Corrugated structure through a spin-coating process for enhanced light extraction from organic light-emitting diodes

TY - JOUR

T1 - Corrugated structure through a spin-coating process for enhanced light extraction from organic light-emitting diodes

AU - Hyun, Woo Jin

AU - Im, Sang Hyuk

AU - Park, O. Ok

AU - Chin, Byung Doo

N1 - Funding Information: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (CAFDC- 20100009894 and 2010-0010039 ).

PY - 2012/4

Y1 - 2012/4

N2 - We have demonstrated a simple fabrication method for an out-coupling structure to enhance light extraction from organic light-emitting diodes (OLEDs). Spin-coating of SiO2 and TiOx sol mixture solution develops corrugated film. The structural evolution of the corrugation was explained by the localization of surface tension during the solvent evaporation. The structural parameters of the corrugated structure were characterized by varying the spin-coating speed and the mixing ratio of the solution. Compared to conventional devices, OLEDs with a corrugated structure at the backside of the glass substrate showed increased external quantum efficiency without change in the electroluminescence spectrum. The light extraction enhancement is attributed to the decreased incidence angle at the interface of glass substrate and air.

AB - We have demonstrated a simple fabrication method for an out-coupling structure to enhance light extraction from organic light-emitting diodes (OLEDs). Spin-coating of SiO2 and TiOx sol mixture solution develops corrugated film. The structural evolution of the corrugation was explained by the localization of surface tension during the solvent evaporation. The structural parameters of the corrugated structure were characterized by varying the spin-coating speed and the mixing ratio of the solution. Compared to conventional devices, OLEDs with a corrugated structure at the backside of the glass substrate showed increased external quantum efficiency without change in the electroluminescence spectrum. The light extraction enhancement is attributed to the decreased incidence angle at the interface of glass substrate and air.

KW - Corrugated structure

KW - Light extraction

KW - Organic light-emitting diodes

KW - Out-coupling structure

KW - Striation

UR - http://www.scopus.com/inward/record.url?scp=84856443580&partnerID=8YFLogxK

U2 - 10.1016/j.orgel.2012.01.001

DO - 10.1016/j.orgel.2012.01.001

M3 - 文章

AN - SCOPUS:84856443580

SN - 1566-1199

VL - 13

SP - 579

EP - 585

JO - Organic Electronics

JF - Organic Electronics

IS - 4

ER -