Fabrication of high efficiency and color stable white organic light-emitting diodes by an alignment free mask patterning
✍ Scribed by Kyoung Soo Yook; Soon Ok Jeon; Chul Woong Joo; Jun Yeob Lee
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 364 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1566-1199
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✦ Synopsis
Small molecule based white organic light-emitting diodes were fabricated by using an alignment free mask patterning method. A phosphorescent red/green emitting layer was patterned by a metal mask without any alignment and a blue phosphorescent emitting layer was commonly deposited on the patterned red/green emitting layer. A white emission could be obtained due to separate emission of red/green and blue emitting layers. A maximum current efficiency of 30.7 cd/A and a current efficiency of 26.0 cd/A at 1000 cd/m 2 were obtained with a color coordinate of (0.39, 0.45). In addition, there was little change of emission spectrum according to luminance because of balanced red/green and blue emissions.