| 학회 | 한국재료학회 |
| 학술대회 | 2016년 봄 (05/18 ~ 05/20, 여수 디오션리조트 ) |
| 권호 | 22권 1호 |
| 발표분야 | B. 나노화학/바이오 재료 분과 |
| 제목 | Cytosine electron injection layer in organic light-emitting diodes |
| 초록 | Nucleobases of deoxyribonucleic acid (DNA), such as cytosine, adenosine, guanine, and thymine, have an ability to be used as a functional interlayer in organic devices and their application is promising because of their abundance in natural resources and biodegradable property. These nucleobases have unique electronic structure so that they can modify the interfacial electronic structure between an electrode and an organic semiconductor when they are inserted between them. In this study, we investigated the effect of a cytosine layer insertion on the interfacial electronic structure between tris-(8-hydroxyquinoline)aluminum (Alq3) and Al using ultraviolet, X-ray, inverse photoelectron spectroscopy measurements and density functional theory calculations. Furthermore, organic light-emitting diodes (OLEDs) with a cytosine electron injection layer were fabricated and their device performance was measured. Cytosine induces an interface dipole on Alq3, pushing down whole energy levels of Alq3. During Al deposition, the cytosine-Al complex is formed. By both interface dipole and cytosine-Al complex, the electron injection barrier between Al and Alq3 is reduced. As a result, the device performance of cytosine-inserted OLEDs is significantly enhanced. Therefore, the cytosine layer could be widely used in organic devices. *Corresponding author : [email protected] (H. Lee), [email protected] (Y. Yi) |
| 저자 | 이연주1, 유지수1, 정관욱1, 윤영식1, 이현복2, 이연진1 |
| 소속 | 1연세대, 2강원대 |
| 키워드 | <P>DNA; Cytosine; UPS; XPS; IPES; Electronic structure; OLED</P> |
