Efficient organic light-emitting diodes by insertion a thin lithium fluoride layer with conventional structure

Young Min Kim, Young Wook Park, Jin Hwan Choi, Jai Kyeong Kim, Byeong Kwon Ju

Research output: Contribution to journalArticle

Abstract

Insertion of a thin lithium fluoride (TLF) layer between an emitting layer (EML) and an electron transporting layer has resumed in the developement of a highly efficient and bright organic light-emitting diode (OLED). Comparing with the performance of the device as a function of position with the TLF layer in tris-(8-hydroxyquinoline) aluminum (Alq3), we propose the optimal position for the TLF layer in the stacked structure. The fabricated OLED shows a luminance efficiency of more than 20 cd/A, a power efficiency of 12 lm/W (at 20 mA/cm2), and a luminance of more than 22 000 cd/m2 (at 100 mA/cm2), respectively. We suggest that the enhanced performance of the OLED is probably attributed to the improvement of carrier balance to achieve a high level of recombination efficiency in an EML.

Original languageEnglish
Pages (from-to)26-30
Number of pages5
JournalJournal of Information Display
Volume7
Issue number2
DOIs
Publication statusPublished - 2006

Keywords

  • Carrier injection
  • Organic light-emitting diodes (OLEDs)
  • Recombination efficiency
  • Thin Lithium Fluoride (TLF) Layer

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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