Improved characteristics of polymer light-emitting diode based on poly(alkylfluorene) with functional layer fabricated by contact printing method

India-Japan Expert Group Meeting on Biomolecular Electronics & Organic Nanotechnology for Environment Preservation

物理学;生物科学;生态环境科学

Kajii, H.^1 ; Mizuno, K.^1 ; Ohmori, Y.^1

Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka

565-0871, Japan^1

关键词: Electron transport layers;    Electron transport materials;    Heterostructure devices;    Hole transport materials;    Multilayer structures;    Poly(9 ,9-dioctylfluorene) (F8);    Polymer light emitting device;    Polymer light emitting diode;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/704/1/012018/pdf
DOI  :  10.1088/1742-6596/704/1/012018

来源: IOP

【 摘 要 】

In the organic light-emitting diode, the multilayer structure is useful to achieve the effective carrier injection and transport, and improve the emission efficiency. The characteristics of the polymer light-emitting device with a functional layer by contact printing method are investigated. Hole transport material, the guest and electron transport material are mixed at each layer with the same host. Poly (9,9-dioctylfluorene) (F8) and Tris[1-phenylisoquinolinato-C2,N]iridium(III) (Ir(piq)3) are used as the host and guest materials. We focused on the effects of a functional layer with 1,3,5-Tris (1-phenyl-1H-benzimidazol-2-yl)benzene(TPBi) as the electron transport material doped in F8. For a non-heterostructure device with F8:TPBi functional layer, electrons are injected from the cathode interface to TPBi and transported through F8. TPBi acts as the effective hole blocking and electron transport layer as TPBi is mixed in F8 at the cathode side. Non-heterostructure device exhibits improved emission efficiency and lower driving voltage.