Ytterbium/thulium ion co-doped hexagonal sodium fluoride yttrium microcrystals with directional emission properties of red light

Abstract

The invention discloses an ytterbium / thulium-ion-codoped hexagonal-phase sodium yttrium fluoride microcrystal with red-light oriented emission performance. The crystal is synthesized in an alkaline environment by using sodium fluoride as a fluorine source. The synthesis method is simple and controllable, and has the advantages of mild reaction conditions and no need of modification as compared with the thermal decomposition process. The prepared ytterbium / thulium-ion-codoped hexagonal-phase sodium yttrium fluoride microcrystal has the advantages of favorable crystallinity, favorable dispersity, uniform size and high water solubility, and has unique light emission characteristics. When exciting light performs excitation downwards along the central position of any one corner or cambered side or the central shaft of a single microcrystal, or along the central shaft or an adjacent corner of any one of a plurality of microcrystals, red-light oriented emission can be implemented. By using such unique light emission characteristics, the material is applicable to laser devices, and can implement monochromatic-light oriented emission without band-limited filter plates. The material is also applicable to biological imaging, and can accurately control the position of the exciting light. The material can also be used as a wave guide modulator to be used in research and development of novel photoelectric devices.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a ytterbium / thulium ion co-doped hexagonal phase sodium fluoride yttrium micron crystal with red light directional emission performance. Background technique [0002] Trivalent rare earth ion-doped up-conversion fluorescent materials have attracted the attention of scientists worldwide due to their unique physical properties, especially in optics. Its unique electronic configuration and rich energy level structure endow it with sharp spectral lines. , rich emission bands, low background fluorescence and long fluorescence lifetime and many other advantages. With the development of science and technology, rare earth luminescent materials are widely used in many fields such as solar cells, solid-state lasers, biomedicine, 3D imaging and infrared anti-counterfeiting, which has set off a global research boom. At present, researchers have successfully prepare...

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Problems solved by technology

The preparation methods of these luminescent materials with different morphologies have severe reaction conditions, and more importantly, the experimental process is cumbersome, and the rare earth luminescent materials with the required morphologies cannot be synthesized in one step.

Compared with the hydrothermal synthesis method, it is a relatively simple, mild and fast method. For example, Gao Dangli et al. used ammonium fluoride as the fluorine source to synthesize β-NaYF by hydrothermal method. 4 :Yb 3+ / Er 3+ Rod-shaped microcrystals (Dangli Gao, Xiangyu Zhang, and Wei Gao, ACS Appl.MatTm.IntTmfaces, 2013, 5, 9732-9739), Zhang Hong et al. synthesized β-NaYF in a weak acid environment by hydrothermal method 4 :Yb 3+ / Er 3+ Hexagonal disc-shaped micro-crystals (Junwei Zhao, Yajuan Sun, Xianggui Kong, Lijin Tian, ​​Yu Wang, Langping Tu, Jialong Zhao, and Hong Zhang, J. Phys. Chem. B, 2008, 112, 15666-15672), these two Morphology of β-NaYF 4 :Yb 3+ / Er 3+ Both microcrystals have good fluorescence characteristics and can be used in sensing, solar cells, biological imaging and other fields, but these two microcrystals cannot achieve directional emission of monochromatic fluorescence, and the fluorescence emission image will not vary with the position of the excitation light. Therefore, its further application and development are greatly limited, such as: because it cannot realize the directional emission of monochromatic light, it limits its application in lasers, and in the application of biological imaging, it cannot Precisely control the position of excitation light

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