Which mechanism causes reduced LED efficiency if gallium nitride contains dislocations?

💡 Explanation

Non-radiative electron-hole recombination due to the Shockley-Read-Hall mechanism causes a loss of energy as heat rather than light because dislocations introduce energy states within the band gap; therefore the LED weakens rather than emits brightly under sustained high current or other defects activate instead.

• Which consequence results when excessive hydrogen accumulates within metal's grain boundaries?
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• Which outcome occurs when a closed cryogenic tank containing liquid helium experiences rapid depressurization?