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1 March 2010 Improvement in lifetime of green organic light-emitting device
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We have proposed a novel encapsulation method with simple process in comparison with conventional encapsulation technique. Here, the encapsulation film of silicon dioxide is steady for external environment because this can be designed to cover the emitting organic material from air. Silicon dioxide of 220 nm was deposited by plasma enhanced chemical vapor deposition and etched by reactive ion etching system. Then, Alq3 was used as a material to emitting layer in the green (organic light emitting device) OLED and TPD in the hole transportation layer was used for the harmonious transportation of hole. Luminance was measured with 40 hour intervals at the air-exposed condition. After 400, 1,000, 1,600, and 2,000 hours, luminance of green OLED were 7,366, 7,200, 6,210, and 5,100 cd/m2, respectively. Luminance of green OLED doesn't decrease until 2,000 hours. As a results, proposed encapsulation technique can increase the life time of green OLED.
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Hyun Chul Ki, Seon Hoon Kim, Doo Gun Kim, Hyun Jin Kim, Hang Ju Ko, Myung-Soo Han, Hwe Jong Kim, and Kyung Jin Hong "Improvement in lifetime of green organic light-emitting device", Proc. SPIE 7599, Organic Photonic Materials and Devices XII, 75991M (1 March 2010);


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