Quantum-dot and organic hybrid tandem light-emitting diodes with multi-functionality of full-color-tunability and white-light-emission

• Published in: Nature communications Vol. 11; no. 1; p. 2826
• Main Authors: Zhang, Heng, Su, Qiang, Chen, Shuming
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 04.06.2020; Nature Publishing Group; Nature Portfolio
• Subjects: 639/624/1020/1089; 639/624/1020/1091; 639/624/399/1017; Color; Direct current; Electrodes; Humanities and Social Sciences; Indium; Inkjet printing; Light emission; Light emitting diodes; multidisciplinary; Quantum dots; Quantum efficiency; Science; Science (multidisciplinary); Stacking; Television; White light; Zinc oxide; Zinc oxides
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-020-16659-x

Realizing of full-color quantum-dot LED display remains a challenge because of the poor stability of the blue quantum-dot and the immature inkjet-printing color patterning technology. Here, we develop a multifunctional tandem LED by stacking a yellow quantum-dot LED with a blue organic LED using an indium–zinc oxide intermediate connecting electrode. Under parallel connection and alternate-current driving, the tandem LED is full-color-tunable, which can emit red, green and blue primary colors as well as arbitrary colors that cover a 63% National Television System Committee color triangle. Under series connection and direct current driving, the tandem LED can emit efficient white light with a high brightness of 107000 cd m −2 and a maximum external quantum efficiency up to 26.02%. The demonstrated hybrid tandem LED, with multi-functionality of full-color-tunability and white light-emission, could find potential applications in both full-color-display and solid-state-lighting. Designing efficient light-emitting diodes with full-color-tunability and white-light-emission remains a challenge. Here, the authors demonstrate a multifunctional hybrid tandem LED by stacking a yellow quantum-dot LED with a blue organic LED using an indium–zinc oxide intermediate connecting electrode.