Fig. 1: Proposed energy-relaying mechanism. | Nature Communications

Fig. 1: Proposed energy-relaying mechanism.

From: Ladder-like energy-relaying exciplex enables 100% internal quantum efficiency of white TADF-based diodes in a single emissive layer

Fig. 1

Exciton allocation in single-emissive-layer, TADF WOLEDs comprising a D–A exciplex host, a blue emitter, and a yellow emitter. Inefficient energy transfer occurs from the exciplex host to the blue emitter and subsequently to the yellow emitter, due to a large energy gap between the blue and yellow emitters (~0.6 eV). The proposed exciplex, based on a high triplet donor and a low triplet acceptor, generates a large triplet gap between a high-lying T2 and a low-lying T1. This design enables efficient ladder-like (~0.3 eV ladder spacing) triplet energy transfer from T2 → blue emitter → T1 → yellow emitter. ET, IC, ISC, and RISC refer to energy transfer, internal conversion, intersystem crossing, and reverse ISC, respectively.

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