Assertion: led | /r/CapableOf | use gallium arsenide(gaas
Facets:
value: for several decades
type: TEMPORAL
Source sentences:
text: For several decades, light emitting diodes have used materials such as gallium arsenide(GaAs), gallium arsenide phosphide(GaAsP), or gallium phosphide(GaP), which make PN junctions more efficient at producing light.