Visible IR-to-green photon-avalanche upconversion is reported in an singly doped crystal under excitation. Upconverted green, red, and IR emissions are observed at 540, 645, and , respectively. Temporal evolution and excitation power dependent upconversion intensity are measured, suggesting that a photon-avalanche mechanism is responsible for the upconversion process. It is believed that an efficient cross relaxation mainly performs the population of excited state, resulting in the intense photon-avalanche upconversion emission in the synthesized samples.
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