Special Section on Organic Light-Emitting Materials and Devices

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 Affiliations
James S. Swensen, James E. Rainbolt, Liang Wang, Phillip K. Koech, Evgueni Polikarpov, Asanga B. Padmaperuma, Daniel J. Gaspar

Pacific Northwest National Laboratory, Energy and Environment Directorate, Richland, Washington 99352

J. Photon. Energy. 1(1), 011008 (January 20, 2011). doi:10.1117/1.3528003
History: Received August 31, 2010; Revised October 29, 2010; Accepted November 03, 2010; Published January 20, 2011; Online January 20, 2011
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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.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

James S. Swensen ; James E. Rainbolt ; Liang Wang ; Phillip K. Koech ; Evgueni Polikarpov, et al.
"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", J. Photon. Energy. 1(1), 011008 (January 20, 2011). ; http://dx.doi.org/10.1117/1.3528003


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