Direct evidence of n-type doping in organic light-emitting devices: N free Cs doping from CsN3

Autor:	Yeonjin Yi, Pyungeun Jeon, Hyunbok Lee, Jeong Won Kim, Kwangho Jeong, Jeihyun Lee, Tae Gun Kim
Rok vydání:	2012
Předmět:	Physics and Astronomy (miscellaneous) Photoemission spectroscopy Inorganic chemistry Doping Analytical chemistry chemistry.chemical_element Alkali metal chemistry.chemical_compound chemistry Aluminium Caesium Azide Current density Deposition (law)
Zdroj:	Applied Physics Letters. 100:203301
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.4718017
Popis:	Cesium azide (CsN3) is confirmed to be decomposed during thermal evaporation. Only Cs could be deposited on tris(8-hydroxyquinolinato)aluminum (Alq3) and n-type doping is easily achieved. Organic light-emitting devices with CsN3 show highly improved current density-luminance-voltage characteristics compared to the control device without CsN3. 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 CsN3 on Alq3. CsN3 has a potential as alternative to doping the electron transport layer by replacing the direct deposition of alkali metals.
Databáze:	OpenAIRE
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