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http://dx.doi.org/10.5012/bkcs.2011.32.9.3290

Salen-Aluminum Complexes as Host Materials for Red Phosphorescent Organic Light-Emitting Diodes  

Bae, Hye-Jin (Department of Chemistry, KAIST)
Hwang, Kyu-Young (Department of Chemistry, KAIST)
Lee, Min-Hyung (Department of Chemistry and Energy Harvest-Storage Research Center, University of Ulsan)
Do, Young-Kyu (Department of Chemistry, KAIST)
Publication Information
Bulletin of the Korean Chemical Society / v.32, no.9, 2011 , pp. 3290-3294 More about this Journal
Abstract
The properties of monomeric and dimeric salen-aluminum complexes, [salen(3,5-$^tBu)_2$Al(OR)], R = $OC_6H_4-p-C_6H_6$ (H1) and R = [salen(3,5-$^tBu$)AlOPh]C$(CH_3)_2$ (H2) (salen = N,N'-bis-(salicylidene)-ethylenediamine) as host layer materials in red phosphorescent organic light-emitting diodes (PhOLEDs) were investigated. H1 and H2 exhibit high thermal stability with decomposition temperature of 330 and $370^{\circ}C$. DSC analyses showed that the complexes form amorphous glasses upon cooling of melt samples with glass transition temperatures of 112 and $172^{\circ}C$. The HOMO (ca. -5.2~-5.3 eV) and LUMO (ca. -2.3~-2.4 eV) levels with a triplet energy of ca. 1.92 eV suggest that H1 and H2 are suitable for a host material for red emitters. The PhOLED devices based on H1 and H2 doped with a red emitter, $Ir(btp)_2$(acac) (btp = bis(2-(2'-benzothienyl)-pyridinato-N,$C^3$; acac = acetylacetonate) were fabricated by vacuum-deposition and solution process, respectively. The device based on vacuum-deposited H1 host displays high device performances in terms of brightness, luminous and quantum efficiencies comparable to those of the device based on a CBP (4,4'-bis(Ncarbazolyl) biphenyl) host while the solution-processed device with H2 host shows poor performance.
Keywords
Salen-aluminum complex; Host materials; Red phosphorescence; OLEDs;
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