Tailored Diketopyrrolopyrrole Derivatives for Efficient Deep‐Red Organic Lasers

ABSTRACT

Deep‐red emitting waveguide‐based lasers are gaining increasing attention for integrated photonic and telecommunication technologies. Here, we report three diketopyrrolopyrrole derivatives ( DPP1 , DPP2 , DPP3 ) functionalized with different electron‐donating groups (triphenylamine, methoxytriphenylamine, and phenylphenoxazine, respectively), showing efficient performance as active materials for waveguide‐based lasers. When the compounds are dispersed in polystyrene films and excited at their green absorption bands, amplified spontaneous emission (ASE) appears at 715, 730, and 703nm for DPP1 , DPP2 , and DPP3 , respectively, with remarkable photostability (> 10 ⁵ pump pulses) under intense excitation. Ultrafast transient absorption spectroscopy was used to investigate the photophysics of these compounds, particularly the dual ASE observed in DPP1 (674 and 713 nm) and DPP2 (688 and 725 nm), when excitation is performed at 355 nm. Distributed‐feedback lasers based on top‐layer dichromated gelatin resonators with engraved 1D or 2D relief gratings were fabricated and tuned for single or dual emission. Overall, rational molecular design, extended π‐conjugation, and high photostability pave the way for deep‐red photonic materials and wavelength‐tunable organic lasers.