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

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

doi:10.1117/1.3528003

1 January 2011 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

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

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Journal of Photonics for Energy, Vol. 1, Issue 1, 011008 (January 2011). https://doi.org/10.1117/1.3528003

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 E_LUMO 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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James S. Swensen, James E. Rainbolt, Liang Wang, Phillip K. Koech, Evgueni Polikarpov, Asanga B. Padmaperuma, and Daniel J. Gaspar "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," Journal of Photonics for Energy 1(1), 011008 (1 January 2011). https://doi.org/10.1117/1.3528003

Published: 1 January 2011

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