论文部分内容阅读
利用紫外-可见光吸收光谱和荧光发射光谱,比较了共轭结构芴类小分子有机材料2,3-bis(9,9-dihexyl-9H-fluoren-2-yl)quinoxaline(Py),2,3-bis(9,9-dihexyl-9H-fluoren-2-yl)-6,7-difluoroquinoxaline(F2Py)和2,3-bis(9,9-dihexyl-9H-fluoren-2-yl)-5,6,7,8-tetrafluoroquinoxa-line(F4Py)的光谱特性;选用N,N’-Di-[(1-naphthalenyl)-N,N’-diphenyl]-(1,1’-biphenyl)-4,4’-diamine(NPB)材料作为空穴传输层,利用真空蒸镀方法制备了双层有机电致发光器件(organic light-emitting device,OLED),研究了其电致发光特性,进而讨论了增加氟助色团对芴类有机小分子光电性能的影响.结果表明,随着氟取代基的增加,材料薄膜状态的吸收谱和荧光光谱均发生了红移.器件方面,Py在5V驱动电压下发出508nm的蓝绿光,色坐标为(0.23,0.43),半峰宽为100nm;器件启动电压(定义为当亮度达到1cd/m2的驱动电压)为4.8V;在10V驱动电压下,亮度达到129cd/m2,电流密度为59mA/cm2;在5.4V电压下具有最大流明效率0.18lm/W.F2Py和F4Py在5V驱动电压下分别发出544nm的绿光和570nm的黄光,色坐标分别为(0.38,0.56)和(0.44,0.49),半峰宽分别为103和117nm;器件启动电压分别为4和2V;在10V电压下,亮度分别为557和3300cd/m2,电流密度分别为100和880mA/cm2,分别在7.6V电压下具有最大流明效率0.22lm/W和在2V电压下具有最大流明效率0.53lm/W.
The conjugated fluorene small molecule organic material 2,3-bis (9,9-dihexyl-9H-fluoren-2-yl) quinoxaline (Py) (9,9-dihexyl-9H-fluoren-2-yl) -6,7-difluoroquinoxaline (F2Py) The spectral characteristics of 6,7,8-tetrafluoroquinoxa-line (F4Py) were investigated. The results showed that N, N’-Di - [1-naphthalenyl) -N, N’-biphenyl- 4’-diamine (NPB) material as a hole transport layer, a double-layer organic light-emitting device (OLED) was prepared by a vacuum evaporation method and the electroluminescent properties thereof were studied. The effect of fluorophore on the photoelectric properties of fluorene-based organic molecules was investigated. The results showed that both the absorption and fluorescence spectra of the material were red-shifted with the increase of fluorine substituents. Emits 508nm blue-green light with a color coordinate of (0.23, 0.43) and a full width at half maximum of 100 nm. The device startup voltage (defined as the drive voltage when the luminance reaches 1 cd / m 2) is 4.8 V; at 10 V drive voltage, 129cd / m2, current density of 59mA / cm2; with a voltage of 5.4V The maximum lumen efficiency of 0.18lm / W.F2Py and F4Py at the 5V drive voltage were issued 544nm green and 570nm yellow, color coordinates were (0.38,0.56) and (0.44,0.49), half-width were 103 And 117nm respectively; the device startup voltages were 4 and 2V respectively; at 10V, the brightness was 557 and 3300cd / m2 respectively, the current densities were 100 and 880mA / cm2, respectively, with the maximum lumen efficiency of 0.22lm / W And has a maximum lumen efficiency of 0.53 lm / W at a voltage of 2V.