Interfacial chemistry of Sm with Alq3 and its implication to organic light-emitting devices
✍ Scribed by Y.Q. Li; J.X. Tang; L.S. Hung
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 236 KB
- Volume
- 376
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Interfacial chemistry of samarium (Sm) with tris-(8-hydroxyquinoline) aluminum (Alq 3 ) has been investigated. Photoelectron analysis revealed strong interactions at the Sm-Alq 3 interface and limited Sm diffusion into Alq 3 . The lowest unoccupied molecular orbital of Alq 3 was found to be 0.28 eV below the Fermi level of Sm at the Sm-Alq 3 contact, implying lacking a barrier to electron-injection from the Sm to Alq 3 . Replacing Sm for MgAg as a cathode in organic electroluminescent devices considerably improved current-voltage characteristics, while the device efficiency was found to decrease by 40%. The reduction in efficiency is attributed to low optical reflectance at the Sm-Alq 3 interface.