A cikin 60s na ƙarni na ƙarshe, ma'aikatan kimiyya da fasaha sun yi amfani da ka'idar semiconductor PN junction luminescence don haɓaka diodes masu fitar da hasken LED.LED ɗin da aka haɓaka a wancan lokacin yana amfani da GaASP, launinsa mai haske ja ne.Bayan kusan shekaru 30 na ci gaba, LED ɗin da kowa ya sani sosai ya sami damar fitar da fitilu ja, orange, rawaya, kore, shuɗi da sauran launuka masu launi.Koyaya, farar LED don haskakawa an haɓaka shi ne kawai bayan 2000, kuma an gabatar da mai karatu ga farin LED don haskakawa.Madogarar hasken hasken LED na farko da aka yi da ka'idar junction PN semiconductor ta fito a farkon 60s na karni na 20.
Kayan da aka yi amfani da shi a wancan lokacin shine GaAsP, wanda ya haskaka ja (λp = 650nm), kuma a cikin motsi na 20 mA, hasken haske ya kasance kawai 'yan dubbai na lumens, kuma daidaitaccen ingantaccen haske ya kasance kusan 0.1 lumens a kowace watts. .A cikin tsakiyar 70s, an gabatar da abubuwan In da N don yin LEDs suna samar da hasken kore (λp = 555nm), hasken rawaya (λp = 590nm) da hasken orange (λp = 610nm), kuma ingancin hasken ya kuma ƙara zuwa 1. lumen/watt.A farkon shekarun 80s, tushen hasken LED na GaAlAs ya bayyana, yana sa ingancin hasken LED ja ya kai lumens 10 a kowace watt.A farkon 90s, an sami nasarar ƙera sabbin kayayyaki guda biyu, GaAlInP, waɗanda ke fitar da haske ja da rawaya, da GaInN, mai fitar da haske kore da shuɗi, waɗanda suka inganta ingantaccen haske na LED.A cikin 2000, LED da aka yi da tsohon ya sami ingantaccen haske na 100 lumens / watt a cikin yankunan ja da orange (λp = 615nm), yayin da LED da aka yi daga karshen zai iya kaiwa 50 lumens / watt a cikin koren yanki (λp=). 530 nm).
Lokacin aikawa: Nov-11-2022