| Summary: | 碩士 === 南臺科技大學 === 光電工程系 === 104 === The fabrication of indium tin oxide (ITO) transparent conductive film has been a mature technology and been practically employed for flat panel display industry. However, several ITO film properties need to be improved for organic light-emitting diode (OLED) applications, such as ITO surface work function and roughness.
This study employs, recessed micro-structures surfaces, on ITO surface to enhance light extraction. The recess are 50nm and 90nm deep and have a coverage ratios of 7.9%, 14.1%, 20.9%, and 27.7%.
OLED devices were fabricated on these structures and were investigated to realize how these micro-structures influence the characteristics of OLEDs, especially on the light extraction efficiency.
Result showed that an OLED device with an ITO anode of 50 nm and 7.9%
recessed could reach a current efficiency of 47.4 cd/A, enhanced by 92% compared to a planar device of 24.6 cd/A. The enhanced efficiency was mainly attributed to the created micro-structures that generate deflection and scattering interfaces to re-guide the emitted light away from being total reflected, leading to an enhanced light extraction efficiency.
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