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Yb:NaGd(WO
4
)
2
single crystals are implanted with 6.0 MeV O ions at room temperature. The effects of ion irradiation on the structure and spectral properties are demonstrated by employing X-ray diffraction techniques, high resolution X-ray diffraction techniques and photoluminescence (PL) measurement. The corresponding results show that the sample can retain good crystallinity by irradiation at relative low fluences of 1.6 × 10
14
ions/cm
2
, whilst both the PL intensity and the line bandwidth can be effectively improved.