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.

具有通过中间电极垂直连接的多个QLED元件的串联量子点发光二极管（QLED）具有高亮度和长寿命的优点。然而，以传统的串联结构单独地寻址每个QLED元件是具有挑战性的。为了应对这一挑战，这里开发了在柔性塑料基板上构建的透明QLED，作为串联QLED的基础。通过将红色，绿色和蓝色透明QLED与紫外线胶垂直集成，所得串联QLED可以发出可独立控制的红色/绿色/蓝色（R / G / B）发射，外部量子效率（EQE）为12.0 ％/ 8.5％/ 4.5％。通过透明且可抽出的IZO电极，QLED元件也可以串联或并联连接，其EQE为24.8％或8.2％，分别。我们的工作为实现串联QLED并为显示和照明应用提供可单独寻址的R / G / B发射提供了一种新的实施策略。