Destructive Optical Interference of Ambient Light for High Contrast Organic Light-Emitting Diode Using Inorganic Metal Multi-Layer

Abstract

We fabricated high contrast red, green, blue organic light-emitting diodes using inorganic metal multi layer (IMML) composed of thin Al, KBr, and thick Al. High contrast OLEDs using IMML were observed to compare with conventional OLEDs with circular polarizer and bare metal-electrode normal OLEDs. Average ambient reflectance of OLEDs using inorganic multi layer, polarizer OLEDs, and normal OLEDs were 18.2, 31.1, and 82.5% respectively. Contrast ratio of inorganic metal multi-layer OLED with red emission and polarizer attached OLED were same as 186:1 especially.

Keywords:

• Ambient light cancelation
• high contrast
• IMML
• non-polarizer
• OLED

Acknowledgments

This research was supported by a grant (F0004141-2009-31) from Information Display R&D Center, one of the 21st Century Frontier R&D Programs funded by the Ministry of Knowledge & Economics of Korean government.