Which mechanism limits the efficiency of organic LED (OLED) displays due to molecular excited states?

💡 Explanation

When multiple molecules in OLED material exist in excited triplet states, triplet-triplet annihilation occurs because the interaction of two triplets can produce one singlet and one ground state molecule, losing energy as heat thereby reducing light emission. Therefore, triplet-triplet annihilation limits efficiency, rather than diffusion, polaron formation, or singlet fission which affect different materials and exciton dynamics.

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