Assertion: led's lifetime | /r/HasProperty | long
Facets:
Source sentences:
text: In an indirect semiconductor, the match between conduction band energy valleys and holes that would allow momentum conservation is not favorable, most of the transitions are forbidden, and the resulting radiative lifetime is long.
text: In OLEDs using fluorescent organic molecules only, the decay of triplet excitons is quantum mechanically forbidden by selection rules, meaning that the lifetime of triplet excitons is long and phosphorescence is not readily observed.
text: Visible LEDs are growing in popularity and use thanks to their long lifetimes and miniature size.