4 years ago

Polarized Light-Emitting Diodes Based on Patterned MoS2 Nanosheet Hole Transport Layer

Polarized Light-Emitting Diodes Based on Patterned MoS2 Nanosheet Hole Transport Layer
Soo Young Kim, Jin Seog Gwag, Ho Won Jang, Ki Chang Kwon, Kyoung Soon Choi, Quyet Van Le, Gyu Jin Choi
Here, this study successfully fabricates few-layer MoS2 nanosheets from (NH4)2MoS4 and applies them as the hole transport layer as well as the template for highly polarized organic light-emitting diodes (OLEDs). The obtained material consists of polycrystalline MoS2 nanosheets with thicknesses of 2 nm. The MoS2 nanosheets are patterned by rubbing/ion-beam treatment. The Raman spectra shows that {poly(9,9-dioctylfluorene-alt-benzothiadiazole), poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)]} (F8BT) on patterned MoS2 exhibits distinctive polarization behavior. It is discovered that patterned MoS2 not only improves the device efficiency but also changes the polarization behavior of the devices owing to the alignment of F8BT. This work demonstrates a highly efficient polarized OLED with a polarization ratio of 62.5:1 in the emission spectrum (166.7:1 at the peak intensity of 540 nm), which meets the manufacturing requirement. In addition, the use of patterned MoS2 nanosheets not only tunes the polarization of the OLEDs but also dramatically improves the device performance as compared with that of devices using untreated MoS2. Patterned MoS2 nanosheets obtained by rubbing/ion-beam treatment (RI-MoS2) can efficiently function as hole transport layers and templates for alignment of an emissive layer {poly(9,9-dioctylfluorene-alt-benzothiadiazole), poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT)} with a nematic liquid crystal phase toward highly efficient polarized organic light-emitting diodes. Interestingly, the RI-MoS2-based device exhibits an unprecedented average polarization ratio of 62.5:1 at the emitted wavelengths (166.7:1 at the peak intensity of 540 nm).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adma.201702598

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