4.5 Article

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

Journal

IEEE PHOTONICS JOURNAL
Volume 14, Issue 2, Pages -

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3159278

Keywords

Microcavities; Interference; Color; Quantum dots; Lighting; Anodes; Industries; Cavity resonators; displays; light emitting diodes; quantum dots

Funding

  1. Ministry of Science and Technology of China [2016YFB0401702, 2017YFE0120400]
  2. National Natural Science Foundation of China [61674074, 61875082, 61405089, 62005115]
  3. Key-Area Research and Development Program of Guangdong Province [2019B010925001, 2019B010924001]
  4. Shenzhen Peacock Team Project [KQTD2016030111203005]
  5. Guangdong-Hong Kong-Macao Joint Laboratory [2019B121205001]
  6. Shenzhen Key Laboratory for Advanced Quantum Dot Displays and Lighting [ZDSYS201707281632549]
  7. Guangdong University Key Laboratory for Advanced Quantum Dot Displays and Lighting [2017KSYS007]
  8. Hong Kong Special Administrative Region, China [17200518, 17201819, 17211220, C7035-20G]

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This study explores the use of microcavities to fabricate full-color quantum dot light-emitting diodes (QLEDs) with a single QD layer. It demonstrates that by enhancing the microcavity and selecting the appropriate spacer thickness, the emitting color of the QLEDs can be tuned. The experimental results align well with the theoretical design and show high color purity and an expanded color gamut.
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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