Multi-spiro junctions enable efficient thermally activated delayed fluorescent emitter†
He
Liu 
*a
and
Chuluo
Yang
*a
*a
and
Chuluo
Yang
*a
Abstract
A new acridine donor with trispiro junctions is developed for assembling a highly efficient thermally activated delayed fluorescence emitter. The multispiro junctions ensure a rigid geometry that leads to a well-suppressed nonradiative decay. The resulting electroluminescent devices achieve a high external quantum efficiency of 34.2%.
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