OLED-based displays are now ubiquitous, and yet the very way positive and negative charges interact with each other to generate excitons and the overall fate of these species in the process of light emission still holds several mysteries. By investigating the operation of OLEDs containing protonated or deuterated organic semiconductors at low temperatures and moderate magnetic fields, the authors reveal here a nonmonotonic dependence of OLED light intensity on magnetic field, which is magnetoelectroluminescence. This enables distinction of interactions between carriers and molecular excitations.
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Braun et al. (2024) studied this question.
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