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Published in:
21-04-2021
Exporing upconversion luminescence properties of Yb3+/Er3+ Co-doped SrWO4 phosphors: microstructural, morphological and mechanisms
Published in: Journal of Materials Science: Materials in Electronics | Issue 9/2021
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Abstract
SrWO4:Yb3+/Er3+ upconversion luminescent materials with different Yb3+/Er3+ doping concentrations were prepared by high temperature solid-sate reaction at 1200 °C for 4 h. X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrometer (PL) were used to characterize the phase structure, surface morphology and luminescent properties of the samples. The sample that contains 7% Yb3+ and 2.5% Er3+ shows the best luminescence performance. Under 980 nm excitation light environment, the emission peak of the SrWO4:(0.07)Yb3+/(0.025)Er3+ sample locates at the orange-red area (650–700 nm), and the color coordinate is (0.5846, 0.4053). In the Yb3+/Er3+ co-doped SrWO4 phosphor, the 980 nm laser photons are strongly absorbed by the Yb3+ ions and transferred to the ground state Er3+ ions via energy transfer process. The present results demonstrate that the SrWO4:Yb3+/Er3+ phosphors may be a promising candidate for upconversion white light-emitting diodes (WLEDs).