Improving the optical properties of organic light-emitting diodes using random nanoscale rods with a double refractive index

Jin Ho Kwack, Ha Hwang, Junhee Choi, Younguk Choi, Young Wook Park, Byeong Kwon Ju

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    In this study, random nanoscale rods (RNRs) with a double refractive index were fabricated via spin coating, dry etching, and sputtering, which are processes that are extensively applied in industry. With regard to optical properties, the RNRs with a double refractive index (RNRsD) exhibited a total transmittance that was >90% in the visible range and an optical haze in the range of 42%-50% at a wavelength of 520 nm. Organic light-emitting diodes (OLEDs) with RNRsD, where SiO2 was deposited on the RNRs via radiofrequency sputtering, exhibited an enhancement of 34.5% in the external quantum efficiency compared with OLEDs with the bare substrate. Furthermore, the color variation of the OLEDs with the optimal RNRsD with respect to a change in the viewing angle was improved from color coordinates of Δ(x, y) = (0.032, 0.034) to Δ(x, y) = (0.014, 0.014). Therefore, the proposed film can be used as a scattering layer for enhancing the light extraction and viewing angle of OLEDs by reducing the substrate mode light loss and changing the direction of light. In addition to using a low-Temperature fabrication process that does not employ a photomask and a lithographic template, the proposed method is applicable to flexible devices because it uses a polymer and a thin inorganic film.

    Original languageEnglish
    Article number335205
    JournalNanotechnology
    Volume31
    Issue number33
    DOIs
    Publication statusPublished - 2020 Aug 14

    Bibliographical note

    Publisher Copyright:
    © 2020 IOP Publishing Ltd.

    Keywords

    • light extraction
    • organic light-emitting diodes (OLEDs)
    • random nanoscale rods
    • substrate mode
    • viewing angle

    ASJC Scopus subject areas

    • Bioengineering
    • General Chemistry
    • General Materials Science
    • Mechanics of Materials
    • Mechanical Engineering
    • Electrical and Electronic Engineering

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