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

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Improved hole-injection and power efficiency of organic light-emitting diodes using an ultrathin cerium fluoride buffer layer'. Together they form a unique fingerprint.

Cite this