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Improvement in life time of green organic light emitting device

Author:
Ki, Hyun Chul  Kim, Seon Hoon  Kim, Doo Gun  Kim, Hyun Jin  Ko, Hang Ju  Han, Myung-Soo  Kim, Hwe Jong  


Journal:
ORGANIC PHOTONIC MATERIALS AND DEVICES XII


Issue Date:
2010


Abstract(summary):

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, Alq(3) 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/m(2), 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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