Push–Pull Organic Chromophores for Frequency‐Upconverted Lasing

摘要: Properly designed organic molecules where a p-conjugated bridge is end-capped by an electron-donor and electron-withdrawing group (push‐pull chromophores) can show, under specific conditions, frequency-upconverted lasing emission. Materials based on these dyes are therefore able to convert the emission of cheap easily available infrared (IR) laser (e.g., 800 nm radiation) into more useful visible (vis) via two-photon absorption induced fluorescence phenomenon. The design molecular structure, substituent effect, modulation electronic geometric parameters be used in order optimize tune frequency conversion efficiency. Examples some best reported to-date strategies employed discussed this article.