Fig. 3. Wound recovery effect of OLED and LED light irradiation on the HDF cells. In comparison with the control group, wound recovery was induced via 6 J/cm² OLED or LED light irradiation on HDF cells (A and B). ^*p<0.05, ^***p<0.005, independent samples t-test. Scale bar: 200 µm. OLED, organic light-emitting diode; LED, light-emitting diode; HDF, human dermal fibroblast.