Quantum-dot and organic hybrid tandem light-emitting diodes with color-selecting intermediate electrodes for full-color displays

Zhang, Heng; Chen, Lianna; Chen, Shuming

doi:10.1039/d1nr04630f

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…In white organic light-emitting diodes (OLEDs), color filters, a distributed Bragg reflector (DBR), and patterned ITO cavity spacers have been used to fabricate the full-color OLEDs [23], in which there is still room to further improve the color purity for display applications. Very recently, the QD hybrid OLEDs [24] and the pixelated QLEDs [25] with cavities for highresolution displays were also realized. For most bottomemitting structures, because the ITO spacer is located between the EML and the glass, which has a low reflectance, there is a concern in the modulation of the microcavity.…”

Section: Introductionmentioning

confidence: 99%

Full-Color Quantum Dot Light-Emitting Diodes Based on Microcavities

Mei

Wang

et al. 2022

IEEE Photonics J.

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Full-color display is a primary challenge for the commercialization of quantum dots (QDs). In this study, we utilize the spectral narrowing phenomenon of microcavities to fabricate the red, green and blue quantum dot light-emitting diodes (QLEDs) with a single QD layer. This work theoretically analyses the role of microcavities in adjusting the emitting color of QLEDs. By enhanced microcavity and properly chosen spacer thickness, the spectral selectivity shifts, realizing the full-color-tunability of QLEDs. The tunable experimental spectra of microcavity QLEDs are observed, in excellent agreement with our theoretical design. Benefiting from the spectral narrowing of microcavity and the narrow spectra of QDs, a high color purity with full width at half maximum (FWHM) of 18 to 25 nm is realized, leading to a color gamut ratio of 104.8% compared to National Television System Committee (NTSC) standard. The light extraction is also enhanced by constructive interference and the Purcell effect in the microcavity. Moreover, in the fabrication of red, green, and blue pixels, patterning the transparent cathode has better feasibility and lower damage relative to patterning the light-emitting layer.

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Section: Introductionmentioning

confidence: 99%

Full-Color Quantum Dot Light-Emitting Diodes Based on Microcavities

Mei

Wang

et al. 2022

IEEE Photonics J.

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Hybrid Design of Light‐Emitting Diodes in Tandem Structures

Xie,

Liao,

Fung

2024

Adv Funct Materials

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Organic light‐emitting diodes in tandem structures (TOLEDs) have long been an effective strategy to realize multifold increased electroluminescence (EL) efficiency relative to the single‐unit OLEDs, making TOLEDs promising candidates for lighting and display applications. Benefitted from the development of organic emitters, hybrid tandem OLEDs (HTOLEDs) composing two or more types of OLED emitters (phosphorescence, fluorescence, and thermally‐activated delayed fluorescence (TADF)) are developed. The different energy conversion processes of these emitters can facilitate manipulated exciton distribution inside the device, leading to enhanced device performance. On the other hand, different emission technologies can also be integrated to form another kind of hybrid tandem light‐emitting diodes (HTLED) thanks to the compatibility of OLEDs with quantum dot LEDs (QLEDs) and perovskite LEDs (PeLEDs). In this review, the performance of different types of HTOLEDs and HTLEDs is comprehensively reviewed particularly focusing on the exciton regulations and manipulation of emission spectra in the sub‐units, aiming to provide guidelines for the EL performance optimization of HTOLEDs.

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Quantum-dot and organic hybrid tandem light-emitting diodes with color-selecting intermediate electrodes for full-color displays

Abstract: The immaturity of color patterning technology and the poor stability of blue (B) quantum-dots are two of the challenges that restrict the development of quantum-dot electroluminescence displays. In this work,...

Cited by 2 publications

References 43 publications

Full-Color Quantum Dot Light-Emitting Diodes Based on Microcavities

Full-Color Quantum Dot Light-Emitting Diodes Based on Microcavities

Hybrid Design of Light‐Emitting Diodes in Tandem Structures

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