Amorphous Fluorescent Organic Emitters for Efficient Solution-Processed Pure Red Electroluminescence: Synthesis, Purification, Morphology, Solid-State Photoluminescence, and Device Characterizations

New soluble and intrinsic amorphous red emitters 1 and 2 were obtained by Suzuki coupling. Due to the close molecular polarities, separation of target products from monocoupling impurities presents a challenge. The results showed highly pure 2 would be a potentially valuable fluorophore for solution-processed pure red electroluminescence in terms of visual sensitivity with respect to 1.