TEM, STEM, PLE/PL spectroscopy, and fluorescence decay analysis. Finer structure and better crystal perfection was observed at a higher calcination temperature, and the spherical shape and excellent dispersion of the original particles was retained at temperatures up to 600 degrees C. Under the 980 nm infrared excitation, the Yb3+/Er3+-doped sample (calcined at 400 degrees C) exhibits a stronger green emission centered at approximate to 524 nm (H-2(11/2) I-4(15/2) transition of Er3+) and a weaker red emission centered at approximate to 657 nm (F-4(9/2) I-4(15/2) transition of Er3+). A 200 degrees C increase in the temperature from 400 degrees C to 600 degrees C resulted in the dominant red emission originating from the F-4(9/2) I-4(15/2) transition of Er3+, instead of the previously dominant green one. Mn2+ doping induced a remarkable more enhanced intensity at approximate to 657 nm and approximate to 667 nm (red emission area) than that at approximate to 524 nm and approximate to 546 nm (green emission area), because of the non-radiative energy transfer between Mn2+ and Er3+. However, a poor thermal stability was induced by Mn2+ doping. The observed upconversion luminescence of the samples calcined at 400 degrees C and 600 degrees C followed the two photon process and the four photon process, respectively.
机译：在EDTA-2NA存在下，亚微米尺寸的Mn2 +，Yb3 + / Er3 +和Mn2 + / Yb3 + / Er3 +掺杂-NayF4容易从组分硝酸盐和氟化铵（NH 4 F）的混合溶液中易于侵蚀。使用XRD，拉曼光谱，Fe-SEM，HR-TEM，茎，PLE / PLE光谱和荧光衰变分析获得所得磷光体的详细表征。在较高的煅烧温度下观察到更好的结构和更好的晶体完美，并且在高达600℃的温度下保持原始颗粒的球形和优异的分散体。在980nm红外激发下，Yb3 + / Er3 +掺杂的样品（在400摄氏度下煅烧）表现出以524nm（H-2（11/2）I-4（15/2）的ER3 +）的524nm（H-2（11/2）I-4（15/2）转变为中心的更强的绿色发射，并且在约657nm的近似时较弱的红色排放量（ F-4（9/2）I-4（15/2）ER3 +的转换。从400摄氏度到600摄氏度的温度增加200摄氏度导致源自来自ER3 +的F-4（9/2）I-4（15/2）转变的主导红色发射，而不是先前的主导绿色。 Mn2 +掺杂诱导近似为657nm的显着增强强度，并且近似到667nm（红色发光区域），而不是近似为524nm，并且近似于546nm（绿色发射区域），因为之间的非辐射能量转移MN2 +和ER3 +。然而，通过Mn2 +掺杂诱导了差的热稳定性。观察到在400摄氏度和600摄氏度下煅烧的样品的上变化发光，然后分别为两个光子处理和四个光子处理。

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    Zhu Qi; Song Caiyun; Li Xiaodong; Sun Xudong; Li Ji-Guang;

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    Northeastern Univ Key Lab Anisotropy &

    Texture Mat Minist Educ Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Key Lab Anisotropy &

    Texture Mat Minist Educ Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Key Lab Anisotropy &

    Texture Mat Minist Educ Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Key Lab Anisotropy &

    Texture Mat Minist Educ Shenyang 110819 Liaoning Peoples R China;

    Natl Inst Mat Sci Res Ctr Funct Mat Namiki 1-1 Tsukuba Ibaraki 3050044 Japan;

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  • 中图分类 化学;无机化学;
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