芴类荧光染料掺杂DNA-CTMA薄膜的放大自发辐射特性

钯催化Suzuki反应合成得到一种9,9-二乙基-2,7-二-(4-吡啶)芴（DPFP）荧光染料,研究了该染料的吸收和荧光光学特性,以及DPFP掺杂DNA-CTMA薄膜的荧光光谱特性和放大自发辐射特性。实验结果表明:DPFP的吸收峰位于333 nm，DPFP的荧光光谱在370 nm和386 nm出现荧光峰，在408 nm出现肩峰，存在从激发态S1能级到基态S0能级的S10-S00，S10-S01和S10-S02三种振动带的电子跃迁;同时，在Nd:YAG纳秒激光器355 nm输出光的泵浦下，DPFP掺杂DNA-CTMA薄膜在波长390 nm和406 nm处实现了放大自发辐射，其阈值能量密度分别为3.24和3.40 mJ/cm2;此外，通过调节DPFP掺杂DNA-CTMA的质量比可以实现特定波长的放大自发辐射。

Amplified spontaneous emission of fluorene fluorescent-dye-doped DNA-CTMA thin films

The 4-(9, 9-diethyl-2-(pyridin-4-yl)-9H-fluoren-7-yl) pyridine (DPFP) was synthesized via a Suzuki coupling reaction. The optical spectra properties of DPFP and DPFP-DNA-CTMA thin films were characterized by the measurements of the UV/VIS absorption spectrum and fluorescence spectrum. The amplified spontaneous emission (ASE) of the DPFP-DNA-CTMA thin film was studied experimentally by pumping of pulse laser with a wavelength of 355 nm. The result shows that the absorption peak is located at 333 nm and the fluorescence peaks of DPFP are 370 nm, 386 nm, 408 nm. The fluorescence spectrum of DPFP has the multi-peaks which are corresponding to the vibronic transitions from an excited state of S1 level to the ground state of S0 level. The ASE peaks of DPFP-DNA-CTMA thin films are located at 390 nm and 406 nm, and the threshold energy densities are 3.24 mJ/cm2 and 3.4 mJ/cm2, respectively. By adjusting the doped proportion of DPFP in DNA-CTMA, ASE can be realized at a specific wavelength.