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The orientation of facial (fac) tris‐cyclometalated iridium complexes in doped films prepared by vacuum deposition is investigated by altering the physical shape and electronic asymmetry in the molecular structure. Angle‐dependent photoluminescence spectroscopy and Fourier‐plane imaging microscopy show that the orientation of roughly spherical fac‐tris(2‐phenylpyridyl)iridium (Ir(ppy)3) is isotropic,...
A series of substituted aza‐boron‐dipyridylmethene (aD) compounds are demonstrated as fluorescent dopant emitters in blue organic light emitting diodes (OLEDs). Replacing the meso‐carbon of a dipyridylmethene dye with nitrogen to form the aD chromophore leads to a destabilization of the highest occupied molecular orbital in aD, as evidenced both from their experimentally determined photophysical and...