High efficiency and ultra-wide color gamut quantum dot LEDs for next generation displays

• Published in: Journal of the Society for Information Display Vol. 23; no. 11; pp. 523 - 528
• Main Authors: Manders, Jesse R., Qian, Lei, Titov, Alexandre, Hyvonen, Jake, Tokarz-Scott, Jean, Acharya, Krishna P., Yang, Yixing, Cao, Weiran, Zheng, Ying, Xue, Jiangeng, Holloway, Paul H.
• Format: Journal Article
• Language: English
• Published: Campbell Blackwell Publishing Ltd 01-11-2015; Wiley Subscription Services, Inc
• Subjects: Color; displays; Efficiency; full-color gamut; NTSC; Printing industry; QD-LED; QLED; Quantum dots; Rec. 2020; solution processing
• ISSN: 1071-0922; 1938-3657
• DOI: 10.1002/jsid.393

Colloidal quantum dot‐based hybrid light‐emitting diodes (QLEDs) have been demonstrated that exhibit quantum efficiencies (EQEs) >10% for all three fundamental colors red, green, and blue (21% EQE, 82 cd/A for green). This is the first report of a green QLED with EQE >20% and current efficiency >80 cd/A. The devices have the longest lifetimes reported in the literature (280k hrs) and extremely well‐tuned color fidelity. The narrow QLED emission spectra (full width at half maximum  < 30 nm) and well‐controlled peak wavelengths generate a color gamut covering >170% of the National Television System Committee (NTSC) 1987 color space and ~90% of the Rec. 2020 color space. This color gamut is larger than that of OLED televisions in mass production and is the largest of all QLEDs reported. Additionally, these devices are completely fabricated using solution‐processing techniques. The extremely desirable properties of high efficiency, color tunability/fidelity, long lifetime, and low cost processing from solutions make QLED technology disruptive and will lead to next generation displays.
Colloidal quantum dot‐based light‐emitting diodes have been demonstrated, which exhibit external quantum efficiencies (EQE) >10% for red, green, and blue (21% EQE, 82 cd/A for green). The devices have long lifetimes of >280k hours and extremely well‐tuned color fidelity covering 170% of the National Television System Committee 1987 color space and 90% of the Rec. 2020 color space. In addition to the high efficiency and extremely pure colors, these devices are completely solution processed, making them a disruptive technology leading to next‐generation displays.