PVK:ACY掺杂体系的电致发光特性

 利用溶液旋涂的湿法工艺，通过改变了聚合物与荧光染料掺杂体系中poly(N-vinylcarbazole)（PVK）与7-diethylamino-3-(2-thienyl)chronmen-2-ylidene]-2,2-dicyanoviny-lamine（ACY）的比例，制备了结构为indium-tin-oxide（ITO）/PVK:ACY/tris(8-quinolinolato)aluminum（Alq₃）/Mg:Ag的有机电致发光器件，并对掺杂体系的电致发光特性进行了研究。结果表明，当复合功能层中ACY和PVK的质量比为0.7%时，器件发光亮度最高，达到了9467cd/m2；在电致发光光谱中，同时出现ACY和Alq₃的红光发射和绿光发射峰，并且随着掺杂比例的增加，器件的电致发光光谱强度出现先减小后增大的变化趋势，从材料的分子结构、空间构成、发光类型等方面讨论了其发光特性的变化。

Electroluminescent Characteristics of a Novel Red-fluorescent Dye ACY Doped PVK System

Using a doping system of PVK and ACY with various weight ratios, Organic Light-Emitting Devices (OLEDs) with a structure of Indium-Tin-Oxide (ITO)/poly(N-vinylcarbazole) (PVK):7-diethylamino-3-(2-thienyl)chronmen-2-ylidene]-2,2-dicyanoviny-lamine (ACY)/tris(8-quinolinolato) aluminum (Alq₃)/Mg:Ag by the spin coating method were fabricated. The device spectra characteristics and the distinct features of the device performance were studied, including the luminance-voltage and current density-voltage characteristics of the OLEDs. It is demonstrated that the high electroluminescent performance could be obtained by choosing a concentration proportion of PVK:ACY of 1000:7. In the EL spectra of the OLEDs, the red and green fluorescences of ACY and Alq₃ appear. The EL spectra intensity decreases initially and then increases to a maximum with the enhancement of the doping concentration. Moreover, the molecular structure, sterical hindered structural moieties are discussed and the Energy Transfer (ET) theory is used to analyze the EL spectra characteristics of ACY doped OLEDs.