新型可聚合激光染料及双发色团共聚物的合成

通常染料激光的工作介质是染料溶液,因而限制了在一些技术领域的应用.因此近年来人们将研究兴趣转移到固体激光染料1～3].激光染料的固体基质相对于其液体溶液存在着显著的技术优势:紧密性、可加工性、无毒、不易燃、无蒸发、易于器件集成化等等.聚合物或硅胶均可用作激光染料的固体基质,用作基质的聚合物与激光染料有很好的相容性,光均一性,且其制作成本低廉.近期报道将激光染料与甲基丙烯酸甲酯进行共聚得到了性能优良的固体激光材料4],由于激光染料与聚合物链直接相连,减少了耗能,避免了染料过快的降解,大大提高了其光稳定性和激光输出…

SYNTHESIS OF NOVEL COPOLYMERIC LASER DYES AND DICHROMOPHORIC COPOLYMER

Modified rhodamine 6G molecules (Rh\|Al)with polymerizable double bonds were copolymerized with methyl methacrylate(MMA) and 1,8\|naphthalimide derivative(N\|AE).The structures of the two monomers(Rh\|Al and N\|AE)were confirmed and characterized by 1H\|NMR and MS. The UV\|Vis absorption spectra of the copolymer indicate that there is little or no interaction between the two chromophores in their ground state. However, the fluorescence emission of N\|AE was partly quenched and the fluorescence emission of Rh\|Al was enhanced in the copolymer. While the fluorescence emissions of N\|AE and Rh\|Al both were partly quenched in the corresponding mixture. The results show that in the excited state there exists very effective intramolecular singlet\|singlet energy transfer(Intra\|SSET)channel from N\|AE to Rh\|Al in the copolymer. The experiments seem to indicate that the covalent binding of the chromophore to a polymer chain restricts its mobility and,therefore, hinders the internal micromotions of the excited groups, avoiding non\|fluorescent deactivation and thus increasing its emission efficiency and photostability.