%0 Journal Article %A Ghoshani, Maral %A Behjat, Abbas %A Jafari, Fatemeh %A torabi, Naimeh %T Thin-film Encapsulation of Organic Light-Emitting Diodes Using Single and Multilayer Structures of MgF2, YF3 and ZnS %J International Journal of Optics and Photonics %V 7 %N 1 %U http://ijop.ir/article-1-124-en.html %R %D 2013 %K MgF2, OLEDs, Thin-film encapsulation, YF3, ZnS, %X In this research, the lifetime of green organic light emitting diodes (OLEDs) is studied using four passivation layers. To encapsulate the OLEDs, MgF2, YF3, composed of alternating MgF2/ZnS and YF3/ZnS layers were grown by thermal vacuum deposition. Measurements show that the device lifetime is significantly improved by using YF3 and ZnS as passivation layers. However, diodes encapsulated by MgF2/ZnS and YF3/ZnS nano-structures show a highly efficient gas diffusion barrier that results in a longer lifetime of the devices. The half lifetime of the green OLEDs reached 1200 minutes using YF3/ZnS layers. The electroluminescence (EL) and current-voltage characteristics of the devices were also examined to compare the electrical and the emissivity properties of the devices before and after encapsulation. This simple and inexpensive thin-film encapsulation method would be potentially employed to capsulate top emitting OLEDs and flexible OLEDs due to their good performance and easy fabrication. %> http://ijop.ir/article-1-124-en.pdf %P 11-18 %& 11 %! %9 Research %L A-10-387-4 %+ %G eng %@ 1735-8590 %[ 2013