A cikin 1960s, ma'aikatan kimiyya da fasaha sun haɓaka diodes masu fitar da hasken LED ta amfani da ka'idar semiconductor PN junction haske-emitting.Ledojin da aka samar a lokacin an yi shi da GaASP, kuma launinsa ja ne.Bayan kusan shekaru 30 na ci gaba, sanannun LED na iya fitar da ja, orange, rawaya, kore, shuɗi da sauran launuka.Koyaya, fararen LEDs don haskakawa an haɓaka su ne kawai bayan 2000. Anan, ana gabatar da masu karatu zuwa fararen LEDs don haskakawa.

bunkasa

Farkon tushen hasken LED wanda aka yi da ka'idar junction PN junction mai fitar da haske ya fito a farkon 1960s.Abubuwan da ake amfani da su a wancan lokacin shine GaAsP, wanda ke fitar da haske ja (λp=650nm).Lokacin da halin yanzu tuƙi ya kasance 20 mA, hasken haske shine kawai 'yan dubunnan lumens, kuma ingantaccen ingantaccen haske shine kusan 0.1 lumen/watt.

A cikin tsakiyar 1970s, 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 ingantaccen ingancin ya kuma ƙara zuwa 1. lumen/watt.

A farkon shekarun 1980, tushen hasken LED na GaAlAs ya bayyana, yana sa ingantaccen ingancin jajayen LED ya kai 10 lumens/watt.

A farkon shekarun 1990, an sami nasarar ƙera sabbin kayayyaki guda biyu, GaAlInP, masu fitar da haske mai launin ja da rawaya, da GaInN mai fitar da haske kore da shuɗi, waɗanda suka inganta ingantaccen hasken LED.

A cikin 2000, ingantaccen haske na LEDs da aka yi ta tsohon ya kai 100 lumens a kowace watt a cikin ja da ja da orange (λp = 615nm), yayin da ingantaccen tasirin LEDs da aka yi ta ƙarshen a cikin yankin kore (λp = 530nm) iya isa 50 lumen./watt.