Electroluminescent Properties Of Color/luminance Tunable Organic Light Emitting Diodes And Their Lifetime Enhancement With Encapsulation

摘要

In this work, color/luminance tunable organic light emitting diodes (OLEDs) (ITO glassaphthyl phenyl benzidine(NPB;80nm)/4,4'-bis(diphenylvinylenyl)-bipheny](ADS082BE:35nm)/1,3-bis[2-(2,2'-bipyridine-6-yl)-1,3,4-oxadiazo-5-yl]benzene (Bpy-OXD; 20nm)/tris-[8-hydroxy-quinoline]aluminum (Alq_3; 50 nm)/lithiurn fluoride (LiF; 3 nm)/aluminum (Al, 80 nm)) with low turn-on voltage (3 V) and high luminance (4850cd/m~2 at 9V) have been successfully manufactured. The experimental results reveal that their electroluminescent properties (e.g. hue, luminescent intensity, etc.) can be modulated by the manipulation for the layer thickness of NPB/ADS082BE/Bpy-OXD and the applied voltages. In addition, we have also demonstrated lab-made UV-curable silicone-acrylate encapsulating resin exhibits excellent gas barrier capability so that the half-lifetimes of OLEDs reach 98 h whereas those without encapsulation are only 9 h.