Study of the mechanism of luminescence enhancement in GaN-based semiconductors by water vapor plasma treatment and its application to light emitting devices

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In the present study, we have investigated how to enhance the efficiency of blue emission from GaN-based semiconductors, which make the base of white light emission, through an materials approach to aim the application to the highly efficient white-light emitting diodes for lighting. We have attained 10 to 20 times enhancement of blue emission by optimizing the conditions of plasma treatments using various gas species(water vapor, hydrogen, oxygen). We have found that this enhancement is due to the effects of atomic hydrogen, and have presented a new technical trend to develop highly efficient white-light emitting diodes. The present results may contribute to the carbon reduction and preservation of ecological environment of the earth.