Citation: LI Chun, HUANG Ju, ZOU JianHua, XU Miao, ZENG WenJin. EFFICIENT DEEP-RED ORGANIC LIGHT-EMITTING DIODES BASED ON BLENDING MEH-PPV WITH A SMALL MOLECULE COMPOUND[J]. Chinese Journal of Polymer Science, ;2011, 29(5): 609-614. doi: 10.1007/s10118-011-1076-0 shu

EFFICIENT DEEP-RED ORGANIC LIGHT-EMITTING DIODES BASED ON BLENDING MEH-PPV WITH A SMALL MOLECULE COMPOUND

Received Date: 21 October 2010
Revised Date: 3 January 2011

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 61036007 and 60937001) and Ministry of Science and Technology of the People's Republic of China (Nos. 2009CB930604 and 2009CB623604).

Efficient deep-red organic light-emitting diodes (OLEDs) were investigated based on the blend of poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) with 4,7-bis(5-(7-(9H-carbazol-9-yl)-9,9-dioctyl-9H-fluoren-2-yl)thiophen-2-yl)benzo[c] [1,2,5] thiadiazole (compound 1). By optimizing the blend ratio, the turn-on voltage of the devices was significantly reduced from 4.9 V to 2.4 V. A highest external quantum efficiency of 2.56% was achieved at a blend ratio of 95:5 (wt) for compound 1: MEH-PPV. The CIE coordinate was measured to be (0.70, 0.30), with the luminescence peak at around 680 nm. Based on experimental observations the improvement mechanism is described.
- MEH-PPV,
- Organic light-emitting diodes,
- Red electroluminescence,
- Soluble small molecule
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