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Efficient deep-red organic light-emitting diodes(OLEDs) were investigated based on the blend of poly[2- methoxy-5-(2’-ethyl-hexyloxy)-l,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.
Efficient deep-red organic light-emitting diodes (OLEDs) were investigated based on the blend of poly [2- methoxy-5- (2’-ethyl- hexyloxy) -l, 4-phenylene vinylene] , 7-bis (5- (7- (9H-carbazol-9-yl) -9,9- dioctyl-9H-fluoren-2-yl) thiophen- ] 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 VA highest external quantum efficiency of 2.56% was achieved at a blend ratio of 95: 5 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.