The deep-blue organic electroluminescent devices with the structure of ITO/Meo-TAD (20 nm)/NPB (10 nm)/DMPPP (3, 5, 10, 15 and 20 nm)/TPBi (10 nm)/Alq3 (20 nm)/LiF (0.5 nm)/Al were fabricated. The 1-(2,5-dimethyl-4-(1-pyrenyl)phenyl)-pyrene (DMPPP) blue fluorescent dye was chosen as the single light emitting layer. The effects of DMPPP layer on the luminescence performance of the devices were investigated in detail. When the DMPPP thickness was 3 nm, the color coordinates of the device were kept around (0.160, 0.099), which exhibit a very good deep blue light emission. The corresponding maximum current efficiency with the CIE coordinate of (0.163, 0.0962) and maximum luminance of the device was 0.88 cd/A and 3,605 cd/m2, respectively. When we further increased the thickness of DMPPP layer, the luminance and efficiency of the devices were improved as well. When the thickness of DMPPP layer were <10 nm, color coordinates were within the scope of deep-blue. When the thickness was 15 nm, color coordinates were in the sky-blue range at the beginning. With the increasing of voltage, color coordinates came into the deep-blue area gradually. When the thickness was 20 nm, color coordinates were outside the scope of deep-blue.
High Occupied Molecular Orbital Lower Unoccupied Molecular Orbital Lower Unoccupied Molecular Orbital Energy Color Purity Deep Blue
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This work is supported by the national natural science foundation of China under Grant (No. 50772016) and the science and technology development program of Jilin province under Grant (Nos. 20100510, 20101512, 201215221) and the “Twelfth five-year” science and technology research Project of Jilin province department of education under Grant (Nos. 2011154, 2012175, 2012176, 2013208).