【摘要】 结合掺杂薄层作为发光探针层的方法和亚单层(submonolayer)有机发光技术,利用沉积在有机发光器件发光层中的亚单层奎丫啶酮(Quinacridone,QAD)分子作为探针,同时改变QAD层的位置,对有机发光器件中激子的形成与扩散进行了研究,器件结构为ITO/NPB(60nm)/Alq3(xnm)/QAD(0.05nm)/Alq3[(60-x)nm]/LiF/Al(其中x=0,2.5,5,7.5nm).通过对各器件不同条件下的电致发光谱、发光强度和发光效率的对比研究,得到在x=5nm处引入亚单层QAD可以使QAD分子通过能量转移而获得的激子数量最多,进而可以实现高效率的发光.更多还原

【Abstract】 A Quinacridone（QAD） sub-monolayer was inserted in the Electron transporting layer of Organic Light-emitting Devices（OLEDs）,which was used as a probe for excitons′ formation and diffusion.Tthe devices configuration are ITO/NPB（60 nm）/Alq₃（x nm）/QAD（0.05 nm）/Alq₃[（60-x）nm]/ LiF（0.4 nm）/Al（180 nm）,of which x=0, 2.5, 5, 7.5 nm is the different position of deposited QAD sub-monolayer. The electroluminescence （EL） spectra and intensity of these four devices show that QAD sub-monolayer located at 5 nm apart from the NPB/Alq₃ heterojunction interface obtained excitons from Alq₃ at most through frster energy transfer.The comparison of the efficiency-operating voltage characteristics of the devices also indicate this result.更多还原