Solution-processible corrugated structure and scattering layer for enhanced light extraction from organic light-emitting diodes

• Published in: Journal of Information Display Vol. 13; no. 4; pp. 151 - 157
• Main Authors: Hyun, Woo Jin, Im, Sang Hyuk, Park, O Ok, Chin, Byung Doo
• Format: Journal Article
• Language: Korean
• Published: 2012
• Subjects: corrugated structure; light extraction; scattering layer; organic light-emitting diodes; sol-gel
• ISSN: 1598-0316; 2158-1606

A simple method of fabricating out-coupling structures was demonstrated via solution-processing to enhance light extraction from organic light-emitting diodes (OLEDs). Scattering layers were easily obtained by spin-coating an $SiO_2$ sol solution that contained $TiO_2$ particles. By introducing the scattering layer and the solution-processible corrugated structure as internal and external extraction layers, the OLEDs showed increased external quantum efficiency without a change in the electroluminescence spectrum compared to conventional devices. Using these solution-processible out-coupling structures, nearly all-solution-processed OLEDs with enhanced light extraction could be fabricated. The light extraction enhancement is attributed to the suppression by the out-coupling structures of the light-trapping that arose at the interface of the glass substrate and the air.