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Contextual Info: TOSHIBA 5. [3 ] Explanations LED Light Emission Principles and Materials 5.1 T h e Principals o f LED L ig h t E m issio n LED lig h t is em itted by electrolum inescence. T his has a h igher em ission efficiency th an other m ethods of lig h t em ission such as photo-lum inescence, cathode lum inescence and