GaN-based light emitting diodes(LEDs) with different In contents in the wells were fabricated.The blue-shift of the LED which comes from the quantum confinement Stark effect(QCSE) is observed when the driving current rangfes from 3 mA to 900 mA.And the blue-shift of the green LED is greater than that of the blue LED as the injection current varies,because the greater In contents in quantum well of green LED determines obvious quantum confinement Stark effect.The luminous efficiency is seriously ...