Upconversion spectral modulation of NaLaF4∶Er3+/Yb3+ at different excitation wavelengths
In order to investigate the laws and mechanisms of different excitation wavelengths(980 nm,1 550 nm)on the spectral modulation of NaLaF4∶Er3+/Yb3+ upconversion luminescent materials,we synthesized a series of NaLaF4 phosphors with different Er3+/Yb3+doping concentrations by a hydrothermal-solid phase two-step reaction method.The materials were tested by XRD and fluorescence spectrophotometer to analyze their luminescence performance and mechanism.The results indicate that the samples show green luminescence under the excitation of 980 nm,and the upconversion luminescence intensity increases and then decreases with the increase of Er3+/Yb3+ doping concentration,and the luminescence process is a two-photon process.Under excitation at 1 550 nm,the samples exhibite red luminescence.The intensity of upconversion luminescence increases with increasing Er3+doping concentration,but decreases with increasing Yb3+concentration.The luminescence process is a three-photon process.Therefore,by adjusting the excitation wavelength,the color-controllable green and red luminescence is achieved in the same-component NaLaF4∶Er3+/Yb3+ phosphor,which is of theoretical significance for the design of new spectral modulation and the exploration of new luminescent materials.
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