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

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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
Volume100
Issue number20
DOIs
Publication statusPublished - 2012 May 14

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control equipment
luminance
cesium
alkali metals
electrons
photoelectric emission
evaporation
injection
current density
aluminum
electric potential
spectroscopy
x rays

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Lee, Jeihyun ; Lee, Hyunbok ; Jeon, Pyungeun ; Jeong, Kwangho ; Gun Kim, Tae ; Won Kim, Jeong ; Yi, Yeonjin. / Direct evidence of n-type doping in organic light-emitting devices : N free Cs doping from CsN 3. In: Applied Physics Letters. 2012 ; Vol. 100, No. 20.
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Direct evidence of n-type doping in organic light-emitting devices : N free Cs doping from CsN 3. / Lee, Jeihyun; Lee, Hyunbok; Jeon, Pyungeun; Jeong, Kwangho; Gun Kim, Tae; Won Kim, Jeong; Yi, Yeonjin.

In: Applied Physics Letters, Vol. 100, No. 20, 203301, 14.05.2012.

Research output: Contribution to journalArticle

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AU - Lee, Jeihyun

AU - Lee, Hyunbok

AU - Jeon, Pyungeun

AU - Jeong, Kwangho

AU - Gun Kim, Tae

AU - Won Kim, Jeong

AU - Yi, Yeonjin

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