Assertion: led's emitter | /r/HasProperty | based on gaasp
Facets:
Source sentences:
text: In 1962, the group of Holonyak in the United States announced red LED emitters based on GaAsP (Holonyak and Bevacqua, 1962).The efficacy (intensity of light output per input electric power) was at the time only of the order 0.1