Efficient blue organic light-emitting devices with charge carrier confining nanostructure formed by wide band gap molecule doping

Abstract

We report on efficient blue organic light-emitting devices with an emission layer featuring a quasi-molecular quantum dot nanostructure as a charge carrier confining barrier, which was formed by doping a wide band gap molecule, 2-(2-hydroxyphenylbenzoxazole) lithium, into a newly synthesized blue host molecule, 9,10-bis-[4-(2,2-diphenylvinyl)-phenyl]-anthracene. The charge carrier confinement was greatly improved by doping with 10% wide band gap molecules, that led to a theoretical molecular quantum dot distance of 33 Å. The device showed enhanced efficiency () and good colour purity (x = 0.16,y = 0.15), while the projected device lifetime reached approximately 20 000 h at 150 cd m−2.

Оптические И Электрохромные Свойства Тонких Пленок Амбиполяных Полиимидов С Пендантными Группами На Основе Производных Тоиксантенона

“…Мемристорный путем изменения структуры основной цепи полимера и/или введения пендантных (боковых) групп различной природы [5,6], высокой механической устойчивости ПИ и хорошей гибкости полиимидных пленок, их совместимости с полупроводниковыми платформами [7,8], высокой термостабильности [9] и относительно легким производством трехмерных массивов на их основе [5,10,11].…”

Ambipolar Transporting 1,2‐Benzanthracene Derivative with Efficient Green Excimer Emission for Single‐Layer Organic Light‐Emitting Diodes

“…4‐(2,2‐diphenyl‐vinyl)‐phenyl group is introduced into the molecule to make the structure bulky and non‐planar for the twisted tendency of phenyl rings at the both ends of the molecule due to their steric hindrance. The non‐planarity of molecular structure can facilitate the formation of amorphous films as proved in 9,10‐bis‐[4‐(2,2‐diphenylvinyl)‐phenyl]anthracene for blue OLEDs . The resulting molecule of 7,12‐bis‐[4‐(2,2‐diphenylvinyl)‐phenyl]benzanthracene (BDPBan) show well balanced mobilities for electrons and holes above 10 −3 cm 2 /Vs.…”

Self-assembly of conducting polymer nanowires as hole injection layer for organic light-emitting diodes applications

“…Though there have been several reports on the preparation ordered nanowires structure via LB technique, there has been a lack of preparing ordered conducting polymer nanowires through LB technique , and few reports have been done on the conducting property investigation of this ordered nanowire structure. As a promising conductive polymer, poly(3,4-ethylene dioxythiophene) (PEDOT) is suitable for OLED application due to its high conductivity, environmental stability and effective injection of carries in hole transfer layers [19][20][21][22] . Some works have also been attempted to prepare PEDOT nanomaterials for OLED applications.…”