An unconventional sunlight-induced photocatalytic method has been developed for the synthesis of deep-blue light emissive CAPs (4) via a solvent-free Kabachnik–Fields reaction under open air atmosphere. The results indicate that the synthesized bifunctional (hole-transporting and deep-blue light emitters) CAPs (4) could be promising materials for the fabrication of low cost and efficient blue-light-emitting organic optoelectronic devices.

For the first time, an unconventional sunlight-induced photocatalytic protocol for the synthesis of deep-blue light emissive carbazolyl-α-aminophosphonates (CAPs) (4) via a solvent-free Kabachnik–Fields reaction under open air atmosphere has been developed. The reaction is assumed to proceed through a single electron transfer mechanism. The prepared photocatalyst, TiO₂ nanowires has been characterized by X-ray diffraction, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy analysis. Nature-friendly reaction profile, simple to perform, use of a renewable energy source, shorter reaction times, good functional group tolerance, excellent yields (91–98%), scalability, reuse of photocatalyst, products do not need chromatographic purification, and the green chemistry metrics are close to the ideal values are the notable advantages of the present MCR strategy. Therefore, the present approach is very close to the theory of “benign by design” concept. Further, the photophysical and electrochemical behavior of CAPs (4) are examined. The results indicate that the synthesized bifunctional (hole-transporting and deep-blue light emitters) CAPs (4) could be promising materials for the construction of economical and efficient blue light-emitting organic optoelectronic devices.