光子学报, 2005, 34 (8): 1145, 网络出版: 2006-06-12
沉积亚单层荧光染料提高有机发光器件的发光效率
Improving the Efficiency of Organic Light-Emitting Devices with a Quinacridone Sub-Monolayer
有机发光器件 亚单层 奎丫啶酮 激子 能量转移 Organic light-emitting devices Sub-monolayer Quinacridone Exciton Energy transfer
摘要
结合掺杂薄层作为发光探针层的方法和亚单层(sub-monolayer)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(60 nm)/ Alq3(x nm)/QAD(0.05 nm)/Alq3[(60-x) nm]/LiF/Al(其中x=0,2.5,5,7.5 nm).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=5 nm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.
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)/Alq_3(x nm)/QAD(0.05 nm)/Alq_3[(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/Alq_3 heterojunction interface obtained excitons from Alq_3 at most through frster energy transfer.The comparison of the efficiency-operating voltage characteristics of the devices also indicate this result.
肖步文, 李传南, 李新红, 马春生, 刘式墉. 沉积亚单层荧光染料提高有机发光器件的发光效率[J]. 光子学报, 2005, 34(8): 1145. 肖步文, 李传南, 李新红, 马春生, 刘式墉. Improving the Efficiency of Organic Light-Emitting Devices with a Quinacridone Sub-Monolayer[J]. ACTA PHOTONICA SINICA, 2005, 34(8): 1145.