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15 November 2010 Improvement of OLED properties with anti-reflection coatings
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An anti-reflection (AR) coating system was inserted between the anode (ITO) and the glass substrate in the red light organic electroluminescent devices (OLED) for the structure being K9/ITO/NPB (60nm)/DCJTB (0.3nm)/Alq3 (60nm)/ LiF(0.3nm)/Al. The AR film system structure was K9/TiO2/Al2O3/2-ITO, and the optical thicknesses of TiO2 and Al2O3 coatings were also quarter wave length. The results indicated that the maximum transmissivity of AR coating was by 95 %( 610nm); it increased by 8% compared with only using ITO as AR coating. The average luminance increased by about 30%, the average energy efficiency increased by about 60%, while reducing the threshold voltage of the devices. The processing is simple and high efficient, and can change AR coating structure according to the OLED device different emission wavelength, therefore, can be widely applied to the OLED devices.
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Chunling Liu, Dongmei Wang, Lei Zhao, Wenlong Jiang, Zhengkun Qin, and Chunwu Wang "Improvement of OLED properties with anti-reflection coatings", Proc. SPIE 7852, LED and Display Technologies, 78521F (15 November 2010);

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