Synthesis and characterization of NaSrBO₃ : Ce, Yb phosphor is described. NaSrBO₃ : Ce phosphor exhibited characteristic Ce³⁺ emission around 414 nm. Co-doping with Yb³⁺ resulted in near-infrared (NIR) emission around 981 nm. This is attributed to phonon-assisted cooperative energy transfer from Ce³⁺ to two Yb³⁺ ions. Ce³⁺ -> Yb³⁺ energy transfer is proved using a variety of measurements such as dependence of photoluminescence intensity of visible and NIR emissions on Yb³⁺ concentration, excitation spectrum for Yb³⁺, accelerated decay of Ce³⁺ emission after Yb³⁺ codoping, etc. Using lifetime measurements, the efficiency of Ce³⁺ -> Yb³⁺ energy transfer is estimated to be 48.65%. Keywords: near-infrared, photoluminescence, Ce³⁺ -> Yb³⁺ energy transfer, borate.

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