Share Email Print
cover

Journal of Photonics for Energy • Open Access

Blue phosphorescent organic light-emitting devices utilizing cesium-carbonate-doped 2,4,6-tris(2′,4′-difluoro-[1,1′-biphenyl]-4-yl)-1,3,5-triazine
Author(s): James S. Swensen; James E. Rainbolt; Liang Wang; Phillip K. Koech; Evgueni Polikarpov; Asanga B. Padmaperuma; Daniel J. Gaspar

Paper Abstract

We report an alternative, high-yielding synthesis for the known compound 2,4,6-tris(2′,4′-difluoro-[1,1′-biphenyl]-4-yl)-1,3,5-triazine (tris-(dFB)Tz). The energy of the lowest unoccupied molecular orbital (ELUMO) for tris-(dFB)Tz is estimated to be −3.5 eV from electrochemical measurements. The deep ELUMO of tris-(dFB)Tz affords a material with excellent electron acceptor characteristics for use in n-doped electron transport layers. Tris-(dFB)Tz shows a four order of magnitude increase in the number of carriers on doping with 8 wt. % Cs2CO3. Enhanced electron injection was also observed on doping with Cs2CO3, which eliminated the necessity for a separate LiF electron injection layer. Blue phosphorescent organic light-emitting devices (OLEDs) were fabricated using n-doped tris-(dFB)Tz electron transport layers. OLEDs with thick (700-Å) Cs2CO3-doped tris-(dFB)Tz electron transport layers had lower operating voltages than OLEDS with an undoped electron transport layer of bis(diphenylphosphoryl)dibenzothiophene (PO15), which has previously been used in low-voltage, high-efficiency OLEDs. The tris-(dFB)Tz results indicate that aromatic substituted triazines may be promising materials for use as electron acceptors in n-doped organic electronic systems.

Paper Details

Date Published: 1 January 2011
PDF: 12 pages
J. Photon. Energy. 1(1) 011008 doi: 10.1117/1.3528003
Published in: Journal of Photonics for Energy Volume 1, Issue 1
Show Author Affiliations
James S. Swensen, Pacific Northwest National Lab. (United States)
James E. Rainbolt, Pacific Northwest National Lab. (United States)
Liang Wang, Pacific Northwest National Lab. (United States)
Phillip K. Koech, Pacific Northwest National Lab. (United States)
Evgueni Polikarpov, Pacific Northwest National Lab. (United States)
Asanga B. Padmaperuma, Pacific Northwest National Lab. (United States)
Daniel J. Gaspar, Pacific Northwest National Lab. (United States)


© SPIE. Terms of Use
Back to Top