Novel Organic Semiconductors Based on 1,5‐Naphthyridine‐2,6‐Dione Unit for Blue‐Selective Organic Phototransistor

Abstract Novel bis‐lactam based narrowband blue light absorbing organic p‐type semiconducting molecules including 3,7‐di(naphthalen‐1‐yl)‐1,5‐dioctyl‐1,5‐naphthyridine‐2,6‐dione (C8‐NTDN1) are synthesized and their phototransistor properties are investigated. Based on the excellent optical (absorption peak at 446 nm with full width at half‐maximum value of 70.7 nm) and electrical properties (field effect hole mobility of up to 0.38 cm 2 V −1 s −1 ), C8‐NTDN1 phototransistor shows decent photoresponsivity of up to 3.6 × 10 2 A W −1 , which can be further improved to 2.1 × 10 3 A W −1 by overlaying discontinuous C60 layer on top of C8‐NTDN1 thin‐film.