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Optical characteristics of high-efficiency violet-blue, blue, and green light emissions in InxGa1−xN quantum well (QW) structures with graded In content are investigated. Appearance of additional higher energy peaks at 410, 429, and 459nm above the main peaks at 430, 463, and 509nm with an effective carrier transfer from the higher to main peak sides is characteristic of these structures with various In contents of x<0.2, 0.2 0.3, respectively. Robust carrier localization by uniform, small-size, and high-density phase segregation plays an important role in maintaining high efficiencies over a wide range of In contents in graded-In-content InGaN QW structures.
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Cho et al. (2007) studied this question.
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