Question

What is a difference between 'Efficiency DROP' and 'Efficiency DROOP' in LEDs.

Basically, I want to know the difference between DROP and DROOP word.

Please explain here in detail (don't try to use the Cambridge dictionary or Wikipedia dictionary, because I already explore that without any success)

Give the SOLID answer (difference) with solid reason.

Only detailed answer with solid reason will be considered as a PERFECT answer.

Answer 1

Efficiency Drop simply refer the reduction of efficiency in LEDs. There are lots of reasons behind the Efficiency Drop.

Efficiency Droop (a particular case of efficiency Drop) is a flaw in LED lightbulbs that causes efficiencies to drop by as much as 20% when the LEDs are subjected to greater electrical currents.

Explanation for how Efficiency Droop occur:

LEDs take advantage of the fact that high-energy electrons emit photons, i.e. particles of light, as they move from a higher to a lower energy level. The light-emitting diode is constructed of three sections: an “n-type” section of crystal that is loaded with negatively charged electrons; a p-type section of crystal that contains many positively charged “holes;” and a section in between the two called the “quantum well” or “active region.”

Electrons are injected into the active region from the n-type material as holes are injected into the active region from the p-type material. The electrons and holes move in opposite directions and, if they meet in the active region, they recombine, at which point the electron moves to a lower state of energy and emits a photon of light. Unfortunately, researchers have noticed that as more current is applied, LEDs lose efficiency, producing proportionally less light as the current is increased.

What the new research has shown is that, under the “high current regime,” an electric field develops inside the p-type region of the diode, which allows electrons to escape from the active region. As a result, these escaped electrons are unable to recombine with holes and emit photons of light — hence the decreased efficiency.

Difference between words DROOP & DROP:

Droop & Drop are synonyms but Drop is used in general cases, the DROOP is used as a special form for the drop (in efficiency of the LED) when we say Efficiency drop caused due to greater electrical currents. In physics usually we use some distinct word { like we use the words proton, neutron which are special types of nucleons(general term) } literally may be same with some other word, but it is only to be used for a specific case like DROOP is used for Drop due to higher electrical currents.