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Monochromatic LED lamps varieties and their development history
2012-12-19 15:29:33

 

The advent of LED light source of the earliest applications of semiconductor PN junction light-emitting principle made in the early 1960s. Was GaAsP, fat red (λp = 650nm), the drive current of 20 mA, the luminous flux as long as a few thousandths of lumens, luminous efficiency of about 0.1 lumens / watt. 

The mid-1970s, the introduction of elements of In and N, the LED produces green (λp = 555nm), yellow (λp = 590nm) and orange (λp = 610nm) light efficiency has improved to 1 lumen / watt. 
To the early 1980s, presents a GaAlAs LED light source, the red LED light efficiency reaches 10 lumens / watt. 

The early 1990s, the red, the yellow light GaAlInP and greenish blue GaInN two new development victory LED light effect has been significant progress. In 2000, the former is made of LED in red, orange (λp = 615nm) light efficiency reaches 100 lumens / watt, then who made the LED luminous efficiency can reach the green area (λp = 530nm) 50 lumens / watts. 



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