Sakr Mahmoud E M, Kana Maram T H Abou, Elwahy Ahmed H M, Abdelwahed Mohamed S, El-Daly Samy A, Ebeid El-Zeiny M
Laser Sciences and Interactions Department, National Institute of Laser-Enhanced Sciences (NILES), Cairo University, Giza, Egypt.
Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
J Fluoresc. 2022 Jul;32(4):1509-1516. doi: 10.1007/s10895-022-02960-z. Epub 2022 May 6.
Optical and photophysical properties of 6-substituted-1,2,4-Triazine fluorescent derivative dye doped in silicate based sol-gel, homopolymer of methyl methacrylate (PMMA), and copolymer (MMA/diethylene glycol dimethacrylate) (DEGDMA) were investigated. The pores of different hosts and caging of the dye were found to effect on the parameters such as molar absorptivity, cross sections of singlet-singlet electronic absorption and emission spectra, excited state lifetime, quantum yield of fluorescence. The dipole moment of electronic transition, the length of attenuation and oscillator strength of electronic transition from So → S1 have been calculated. The dye was pumped with different powers using 3 harmonic Nd: YAG laser of 355 nm and pulse duration 8 ns, with repetition rate 10 Hz. Good photo stability for dye was attained. After 55,000 pumping pulses of (10 mJ/pulse), the photo-stabilities were decreased to 53%, 48%, and 45% of the initial ASE of dye in sol gel, PMMA, and Co-polymer respectively. The dye in sol-gel matrix showed improvement of photo stability compared with those in organic polymeric matrices.
研究了掺杂在硅酸盐基溶胶 - 凝胶、聚甲基丙烯酸甲酯（PMMA）均聚物以及共聚物（MMA / 二乙二醇二甲基丙烯酸酯）（DEGDMA）中的6 - 取代 - 1,2,4 - 三嗪荧光衍生染料的光学和光物理性质。发现不同主体的孔隙和染料的包封对诸如摩尔吸光率、单重态 - 单重态电子吸收和发射光谱的截面、激发态寿命、荧光量子产率等参数有影响。计算了电子跃迁的偶极矩、衰减长度以及从So→S1的电子跃迁的振子强度。使用波长为355 nm、脉冲持续时间为8 ns、重复频率为10 Hz的三倍频Nd:YAG激光以不同功率泵浦该染料。该染料具有良好的光稳定性。在（10 mJ / 脉冲）的55000次泵浦脉冲后，光稳定性分别降至溶胶 - 凝胶、PMMA和共聚物中染料初始受激自发辐射（ASE）的53%、48%和45%。与有机聚合物基质中的染料相比，溶胶 - 凝胶基质中的染料光稳定性有所提高。
