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By cadmium allowing of zinc oxide, a phosphor-free single-chip white light emission diode based on n-ZnCdO/p-GaN heterostructure has been realized. The white light electroluminescence was produced by the superposition of two intense emission bands, a blue band and a yellow band. The origins of the blue band was contributed by both GaN and ZnCdO, while the yellow band was from the recombination of...
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