We report on the cascading of blue light-emitting diodes (LEDs) up to three junctions using low-resistance InGaN tunnel junctions (TJs). At a forward current density of 10 A/cm 2 , triple- and dual-junction LEDs operated at 9.09 and 6.07 V with total differential resistances of 6.31 × 10 −2 and 4.16 × 10 −2 Ω cm 2 , respectively. A significant increase in output power was observed from the triple-junction LED compared to the dual one, showing that all LED layers contribute to the luminescence output. Enabling high brightness at low current, cascaded LEDs can circumvent efficiency droop mechanism.
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Akyol et al. (2015) studied this question.
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