Highly efficient blue organic light-emitting diodes using dual emissive layers with host-dopant system

Abstract

Abstract. We fabricated highly efficient blue organic light-emitting diodes (OLEDs) by designing differing emitting layer structures with fluorescent host and dopant materials of 4,4-bis (2,2-diphenylyinyl)-1,10-biphenyl and 9,10-bis (2-naphthyl) anthracene as host materials and 4,4'-bis (9-ethyl-3-carbazovinylene)-1,1'biphenyl (BCzVBi) as a dopant material to demonstrate electrical and optical improvements. Best enhancement in luminance and luminous efficiency were achieved by a quantum well structure in device F with 8668 cd∕m 2 at 8 V and 5.16 cd∕A at 103.20 mA∕cm 2 , respectively. Among the blue OLED devices doped by BCzVBi, device B emits the deepest blue emission with Commission Internationale de l'É clairage coordinates of (0.157, 0.117) at 8 V. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

An Optically Programmable Surface Realized With Azobenzene-Functionalized Lotus Leaf and OLEDs

“…This functionalization is achieved by a silane attachment with its modification to an azide-terminated monolayer and mounting azobenzene molecules by a 1,3dipolar cycloaddition known as "click reaction [15]." The produced surfaces are highly transparent and are switched with a UV LED and a blue OLED with 4,4'-Bis(9-ethyl-3carbazovinylene)-1,1'-biphenyl (BCzVBi) as emitters [16], [17]. Additionally, a spatially resolved study of the switching properties of the naturally inhomogeneous azobenzenefunctionalized artificial lotus leaf is presented.…”