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Journal of Photonics for Energy

Improvement of device efficiency for blue organic light emitting diodes by controlling the Cs2CO3-doped electron transport layer
Author(s): Richard Fu; Jianmin Shi; Eric Forsythe; Steven Blomquist; Merric Srour; David C. Morton
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Paper Abstract

The electronic transport properties of 1, 3, 5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)phenyl (TPBI) electron transporting layers (ETLs) have been investigated as a function of cesium carbonate (Cs2CO3) doping for organic light-emitting diodes (OLEDs). The current density-voltage and light emission characteristics were measured as a function of the Cs2CO3-doped ETL thickness. Cs2CO3-doped TPBI decreased OLED operating voltage by 26% and increased device luminance by 17% in a wide concentration range (3.5% to 10.5%) compared to undoped devices. The effects of 7% Cs2CO3-doped ETL thickness indicated that the operating voltage continuously decreased to 37% when the ETL thickness increased to 600 Å and luminance output continued to increase to 21% at ETL thickness 525 Å. The blue OLED can be optimized by adjusting the thicknesses of Cs2CO3-doped TPBI ETL to balance the electron and hole injection.

Paper Details

Date Published: 24 September 2014
PDF: 7 pages
J. Photon. Energy 4(1) 043595 doi: 10.1117/1.JPE.4.043595
Published in: Journal of Photonics for Energy Volume 4, Issue 1
Show Author Affiliations
Richard Fu, U.S. Army Research Lab. (United States)
Jianmin Shi, U.S. Army Research Lab. (United States)
Eric Forsythe, U.S. Army Research Lab. (United States)
Steven Blomquist, U.S. Army Research Lab. (United States)
Merric Srour, U.S. Army Research Lab. (United States)
David C. Morton, U.S. Army Research Lab. (United States)

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