Fig. 2: Tandem QLEDs operate in series mode.
From: Face-to-face integrated tandem quantum-dot LEDs with high performance and multifunctionality
a The schematic diagram of electrical connection in series mode. The b J-V-L, c the EQE-J, d the PE-L, and e the L-J characteristic curves of the top and the bottom units driven in both independent and series modes. f Radar chart summarizing the device performance of this work and references
