Outcoupling efficiency enhancement of a bottom-emitting OLED with a visible parylene film | Zendy

Akpeko Gasonoo | Zendy; YeSeul Lee | Zendy; Ji-Hyeon Yoon | Zendy; Baeksang Sung | Zendy; Yoonseuk Choi | Zendy; Jonghee Lee | Zendy; JaeHyun Lee | Zendy

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Outcoupling efficiency enhancement of a bottom-emitting OLED with a visible parylene film

Author(s) -

Akpeko Gasonoo,

YeSeul Lee,

Ji-Hyeon Yoon,

Baeksang Sung,

Yoonseuk Choi,

Jonghee Lee,

JaeHyun Lee

Publication year - 2020

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.397789

Subject(s) - oled , materials science , parylene , xylylene , transmittance , visible spectrum , chemical vapor deposition , optoelectronics , optics , conformal coating , fabrication , coating , polymer , nanotechnology , layer (electronics) , composite material , medicine , physics , alternative medicine , pathology , polymer chemistry

We have investigated an effective and a single-step chemical vapor deposition (CVD) method to achieve conformal visible poly-dichloro-para-xylylene (parylene C) film for light extraction enhancement in bottom-emitting organic light-emitting diodes (OLEDs) at room temperature. We report that sublimed parylene dimers pyrolyzed between 400 °C and 500 °C resulted in visible parylene films with tunable transmittance and haze, exhibiting light scattering properties due to the formation of uniformly distributed dimer crystals. We achieved a novel conformal visible parylene film with total transmittance and high haze of 79.5% and 93.6%, respectively. It is observed that the outcoupling efficiency of the OLEDs employing the visible parylene film is enhanced up to 45.8%. Additionally, the OLED with the visible parylene light extraction film shows limited angle-dependency of emission spectrum over viewing angles. The single-step room temperature fabrication process of this conformal outcoupling film paves the way to achieving commercial high-performance OLEDs.

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