Which mechanism limits the performance of organic light-emitting diodes (OLEDs) at high current densities?

💡 Explanation

Under high current densities in OLEDs, triplet-triplet annihilation occurs because the high concentration of triplet excitons increases the likelihood of energy transfer and non-radiative decay, thus reducing efficiency. Therefore triplet-triplet annihilation limits performance, rather than electrode oxidation, exciton diffusion or polaron scattering which become dominant under other conditions.

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