Abstract

A ${\mathrm{Tm}}^{3+}/{\mathrm{Yb}}^{3+}/{\mathrm{Bi}}^{3+}$ co-doped ${\mathrm{GdVO}}_4$ phosphor sample has been synthesized using a high-temperature solid-state reaction technique. The X-ray diffraction patterns reveal pure phase formation and crystalline behavior of the synthesized samples. Intense blue and NIR upconversion emissions have been observed upon excitation with a 980 nm diode laser. It is found that the addition of the ${\mathrm{Bi}}^{3+}$ ion to the phosphor reduces the intensity of blue emission and enhances the NIR emission intensity to the extent that NIR emission is nearly monochromatic [$(I_{\mathrm{NIR}}/I_{\mathrm{Blue}})\hspace{0.17em}\sim \hspace{0.17em}14$]. This ratio is further improved up to 70 times (almost monochromatic) by varying the pump power of the diode laser. Thus, this material can be used as a cheap source of monochromatic NIR emission at 800 nm for bioimaging.

© 2018 Optical Society of America

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