A strongly electron deficient and high triplet energy host for blue emitters was developed by decorating a dibenzofuran modified biphenyl backbone structure with multiple CN units. Two hosts, 6,6′-bis(6-cyanodibenzo[b,d]furan-4-yl)-[1,1′-biphenyl]-3,3′-dicarbonitrile(CNDBF1) and 2,2′-bis(6-cyanodibenzo[b,d]furan-4-yl)-[1,1′-biphenyl]-4,4′-dicarbonitrile(CNDBF2), were derived from the CN decoration strategy for application in blue organic light-emitting diodes requiring high triplet energy host. They showed high triplet energy above 2.79 eV and acted as the electron transport type host based on the strong electron deficiency. The mixture of the CNDBF1 and CNDBF2 hosts with a hole transport type 3,3′-di(9H-carbazol-9-yl)-1,1′-biphenyl host performed as the exciplex host of a blue phosphor and accomplished high external quantum efficiency of 22.7% in the blue phosphorescent organic light-emitting diodes.

通过用多个CN单元修饰二苯并呋喃改性的联苯骨架结构，开发了一种用于蓝色发射体的强电子不足和高三重态能量主体。两个主体6,6'-双（6-氰基二苯并[b，d]呋喃-4-基）-[1,1'-联苯] -3,3'-二碳腈（CNDBF1）和2,2'-bis （6-氰基二苯并[b，d]呋喃-4-基）-[1,1'-联苯] -4,4'-二碳腈（CNDBF2）源自CN装饰策略，用于蓝色有机发光要求高三线态能量主体的二极管。它们显示出高于2.79 eV的高三重态能量，并基于强电子缺乏而充当电子传输型主体。具有空穴传输类型3,3'-二（9H-咔唑-9-基）-1,1'-联苯主体的CNDBF1和CNDBF2主体的混合物用作蓝色磷光体的激基复合物主体并完成了高外部量子效率为22。