沉积亚单层荧光染料提高有机发光器件的发光效率

肖步文; 李传南; 李新红; 马春生; 刘式墉

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

论文大纲

肖步文 ^1,2李传南 ¹李新红 ¹马春生 ¹刘式墉 ¹

作者单位

¹ 吉林省长春市吉林大学集成光电子学国家重点实验室,长春,130012

² 吉林省吉林市吉林华微电子股份有限公司,吉林,132023

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.

参考文献

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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.

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