A β‑nayf with red-light directional emission properties 4 :yb 3+ /er 3+ micro crystal

Abstract

The invention discloses a beta-NaYF4:Yb<3+> / Er<3+> micron crystal with red light directional emission performance. The crystal is synthesized in an alkaline environment by adopting sodium fluoride as a fluorine source, the synthetic method is simple and controllable, the reaction condition is mild and does not need modification in comparison with a pyrolytic process, and the prepared beta-NaYF4:Yb<3+> / Er<3+> micron crystal is good in crystallinity and dispersity, uniform in size and easy to be dissolved in water, and has a peculiar light emission characteristic: when exciting light is excited from top to bottom along any corner, or a middle position of an arc-shaped edge or the central axis of a single micron crystal, and the central axis or an adjacent corner of any crystal in multiple micron crystals, directional emission of red light can be realized; and the type of peculiar light emission characteristic ensures that the light emitting material can be applied to a laser, and the directional emission of monochromatic light can be realized without a wave limiting filter; the light emitting material also can be applied to biological imaging and has the advantage of accurately controlling the position of the exciting light; and the light emitting material also can be used as a waveguide modulator applied to research and development of a novel photoelectric device.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, in particular to a β-NaYF with red light directional emission performance 4 :Yb 3+ / Er 3+ micron crystals. 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 prepared rare earth luminescent materials with various shapes, ...

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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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