Photo-enhanced polymer memory device based on polyimide containing spiropyran

Recent progresses of organic photonic synaptic transistors

“…Like the small organic molecules, the organic polymer materials have the characteristics of low-cost manufacturing, solution processing properties, and modification of the molecules and electrons through the synthesis procedure [95]. At the same time, compared with the small molecule materials, the organic polymers have better film-forming ability and the advantages of a high-density three-dimensional (3D) multilayer stacked structure [96]. Therefore, organic polymers are also regarded as promising materials for making OPSTs.…”

Femto/Picosecond Transient Absorption Study of Ring‐Opening Dynamics in Perimidinespirocyclohexadienone Derivatives

“…Obviously, the information obtained will determine the effective scope of application of a specific type of photochromic molecules, for instance, as structural elements of biological functions control, photo-driven molecular switches, media for optical data recording and storage. [1][2][3] The present paper discusses the mechanisms that govern the photoinduced processes in perimidinespirocyclohexadienone (spiropyrimidine) derivatives, one of the classes of spiroheterocyclic compounds revealing photo-and thermochromic properties. [4,5] Irradiation of the solution of perimidinespirocyclohexadienones Sp (R 1 = H, Alk; R 2 = t-Bu) by actinic light results in their reversible coloration due to the appearance of a longwave absorption band assigned to the ring-opened isomers Q with quinoneimine structure that was confirmed by X-ray diffraction analysis [6,7] (Scheme 1).…”

“…One of the main tasks in the development of new photochromic compounds is the establishment of mechanisms of photoinitiated processes leading to a change in their spectral properties. Obviously, the information obtained will determine the effective scope of application of a specific type of photochromic molecules, for instance, as structural elements of biological functions control, photo‐driven molecular switches, media for optical data recording and storage [1–3] …”