LED yeelenbɔyɔrɔ fɔlɔ, min be baara kɛ ni yeelen-bɔli sariya ye min be sɔrɔ semi-konduktɛri P-N ɲɔgɔndan na, o dilanna saan 1960 daminɛ na. O wagati la, u tun be baara kɛ ni fɛɛn min ye, o tun ye GaAsP ye, a tun be yeelen wuleman bɔ (λp=650nm). Ni bolifɛn kuran ye 20 mA ye, yeelen min be bɔ, o tun be yeelen bɔyɔrɔ waa damadɔ dɔrɔn lo bɔ, o min b’a to yeelen be bɔ ka se 0,1 lumen/watt ɲɔgɔn ma.
San 1970 cɛmancɛ la, In ni N fɛnw donni y’a to LEDw be se ka yeelen binkɛnɛman (λp=555nm), nɛrɛmuguman (λp=590nm), ani nɛrɛmuguman (λp=610nm) bɔ, ani yeelenko fanga yɛlɛmana ka se 1 lumen/watt ma.
San 1980 daminɛ na, GaAlAs LED yeelenbɔyɔrɔw bɔra, o min y’a to LED wulemanw be se ka yeelenbɔlan 10 lumens/watt sɔrɔ.
San 1990 daminɛ na, minɛn kura fila -GaAlInP (min be yeelen wuleman ni nɛrɛmuguman bɔ) ani GaInN (min be yeelen binkɛnɛman ni nɛrɛmuguman bɔ)-w dilanni ka ɲɛ, o ye LEDw ka yeelenbɔcogo fisaya kosɛbɛ. Saan 2000, fɔlɔw ye LEDw dilan minw ka yeelen be se lumen 100 ma watt kelen na yɔrɔ wulemanw ni yɔrɔ wulemanw na (λp=615nm), filananw ye LEDw dilan minw ka yeelen be se lumen 50 ma watt kelen na yɔrɔ binkɛnɛmanw na (λp=530n).
