New Bipolar Host Materials for Realizing Blue Phosphorescent Organic Light-Emitting Diodes with High Efficiency at 1000 cd/m²

다국어 초록 (Multilingual Abstract)

<P>New host molecules such as 9-(6-(9<I>H</I>-carbazol-9-yl)pyridin-3-yl)-6-(9<I>H</I>-carbazol-9-yl)-9<I>H</I>-pyrido[2,3-<I>b</I>]indole (pPCB2CZ) and 9-(6-(9<I>H</I>-carbazol-9-yl)pyridin-2-yl)-6-(9<I>H</I>-carbazol-9-yl)-9<I>H</I>-pyrido[2,3-<I>b</I>]indole (mPCB2CZ) were designed and synthesized for blue phosphorescent organic light-emitting diodes (PhOLEDs). The glass transition temperatures of two host molecules were measured higher than 120 °C, and the identical triplet energies were determined to be 2.92 eV for both molecules. The bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic)-doped mPCB2CZ-based PhOLED exhibited practically useful driving voltage of 4.8 V in a simple organic three layer device configuration which has a smaller number of interfaces in conventional multilayer PhOLEDs. Also, the high quantum efficiency of 23.7% is reported at the practically useful brightness value of 1000 cd/m<SUP>2</SUP>.</P><P><B>Graphic Abstract</B>
<IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-22/am505049h/production/images/medium/am-2014-05049h_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am505049h'>ACS Electronic Supporting Info</A></P>