Emission Color Tuning and Deep Blue Dopant Materials Based on 1,6-Bis(<i>N</i>-phenyl-<i>p</i>-(<i>R</i>)-phenylamino)pyrene
2009-11-06T00:00:00Z (GMT) by
Panchromatic 1,6-bis(<i>N</i>-phenyl-<i>p</i>-(<i>R</i>)-phenylamino)pyrenes, <b>2R</b>, were obtained from Buchwald−Hartwig coupling reactions between <i>N</i>-phenyl-<i>p</i>-(<i>R</i>)-phenylamines and 1,6-dibromopyrene. The photophysical properties of <b>2R</b> corresponded well to the electron-withdrawing and -donating nature of the diarylamine substituents, exhibiting a full color visible range between 454 and 620 nm. In particular, a deep blue <b>2CN</b> showed a high radiative rate constant of 2.85 × 10<sup>8</sup> s<sup>−1</sup> with high emission quantum efficiency of 79%. Further applications of <b>2CN</b> as a blue dopant were attempted using multilayer organic light-emitting devices. A maximum efficiency of 3.98 cd/A with CIE coordinates of <i>x</i> = 0.14, <i>y</i> = 0.10 were obtained.
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