CAJ | 학술논문

金属Yb兼具功函数低、透光度高和化学稳定性相对较高等优点,非常适合作为有机顶部发光器件（TEOLED）的透明阴极材料。计算表明：TEOLED阴极层中加入金属Yb可以有效地抑制器件工作过程中产生的表面等离子体激元振荡（SPs）,从而提高器件的相关性能。本文比较性地研究了两种阴极层不同（Yb/Yb：Au和Yb/Yb：Ag）、结构相同（ITO/NPB/Alq3/阴极）的TEOLED。结果表明,直接利用Yb：Au或Yb：Ag共沉积层作为透明阴极的TEOLED的透光度很高,但其电子注入能力较差、发光效率较低;而在Yb：Ag（或Yb：Au）共沉积层和Alq3层之间插入厚度适当的Yb层后,虽然透光度略有下降,但其发光效率得到了显著的提高。
금속Yb겸구공함수저、투광도고화화학은정성상대교고등우점,비상괄합작위유궤정부발광기건（TEOLED）적투명음겁재료。계산표명：TEOLED음겁층중가입금속Yb가이유효지억제기건공작과정중산생적표면등리자체격원진탕（SPs）,종이제고기건적상관성능。본문비교성지연구료량충음겁층불동（Yb/Yb：Au화Yb/Yb：Ag）、결구상동（ITO/NPB/Alq3/음겁）적TEOLED。결과표명,직접이용Yb：Au혹Yb：Ag공침적층작위투명음겁적TEOLED적투광도흔고,단기전자주입능력교차、발광효솔교저;이재Yb：Ag（혹Yb：Au）공침적층화Alq3층지간삽입후도괄당적Yb층후,수연투광도략유하강,단기발광효솔득도료현저적제고。
The properties of rare earth element Yb, such as low work function, high optical transmittance and rel- ative chemical stability make this metal very suitable to be used as transparent cathode materials for top - emitting organic light emitting devices （TEOLEDs）. Our calculation also demonstrates that introducing this material into TEOLED will reduce the affect of the surface plasmons （SPs） during operation and hence improve the perform- ance of the device. In this paper, we have comparatively studied two types of Yb - based cathode, Yb/Yb ： Au and Yb/Yb ： Ag, for the TEOLEDs with a structure of ITO/NPB/Alq3/cathode. The Yb ： Au or Yb ： Ag co - va- porization layer deposited directly on the Alq3 as cathode exhibits very high transmittance but poor electron injec- tion. Inserting a thin Yb layer with suitable thickness between the Yb：Ag （or Yb：Au） and Alq3 layers will sig- nificandy improve the light emitting efficiency of the TEOLED, though slightly reduce the transmittance of the cathode.