Effect of metal salts in the optical properties of polydiacetylenes
Effect of metal salts in the optical properties of polydiacetylenes
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DOI：
10.1016/j.jlumin.2008.01.013
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发表时间：
2008-09
影响因子：
3.6
通讯作者：
J. A. Díaz‐Ponce;O. Morales–Saavedra;M. F. Beristaín-Manterola;J. Hernández-Alcántara;T. Ogawa
中科院分区：
文献类型：
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作者：
J. A. Díaz‐Ponce;O. Morales–Saavedra;M. F. Beristaín-Manterola;J. Hernández-Alcántara;T. Ogawa
制备了含锌、Eu、Gd金属盐的聚二乙炔(PDA)聚酯薄膜。紫外-可见(UV-Vis)吸收光谱和光致发光(PL)光谱表明，金属盐的存在使它们的最大值分别向更高和更低的能量方向移动。共轭体系中酯基团位于共轭体系中的PDAS薄膜呈现两个发射带。较高的能量发射带对应于羰基发射，较低的能量发射带对应于自捕获激子(STE)。事实上，金属盐的加入增加了较高和较低发射能带之间的强度关系。另一方面，在由戊二烯-1-醇衍生的PDA薄膜中进行的拉曼光谱测量表明，金属盐诱导了三键和双键信号向更高能量的轻微统计移动。通过拉曼光谱、紫外可见光谱和荧光光谱检测到的强度变化和谱带移动表明，金属盐的存在会对这些PDA的能级产生显著的影响。为了验证这一结论以及这些材料的三次非线性光学性能，进行了非线性光学(NLO)三次谐波(THG)测量。
Films of polydiacetylene (PDA)-containing polyesters with metal salts of Zn, Eu and Gd were prepared. Ultraviolet–visible (UV–VIS) absorption and photoluminescent (PL) spectra indicated that the presence of the metal salts induced a small shift of their maxima to higher and lower energies, respectively. PDAs films with an ester group in allylic position to the conjugated system presented two emission bands. The higher energy emission band was assigned to carbonyl emission and the lower energy emission band to self-trapped excitons (STE). Indeed, the inclusion of metal salts incremented the intensity relation between the higher and lower emission energy bands. On the other hand, Raman spectroscopy measurements performed in PDAs films derived of pentyn-1-ol indicated that the metal salts induced a slight statistical shift in the triple and double bond signals to higher energies. In this way, the intensity variations and band shifts detected by Raman, UV–VIS and PL spectroscopies showed that the presence of metal salts could have a remarkable influence on the energy levels of these PDAs. Nonlinear optical (NLO) third harmonic generation (THG) measurements were performed in order to verify this affirmation as well as the cubic NLO performance of these materials.