Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer

Hsin Wei Lu, Po Ching Kao, Sheng-Yuan Chu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the efficiency of organic light-emitting diodes (OLEDs) was enhanced by depositing a CeF3 film as an ultra-thin buffer layer between the ITO and NPB hole transport layer, with the structure configuration ITO/CeF3 (1 nm)/NPB (40 nm)/Alq3 (60 nm)/LiF (1 nm)/Al (150 nm). The enhancement mechanism was systematically investigated via several approaches. The work function increased from 4.8 eV (standard ITO electrode) to 5.2 eV (1-nm-thick UV-ozone treated CeF3 film deposited on the ITO electrode). The turn-on voltage decreased from 4.2 V to 4.0 V at 1 mA/cm2, the luminance increased from 7588 cd/m2 to 10820 cd/m2, and the current efficiency increased from 3.2 cd/A to 3.5 cd/A when the 1-nm-thick UV-ozone treated CeF3 film was inserted into the OLEDs.

Original languageEnglish
Title of host publicationOrganic Light Emitting Materials and Devices XX
EditorsFranky So, Chihaya Adachi, Jang-Joo Kim
PublisherSPIE
ISBN (Electronic)9781510602731
DOIs
Publication statusPublished - 2016 Jan 1
EventOrganic Light Emitting Materials and Devices XX - San Diego, United States
Duration: 2016 Aug 282016 Aug 30

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9941
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherOrganic Light Emitting Materials and Devices XX
CountryUnited States
CitySan Diego
Period16-08-2816-08-30

Fingerprint

Organic Light-emitting Diodes
Organic light emitting diodes (OLED)
power efficiency
Cerium
Buffer layers
cerium
ITO (semiconductors)
fluorides
Buffer
Injection
light emitting diodes
Ozone
buffers
injection
Electrode
ozone
Electrodes
Luminance
electrodes
Enhancement

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Lu, H. W., Kao, P. C., & Chu, S-Y. (2016). Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer. In F. So, C. Adachi, & J-J. Kim (Eds.), Organic Light Emitting Materials and Devices XX [994124] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9941). SPIE. https://doi.org/10.1117/12.2237242
Lu, Hsin Wei ; Kao, Po Ching ; Chu, Sheng-Yuan. / Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer. Organic Light Emitting Materials and Devices XX. editor / Franky So ; Chihaya Adachi ; Jang-Joo Kim. SPIE, 2016. (Proceedings of SPIE - The International Society for Optical Engineering).
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Lu, HW, Kao, PC & Chu, S-Y 2016, Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer. in F So, C Adachi & J-J Kim (eds), Organic Light Emitting Materials and Devices XX., 994124, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9941, SPIE, Organic Light Emitting Materials and Devices XX, San Diego, United States, 16-08-28. https://doi.org/10.1117/12.2237242

Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer. / Lu, Hsin Wei; Kao, Po Ching; Chu, Sheng-Yuan.

Organic Light Emitting Materials and Devices XX. ed. / Franky So; Chihaya Adachi; Jang-Joo Kim. SPIE, 2016. 994124 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9941).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Lu HW, Kao PC, Chu S-Y. Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer. In So F, Adachi C, Kim J-J, editors, Organic Light Emitting Materials and Devices XX. SPIE. 2016. 994124. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.2237242