Abstract
Tandem quantum-dot light-emitting diodes (QLEDs) with multiple QLED elements vertically connected by the intermediate electrodes offer the advantages of high brightness and long lifetime. However, it is challenging to individually address each QLED element in conventional tandem structures. To address this challenge, here, transparent QLEDs built on flexible plastic substrates are developed as the building blocks for the tandem QLEDs. By vertically integrating a red, a green, and a blue transparent QLEDs with an ultraviolet glue, the resultant tandem QLED can emit separately controllable red/green/blue (R/G/B) emission with an external quantum efficiency (EQE) of 12.0%/8.5%/4.5%, respectively. Enabled by the transparent and extractable IZO electrodes, the QLED elements can also be connected in series or in parallel with an EQE of 24.8% or 8.2%, respectively. Our work provides a new implementation strategy for the realization of tandem QLEDs with individually addressable R/G/B emission for both display and lighting applications.
Highlights
Tandem quantum-dot (QD) light-emitting diodes (LEDs) with multiple LED elements vertically stacked offer the advantages of high brightness and long lifetime, and have been hotly investigated as one of the promising displays and lighting devices[1,2,3,4]
In conventional tandem quantum-dot light-emitting diodes (QLEDs), the LED elements are connected by the intermediate connection layers (ICL), which typically consist of a p-type and a n-type semiconductor layers and have a function of generating charge carriers for adjacent LED elements[5,6,7]
The red/green/ blue (R/G/B) transparent QLEDs are independently built on the flexible polyethylene naphthalate (PEN) substrates, and they are vertically assembled by using an ultraviolet (UV)-curable glue; by extracting the electrodes of each LED elements, the resultant tandem QLED can emit separately controllable R/G/B emission with an external quantum efficiency (EQE) of 12.0%/8.5%/4.5%, respectively
Summary
Tandem quantum-dot (QD) light-emitting diodes (LEDs) with multiple LED elements vertically stacked offer the advantages of high brightness and long lifetime, and have been hotly investigated as one of the promising displays and lighting devices[1,2,3,4].
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