Amorphous oxide based microcavity color filter with high selectivity

Lee, Byeong Hyeon; Lee, Sang Yeol; Kim, Sangsig; Lee, Sang Yeol

doi:10.1016/j.optmat.2020.109693

Cited by 1 publication

(1 citation statement)

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“…The microcavity effect has been employed to enhance light extraction [18], [19] and to produce narrow spectra [20], [21] in light-emitting diodes (LEDs). Based on its spectral narrowing phenomenon, a thin film color filter with high selectivity can be implemented by a microcavity structure as reported in [22]. 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.…”

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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