【摘要】 研究了基于红色荧光染料3-(dicyanomethylene)-5,5-dimethyl-1-(4-dimethylamino-styryl)cyclohexene(DCDDC)的白色有机电致发光器件的性能,分别制备了基于DCDDC超薄层和DCDDC掺杂主体材料的两种器件结构:1)indium-tinoxide(ITO)/N,N′-diphenyl-N,N′-bis(1-naphthyl-pheny1)-1,1′-biphenyl-4,4′-diamine(NPB)/4,4′-bis(2,2′-diphenylvinyl)-1,1′-diphenyl(DPVBi)/tris(8-quinolinolato)aluminum(Alq3)/DCDDC/Alq3/Mg:Ag;2)ITO/NPB/Alq3:DCDDC/NPB/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP)/Mg:Ag,测试了超薄层器件A和掺杂器件B的发光特性,比较了两种器件的亮度、效率曲线和光谱曲线.结果表明,两种结构的器件均实现了红绿蓝三波段白光发射,其中器件A在4V启亮,在5.5V时达到最大功率效率2.5lm/W,在18.5V时达到最大亮度16690cd/m2,色坐标稳定在(0.330,0.300)附近,在较大电压范围内仅有(-0.020,+0.002)的微小变化;器件B的启亮电压为5V,最大功率效率和最大亮度分别为1.4lm/W(9.6V)和12580cd/m2(17V),色坐标随电压增大有明显红移,当电压大于9V后色坐标稳定在白光等能点附近.我们发现两种器件的不同发光特性依赖于载流子复合区域的变化,此外,DCDDC超薄层的直接载流子俘获特性和Alq3:DCDDC体系中的不完全能量转移特性对器件性能也有一定影响.更多还原

【Abstract】 White organic light-emitting devices based on a red fluorescent dye 3-（dicyanomethylene）-5, 5-dimethyl-1-（4-dimethylamino-styryl） cyclohexene（DCDDC） were fabricated and investigated. Two kinds of devices were processed using ultrathin technology and doping technology. The structures of the devices were as followed: 1) indium-tin oxide （ITO）/N, N′-diphenyl-N, N′-bis（1-naphthyl-pheny1）-1, 1′-biphenyl-4, 4′-diamine （NPB）/4, 4′-bis（2, 2′-diphenylvinyl）-1, 1′-diphenyl （DPVBi）/tris（8-quinolinolato） aluminum （Alq₃）/DCDDC/Alq₃/Mg:Ag; 2) ITO/NPB /Alq₃:DCDDC/NPB/2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline （BCP）/Mg:Ag. The luminescence and efficiency characteristics of these two devices were measured and compared. The results showed that both devices A and B exhibited white light consisting of RGB three primary colors. Moreover, device A had a turn on voltage of 4 V, a maximum power efficiency of 2.4 lm/W at 5.5 V and a maximum luminance of 16690 cd/m2 at 18.5 V. Also, pure white emission with Commissions Internationale De L’Eclairage （CIE） coordinates near （0.330. 0.300） having a slight variation of （-0.020, +0.002） in a wide range of voltages was observed. In contrast, devices B showed a turn on voltage of 5 V, a maximum power efficiency of 1.4 lm/W at 5.5 V and a maximum luminance of 12580 cd/m2 at 17 V. The CIE coordinates had a red shift as the voltage increased and then kept near the optimum white point of （0.33, 0.33） over 9 V. It was found that the difference in characteristics of these two devices was dependent on the variation of charge recombination zone. To be specific, it was due to the direct charge trapping effect of DCDDC ultrathin layer and the properties of incomplete energy transfer in Alq₃:DCDDC doping system.更多还原