Direct evidence of n-type doping in organic light-emitting devices: N free Cs doping from CsN 3

Jeihyun Lee, Hyunbok Lee, Pyungeun Jeon, Kwangho Jeong, Tae Gun Kim, Jeong Won Kim, Yeonjin Yi

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Cesium azide (CsN 3) is confirmed to be decomposed during thermal evaporation. Only Cs could be deposited on tris(8-hydroxyquinolinato)aluminum (Alq 3) and n-type doping is easily achieved. Organic light-emitting devices with CsN 3 show highly improved current density-luminance- voltage characteristics compared to the control device without CsN 3. To understand the origin of the improvements, in situ x-ray and UV photoemission spectroscopy measurements were carried out and a remarkable reduction in electron injection barrier is verified with successive deposition of Al on CsN 3 on Alq 3. CsN 3 has a potential as alternative to doping the electron transport layer by replacing the direct deposition of alkali metals.

Original languageEnglish
Article number203301
JournalApplied Physics Letters
Issue number20
Publication statusPublished - 2012 May 14


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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