Abstract: The Er3+/Yb3+ co-doped NaGd(WO4)2 powder were synthesized by the hydrothermal method. The effects of different complexing agents and hydrothermal temperature on morphology and structure of the samples were studied. The visible and near infrared emission spectra of the co-doped NaGd(WO4)2 powders with various Er3+ ion concentrations were measured. The spectroscopic results show intense green emission bands, weak red emission and near infrared emission bands for the co-doped samples located at 530 nm, 552 nm, 656 nm and 1 532 nm under 980 nm LD excitation, which correspond to the 2H11/2/4S3/2→4I15/2,4F9/2→4I15/2 and 4I13/2→4I15/2 level transition of Er3+, respectively. With the increase of Er3+ concentration, the intensities of the upconversion and near infrared emission show a trend of increasing first and then decreasing. The most intense excitation and emission peaks are centered at 378 nm and 552 nm. According to the relationship between exciting power and luminous intensity, the red light and green light all belong to two-photon absorption processes, but the red light also contains a certain single photon absorption component.
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2017, Vol. 31 
