發光二極體為特殊材質製成之p-n二極體。在順向偏壓下,電子在接合面流動時,會在再結合而消滅的過程中發光。體積小、發光效率原不高,但近年來發展迅速,適用場合已推廣到交通信號燈、指示燈,甚至也適用於一些特殊場合之照明用途。
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