Abstract
Y 2(MoO 4) 3:Er 3+/Yb 3+ phosphors with fixed (varied) Er 3+ and varied (fixed) Yb 3+ concentrations were synthesized by a conventional solid-state reaction. The crystal structure of the phosphors was characterized by means of X-ray diffraction (XRD). Upon 980 nm excitation, very weak blue emission, and strong green and red upconversion emissions centered at 485, 525, 545 and 656 nm were observed. The two-photon process was confirmed to be responsible for both the green and red upconversion emissions. The effects of green upconversion emission intensity ratio ( 2H 11/2→ 4I 15/2 versus 4S 3/2→ 4I 15/2) and the integrated upconversion emission intensity on the Yb 3+ and Er 3+ concentrations were studied.
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