Enhancement of efficiency for white-organic light-emitting diode with a thin electron-blocking layer

Jung Soo Park, Joo Won Lee, Young Min Kim, Sung Jin Bae, Jin Jang, Jai Kyeong Kim, Byeong Kwon Ju

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study, we have enhanced the emission property of white-organic light-emitting diodes using the method of inserting the ultrathin electron-blocking layer (thin-EBL) between red-green-blue emissive layers. The devices into which three emissive layers are inserted were fabricated with indium tin oxide/CuPc/[A',A''-di(naphthalene-l-yl)-N,N′-diphenyl- benzidine] (α-NPD/DPVBi/thin-EBL/Alq3/Alq3: 2 wt % 4-(dicyano-methylene)-2-methyl-6-(dirnethylaminostyryl-4tf-pyran (DCM1)/ Alq3/LiF:Al. To enhance the white emission property and improve the efficiency of devices, we suggest the α-NPD as the thin-EBL. According to knowledge of the energy band diagram, α-NPD was inserted between the blue-emitting layer and green-emitting layer. The a-NPD layer showed the effective blocking of electron as a function of thickness. From the Experimental, the effective blocking of electrons through controlling the thin-EBL thickness embodied the balanced white emission and improved the efficiency of the device. In our device with 0.3 nm α-NPD, it had a maximum power efficiency of 3.80 Im/W at 250 cd/m2, a luminance efficiency of 5.14 cd/A at 4.83 mA/m2, a luminance of 1200 cd/m 2 at 100 mA/cm2, and the CIE coordinates were (0.353, 0.357), respectively.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume152
Issue number11
DOIs
Publication statusPublished - 2005 Dec 2

Fingerprint

Organic light emitting diodes (OLED)
light emitting diodes
Electrons
augmentation
Luminance
electrons
luminance
Pyrans
Naphthalene
Tin oxides
Band structure
Indium
power efficiency
naphthalene
methylene
indium oxides
tin oxides
energy bands
neodymium pyrocatechin disulfonate
diagrams

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Enhancement of efficiency for white-organic light-emitting diode with a thin electron-blocking layer. / Park, Jung Soo; Lee, Joo Won; Kim, Young Min; Bae, Sung Jin; Jang, Jin; Kim, Jai Kyeong; Ju, Byeong Kwon.

In: Journal of the Electrochemical Society, Vol. 152, No. 11, 02.12.2005.

Research output: Contribution to journalArticle

Park, Jung Soo ; Lee, Joo Won ; Kim, Young Min ; Bae, Sung Jin ; Jang, Jin ; Kim, Jai Kyeong ; Ju, Byeong Kwon. / Enhancement of efficiency for white-organic light-emitting diode with a thin electron-blocking layer. In: Journal of the Electrochemical Society. 2005 ; Vol. 152, No. 11.
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