Gondek E, Całus S, Danel A, Kityk A V
Institute of Physics, Technical University of Krakow, Podhorazych 1, 30-084 Krakow, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Jan;69(1):22-6. doi: 10.1016/j.saa.2007.03.003. Epub 2007 Mar 13.
A series of methoxy (MO) and carboethoxy (CE) derivatives of 1,3-diphenyl-1H-pyrazolo[3,4-b]quinoline ([DPPQ]) are characterized by spectroscopic methods. All dyes show the photoluminescent spectra which are highly solvatochromic. In the case of 6MO[DPPQ] and 6CE[DPPQ] the emission bands are broad and shifted to the red with increasing of solvent polarity whereas the dyes 6MO1pMO[DPPQ] and 6MO13pMO[DPPQ] exhibit a reverse solvatochromism. The large difference between the excited- and state-dipole moments indicates a strong electron transfer effects in all dyes. The EL spectra are obtained for the fabricated OLEDs with a general structure of EL device ITO/PVK:6X[DPPQ]/Ca/Al. The blue emission originating from PVK host matrix appears to be quenched in EL spectra of doped PVK matrix giving rise to emission in blue, blue-green or green spectral regions. The obtained results demonstrate that a series of newly synthesized methoxy and carboethoxy [DPPQ]-derivatives may be considered as promising materials for electroluminescent applications.
通过光谱方法对一系列1,3 - 二苯基 - 1H - 吡唑并[3,4 - b]喹啉（[DPPQ]）的甲氧基（MO）和乙氧羰基（CE）衍生物进行了表征。所有染料均显示出具有高度溶剂化显色性的光致发光光谱。对于6MO[DPPQ]和6CE[DPPQ]，随着溶剂极性的增加，发射带变宽并向红色移动，而染料6MO1pMO[DPPQ]和6MO13pMO[DPPQ]则表现出相反的溶剂化显色性。激发态和基态偶极矩之间的巨大差异表明所有染料中存在强烈的电子转移效应。对于具有EL器件通用结构ITO/PVK:6X[DPPQ]/Ca/Al的制备的OLED，获得了EL光谱。源自PVK主体基质的蓝色发射在掺杂PVK基质的EL光谱中似乎被猝灭，从而在蓝色、蓝绿色或绿色光谱区域产生发射。所得结果表明，一系列新合成的甲氧基和乙氧羰基[DPPQ]衍生物可被视为有前途的电致发光应用材料。
