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.
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 submonolayer. The electroluminescence (EL) spectra and intensity of these four devices show that QAD submonolayer located at 5 nm apart from the NPB/Alq3 heterojunction interface obtained excitons from Alq3 at most through f6rster energy transfer. The comparison of the efficiency-operating voltage characteristics of the devices also indicate this result.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2005年第8期1145-1148,共4页
Acta Photonica Sinica
基金
国家自然科学(60207003)基金项目
关键词
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