Shang Hui, Shimotani Hidekazu, Kanagasekaran Thangavel, Tanigaki Katsumi
Department of Physics , Tohoku University , 6-3, Aramaki Aza-Aoba , Aoba-ku, Sendai 980-8578 , Japan.
Advanced Institute for Materials Research (AIMR) , Tohoku University , 2-2-1 Katahira , Aoba-ku, Sendai 980-8577 , Japan.
ACS Appl Mater Interfaces. 2019 Jun 5;11(22):20200-20204. doi: 10.1021/acsami.9b02298. Epub 2019 May 24.
To develop high-performance organic light-emitting organic field-effect transistors (LE-OFETs), a fundamental problem in organic semiconductors is to compromise light luminescent efficiency for high carrier mobility and vice versa. Therefore, LE-OFETs can avoid this problem by separating the light-emission and carrier-transport functions. Here, a bilayer LE-OFET composed of a tetracene crystal as a carrier transporter (bottom crystal) and a 4-(dicyanomethylene)-2-methyl-6-( p-dimethylaminostyryl)-4 H-pyran (DCM1)-doped tetracene crystal as a light emitter (top crystal) was fabricated. Red light-emission color, which is distinct from the green emission color of tetracene, was detected in the top crystal. Light emission from the top layer was prohibited when an insulating thin film was inserted between the two crystals. These observations indicate that excitons are formed in the bottom crystal and transferred to the top crystal, emitting reddish light. Bilayer LE-OFETs have the advantage of providing both high current density and a bright emission for high-performance light-emitting FETs.
为了开发高性能有机发光有机场效应晶体管（LE-OFET），有机半导体中的一个基本问题是在高载流子迁移率和发光效率之间做出权衡，反之亦然。因此，LE-OFET可以通过分离发光和载流子传输功能来避免这个问题。在此，制备了一种双层LE-OFET，其由作为载流子传输体的并四苯晶体（底部晶体）和作为发光体的4-（二氰基亚甲基）-2-甲基-6-（对二甲氨基苯乙烯基）-4H-吡喃（DCM1）掺杂的并四苯晶体（顶部晶体）组成。在顶部晶体中检测到了与并四苯的绿色发射颜色不同的红色发光颜色。当在两个晶体之间插入绝缘薄膜时，顶层的发光被禁止。这些观察结果表明，激子在底部晶体中形成并转移到顶部晶体，发出微红的光。双层LE-OFET具有为高性能发光场效应晶体管提供高电流密度和明亮发射的优点。
