Blue‐to‐red electroluminescence from organic light‐emitting field‐effect transistor using various organic semiconductor materials

We succeeded in observing visible bright electroluminescence from blue to red in an organic field‐effect‐transistor structure. In particular, tetraphenylpyrene (TPPy) demonstrated a high photoluminescence efficiency of φPL ∼ 70% and a maximum electroluminescence efficiency of ηEL ∼ 10−2%. The electroluminescence efficiency (ηEL) was enhanced by using a short source‐to‐drain channel length (LSD < 1 μm). In addition, doping the TPPy layer with highly fluorescent rubrene molecules led to an #PL of ∼100% and a maximum ηEL of 0.8%.