Stimulated Emission from a TiO2 Particle-Dispersed Dye Polymer Plane Waveguide

We report the stimulated emission from a dye doped polymer plane waveguide with TiO2 particles. This waveguide consists of a poly （methylmethacrylate） （PMMA） film containing laser dye DCM as a gain medium. The emission spectrum of the film pumped by the Nd：YAG laser is different from the amplified spontaneous emission of the dye-doped film without particles. It is shown that when the excitation intensity reaches the threshold 9.6 μJ, the broad band emission spectrum narrows into multiple separate peaks with central wavelength of 608 nm. The linewidth of the sharp peak is 0.5 nm. According to our analyses, this phenomenon is due to the multiscattering of the disordered TiO2 particles inside the gain polymer film.     

基于有机染料盐掺杂薄膜体系的能量转移及光致发光特性研究

利用稳态和时间分辨瞬态光谱研究了有机盐trans-4-［p-(N-ethyl-N-(hydroxyethyl)amino)phenylstyryl］-N-(hydroxyethyl)pyridinium iodide (ASPI)掺杂聚合物PVK(聚乙烯咔唑)薄膜体系的光致发光和能量转移特性. 在ASPI：PVK掺杂薄膜体系中,PVK的荧光强度与寿命随掺杂浓度的升高而降低,表明两者存在有效的Forster能量转移. 通过在相对低浓度的掺杂体系中加入适量高量子效率的Alq3作为能量转移过渡体,形成能量转移级 关键词： 有机染料盐 荧光光谱 荧光寿命 能量转移     

外推法求高分子特性粘数中的误差分析

从数学与解析几何角度,分析了在外推Huggins与Kraemer方程求高分子特性粘数时,出现误差的原因,并半定量得出了误差范围,同时确证了最佳测试的浓度范围为10^-3g／cm^3数量级。     

Amplified Spontaneous Emission of Organic Pyridinium Dye doped Polymeric Waveguide

An organic dye salt trans-4-[p-（N-hydroxyethyl-N-methylamino）styryl]-N-methylpyridinium iodide （ASPI） is doped with an electron transport organic molecule tris（8-hydroxyquinoline） aluminium （Alq3） in a host matrix of poly（methylmethacrylate） （PMMA）, and the amplified spontaneous emission （ASE） is studied. By efficient Forster energy transfer from Alq3 to ASPI, it is demonstrated that the ASE threshold of ASPI：Alq3：PMMA waveguide （about 11 μJ/pulse） is much lower than that of ASPI：PMMA system （about 38 μJ/pulse）. Meanwhile, the peak position of ASE can be controlled by the effect of film thickness on waveguide modes. We show that the ASE peak position can be tuned over 37nm. These characteristics indicate the ASPI：Alq3 system as a promising gain medium for optical amplifiers and organic semiconductor lasers.