【摘要】 采用对比使用掺杂系统的有机电致发光器件(OLEDs)在不同偏置电压下电致发光(EL)光谱的方法,观察了主体材料8-hydroxyquinoline aluminum(Alq3)中掺杂红色荧光染料4-(Dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4Hpyran(DCJTB)发射光谱的变化,研究了偏置电压对掺杂系统中载流子复合区域的影响。另外,通过对比采用不同主体材料的掺杂系统的电致发光(EL)和光致发光(PL)光谱,讨论了主体材料Alq3和N,N′-diphenyl-N,N′-bis(1-naphthyl)(1,1′-biphenyl)-4,4′-diamine(NPB)不同的掺杂效果。结果表明,随着偏置电压的增大,使用掺杂系统的器件中载流子复合区域逐渐向空穴传输层(HTL)移动,作为主体材料应具有高的能量传递效率,且应对染料具有低的浓度猝灭效应。更多还原

【Abstract】 Organic light emitting diodes(OLEDs) have been attracting a lot of attention because of its potential application in flat panel displays(FPD).In the past two decades since efficient double-layer OLEDs was first reported by C W Tang et al.,tremendous progress has been made in device fabrication and performance optimization,highly efficient and colorful devices have already been fabricated for commercial use.Almost all giants in display around the world,e.g.,Samsung,Sony and Philips,were involved in developing OLEDs for the next generation of FPD.Some people even estimate that OLEDs will replace liquid crystal displays(LCDs) in the next decade.However,there still remain some fundamental mechanisms of devices for scientists to deal with,such as long-term stability of organic materials or device,transportation and recombination of carriers,energy transferring process.In addition,finding a simple fabricating way to realize full-color OLEDs is also an important and imperative approach to reduce manufacturing cost in industrial production.As a promising technology for flat panel display,OLEDs have attracted a great deal of attention since 1987.During the past few years,remarkable progress has been made in the development of multicolor and full-color OLED displays.The mechanism for electroluminescent(EL) phenomenon involves in the injection of holes from anode and electrons from cathode under forward bias voltage,then the hole-electron forming the exciton,and light emission through the radiative recombination of excitons.The influence of bias voltage on the charge carrier recombination zone of doping organic light-emitting diodes(OLEDs) with the EL spectra improvement of red dopant 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran(DCJTB) doped into tris-(8-hydroxylquinoline)aluminum(Alq3) host material has been investigated,and different doping effect of host material Alq3 and N,N’-diphenyl-N,N’-bis(1-naphthyl)(1,1’-biphenyl)-4,4’-diamine(NPB) through studying the electroluminescence(EL) spectra and photoluminescence(PL) spectra was discussed.The results showed that charge carrier recombination zone moved to hole transport layer with increasing bias voltage and optimum host material should have higher energy transfer efficiency and lower charge carrier quenching property.更多还原