Journal
ORGANIC ELECTRONICS
Volume 12, Issue 7, Pages 1177-1183Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2011.03.031
Keywords
Buckle; Ultraviolet/ozone treatment; Waveguide; Extraction; OLED
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We describe a simple and effective method to control the periodicity of the buckling structure by thermal evaporation and ultraviolet/ozone (UVO) treatment so as to effectively extract the waveguide modes in organic light emitting diode (OLED) devices, inferring an underlying buckling mechanism. The periodicity of the buckles decreased from 460 to 300 nm with the UVO treatment time, shifting the emission wavelength showing the highest enhancement ratio toward the shorter wavelengths in the device with buckles. We exemplified the outcoupling characteristics of the waveguide modes by the buckles with different periodicities. (C) 2011 Elsevier B.V. All rights reserved.
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