Which mechanism causes reduced efficiency in organic LED when electron-hole recombination occurs on high-energy molecular orbitals?

💡 Explanation

When recombination occurs on high-energy orbitals, non-radiative decay dominates because the excess energy is dissipated as heat through phonon emission instead of light emission. Therefore, overall efficiency drops due to wasted energy, rather than quenching, trapping, or delamination which involve other physical phenomena.

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