Asalin A cikin shekarun 1960, masana kimiyya sun haɓaka LED bisa ka'idar haɗin gwiwar PN semiconductor. Ledojin da aka samar a wancan lokacin an yi shi da GaASP kuma launinsa mai haske ja ne. Bayan kusan shekaru 30 na haɓakawa, mun saba da LED, wanda zai iya fitar da ja, orange, rawaya, kore, shuɗi ...
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