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http://dx.doi.org/10.7464/ksct.2012.18.4.366

Synthesis and Optical Properties of Acrylic Copolymers Containing AlQ3 Pendant Group for Organic Light Emitting Diodes  

Kim, Eun-Young (Institute of Industrial Science and Technology, Pukyong National University)
Myung, Sung-Hyun (Department of Organic Material Science and Engineering, Pusan National University)
Lee, Young-Hee (Department of Organic Material Science and Engineering, Pusan National University)
Kim, Han-Do (Department of Organic Material Science and Engineering, Pusan National University)
Publication Information
Clean Technology / v.18, no.4, 2012 , pp. 366-372 More about this Journal
Abstract
Three acrylic copolymers containing tris(8-hydroxyquinoline) aluminum (AlQ3) pendant group (25 wt%), acrylateco-HEMA-$AlQ_3$ (25 wt%), were successfully synthesized by free radical polymerization from acrylates [methyl methacrylate (MMA), acrylonitrile (AN) or 2-hydroxyethyl methacrylate (HEMA)] with HEMA functionalized with AlQ3 pendant groups (HEMA-p-$AlQ_3$). The glass transition temperatures ($T_g$) of MMA-co-HEMA-p-$AlQ_3$ (copolymer 1), AN-co-HEMA-p-$AlQ_3$ (copolymer 2) and HEMA-co-HEMA-p-$AlQ_3$ (copolymer 3) were found to be 158, 150 and $126^{\circ}C$, respectively. They have good thermal stability: a very desirable feature for the stability of OLEDs. Their solubility, thermal properties, UV-visible absorption and photoluminescence behaviors were investigated. They were found to be soluble in various organic solvents such as tetrahydrofuran (THF), dimethylformamide (DMF), toluene and chloroform. It was also found that the UV-visible absorption and photoluminescence behaviors of these copolymers were similar to those of pristine $AlQ_3$. Green organic light-emitting diodes (OLEDs) have also been fabricated using these copolymers as light emission/electron transport components obtained easily by spin coating, and their current density voltage (J-V) curves were compared. The OLED device of the copolymer 3 had the lowest turn-on voltage of about 2 V compared to other copolymer types devices.
Keywords
$AlQ_3$; Organic light emitting diode; Acrylate; Copolymer;
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