Origin of the improved luminance-voltage characteristics and stability in organic light-emitting device using CsCl electron injection layer

Yeonjin Yi; Seong Jun Kang; Kwanghee Cho; Jong Mo Koo; Kyul Han; Kyongjin Park; Myungkeun Noh; Chung Nam Whang; Kwangho Jeong

doi:10.1063/1.1935773

Origin of the improved luminance-voltage characteristics and stability in organic light-emitting device using CsCl electron injection layer

Yeonjin Yi, Seong Jun Kang, Kwanghee Cho, Jong Mo Koo, Kyul Han, Kyongjin Park, Myungkeun Noh, Chung Nam Whang, Kwangho Jeong

Department of Physics

Research output: Contribution to journal › Article

38 Citations (Scopus)

Abstract

The luminance-voltage characteristics and stability were highly improved by replacing LiF with CsCl in organic light-emitting devices. To investigate the origin of these improvements, ultraviolet photoelectron spectroscopy and x-ray photoelectron spectroscopy were used. The additional shifts of the vacuum, highest occupied molecular orbital, and lowest unoccupied molecular orbital levels due to the CsCl layer reduce the width and height of the electron injection barrier, resulting in the improved luminance-voltage characteristics of the devices. Additionally, the intervening CsCl layer between Al and Alq3 prevents N-Al reactions among Alq3 molecules and Al, which reduces distortion or breakdown of Alq3 molecules and slows the degradation of the device.

Original language	English
Article number	213502
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	21
DOIs	https://doi.org/10.1063/1.1935773
Publication status	Published - 2005 May 23

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1935773

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Yi, Y., Kang, S. J., Cho, K., Koo, J. M., Han, K., Park, K., Noh, M., Whang, C. N., & Jeong, K. (2005). Origin of the improved luminance-voltage characteristics and stability in organic light-emitting device using CsCl electron injection layer. Applied Physics Letters, 86(21), 1-3. [213502]. https://doi.org/10.1063/1.1935773

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abstract = "The luminance-voltage characteristics and stability were highly improved by replacing LiF with CsCl in organic light-emitting devices. To investigate the origin of these improvements, ultraviolet photoelectron spectroscopy and x-ray photoelectron spectroscopy were used. The additional shifts of the vacuum, highest occupied molecular orbital, and lowest unoccupied molecular orbital levels due to the CsCl layer reduce the width and height of the electron injection barrier, resulting in the improved luminance-voltage characteristics of the devices. Additionally, the intervening CsCl layer between Al and Alq3 prevents N-Al reactions among Alq3 molecules and Al, which reduces distortion or breakdown of Alq3 molecules and slows the degradation of the device.",

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Origin of the improved luminance-voltage characteristics and stability in organic light-emitting device using CsCl electron injection layer. / Yi, Yeonjin; Kang, Seong Jun; Cho, Kwanghee; Koo, Jong Mo; Han, Kyul; Park, Kyongjin; Noh, Myungkeun; Whang, Chung Nam; Jeong, Kwangho.

In: Applied Physics Letters, Vol. 86, No. 21, 213502, 23.05.2005, p. 1-3.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Origin of the improved luminance-voltage characteristics and stability in organic light-emitting device using CsCl electron injection layer

AU - Yi, Yeonjin

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AU - Park, Kyongjin

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AU - Jeong, Kwangho

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AB - The luminance-voltage characteristics and stability were highly improved by replacing LiF with CsCl in organic light-emitting devices. To investigate the origin of these improvements, ultraviolet photoelectron spectroscopy and x-ray photoelectron spectroscopy were used. The additional shifts of the vacuum, highest occupied molecular orbital, and lowest unoccupied molecular orbital levels due to the CsCl layer reduce the width and height of the electron injection barrier, resulting in the improved luminance-voltage characteristics of the devices. Additionally, the intervening CsCl layer between Al and Alq3 prevents N-Al reactions among Alq3 molecules and Al, which reduces distortion or breakdown of Alq3 molecules and slows the degradation of the device.

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