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NOGUCHI Yutaka
Department Undergraduate School , School of Science and Technology Position Professor |
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| Language | English |
| Publication Date | 2016/01 |
| Type | Academic Journal |
| Peer Review | Peer reviewed |
| Title | Significant relaxation of residual negative carrier in polar Alq3 film directly detected by high-sensitivity photoemission |
| Contribution Type | Co-authored (other than first author) |
| Journal | Applied Physics Express |
| Journal Type | Another Country |
| Publisher | IOP science |
| Volume, Issue, Page | 9(2),pp.021601-1-021601-4 |
| Author and coauthor | ◎Hiroumi Kinjo, Hyunsoo Lim, Tomoya Sato, Yutaka Noguchi, Yasuo Nakayama, and Hisao Ishii |
| Details | Tris(8-hydroxyquinoline)aluminum (Alq3) has been widely applied as a good electron-injecting layer (EIL) in organic light-emitting diodes. Highsensitivity photoemission measurement revealed a clear photoemission by visible light, although its ionization energy is 5.7 eV. This unusual photoemission is ascribed to Alq3 anions captured by positive polarization charges. The observed electron detachment energy of the anion was about 1 eV larger than the electron affinity reported by inverse photoemission. This difference suggests that the injected electron in the Alq3 layer is energetically relaxed, leading to the reduction in injection barrier. This nature is one of the reasons why Alq3 worked well as the EIL. |
| DOI | http://doi.org/10.7567/APEX.9.021601 |