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A series of Er3+/Yb3+ co‐doped Cs3GdGe3O9 (CGG) phosphors were prepared by solid‐phase sintering method, and the microstructure and upconversion luminescence (UCL) properties were tested by variable‐temperature X‐ray diffractometry and variable‐temperature spectrometer. Abnormal UCL phenomena were found, which include UCL intensity continuously increasing under 980 nm laser continuous irradiation...
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