The influence of polarization effect on the luminescence characteristics of InGaN-based LEDs was researched by the experimental means of electroluminescence.It is found that the peak position of the InGaN-based LED has a blue shift before a red shift with the increase of the injection current,while the peak position of the AlGaInP-based red LED only has a red shift.The peak positions of the blue and green LEDs are blue-shifted by 3 nm and 8 nm,respectively.By further study,it is found that the external quan...