Electrical Characteristics of Organic Light-emitting Diodes Fabricated by Varying a Hole-size in Evaporation BoatElectrical Characteristics of Organic Light-emitting Diodes Fabricated by Varying a Hole-size in Evaporation Boat
- Other Titles
- Electrical Characteristics of Organic Light-emitting Diodes Fabricated by Varying a Hole-size in Evaporation Boat
- Authors
- Weon-Jong Kim; Young-Ha Park; Kyung-Soon Cho; Jin-Woong Hong; Jong-Yeol Shin; Tae Wan Kim
- Issue Date
- 2008
- Publisher
- 한국전기전자재료학회
- Keywords
- Hole-size of evaporation boat; Average roughness; Luminance; External quantum efficiency; Operating voltage
- Citation
- Transactions on Electrical and Electronic Materials, v.9, no.3, pp.105 - 109
- Journal Title
- Transactions on Electrical and Electronic Materials
- Volume
- 9
- Number
- 3
- Start Page
- 105
- End Page
- 109
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/23399
- ISSN
- 1229-7607
- Abstract
- Electrical characteristics of organic light-emitting diodes were investigated by varying a hole-size in evaporation boat in the device structure of ITO/tris(8-hydroxyquinoline) aluminum(Alq₃)/Al. The device was manufactured using a thermal evaporation under a base pressure of 5ⅹ10^-6 Torr. The Alq3 emitting organics were evaporated to be a thickness of 100 nm at a deposition rate of 1.5 A/s. A cylindrical-shaped evaporation boat was made out of stainless steel with a small size of hole on top of the boat. Several evaporation boats were made having a different hole size on top; 0.8 mm, 1.0 mm, 1.5 mm, and 3.0 mm. We found that when the hole size on top of the evaporation boat is 1.0 mm, the average roughness is rather smoother compared to the other ones. Also, luminance and external quantum efficiency are superior to the others. Compared to the ones from the devices made with the hole-size of 0.8 mm boat. The luminance and external quantum efficiency of the device made with the hole-size of 1.0 mm boat were improved by a factor of seventy and thirty three, respectively. Also operating voltage is reduced to 2 V.
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