吡喃鎓盐新激光染料的研究

Study of Laser Dyes of Pyrylium Salt

合成了一系列吡喃鎓盐激光染料(P_1～P_8)。对它们的激光性能研究表明:新激光染料调谐范围为66～76nm,显著大于荧光素钠的文献值(29nm),与常用的优良激光染料罗丹明6G相比,激光能量转化率较接近,但调谐范围略宽,且光化学稳定性也很好。新激光染料(P_6)和香豆素4相混合后的混合染料,能够产生能量传递激光,且输出能量转化率(16.3%)高于单一染料(香豆素为12%,P_6为6.9%)。染料的Stokes位移与溶剂的参数之间满足Lippert方程,染料基态时的偶极矩小于激发态的偶极矩。所以新激光染料可用作绿光区激光染料。

A series of pyrylium salt laser dyes (P_1～P_6) were synthesized. Study of laser properties indicates that tuning ranges (66～76 nm) of new laser dyes are obviously larger than reported value (29 nm) of fluorescein sodium. Compared with Rhodamine 6 G which is an excellent and commonly used laser dye, laser energy translation efficiency of new laser dyes is almost identical but with wide tuning ranges, and good photochemical stability. The mixture of new laser dye (P_6) with coumarin 4 can produce energy transfer laser, the energy output (16.3%) is higher than either of them (Coumarin 4: 12%, P_6: 6.9%). The relations between the stokes' shifts of new laser dyes and parameter of solvent satisfy the Lippert equation, and the dipole moment of dyes in ground state is less than that in excited state. So, these new laser dyes can work suitably in the green region.