NIE Qu-yang,ZHANG Fang-hui.Efficient double-emitting layer inverted organic light-emitting devices with different spacer layers[J].Optoelectronics Letters,2017,13(5):321-324 Efficient double-emitting layer inverted organic light-emitting devices with different spacer layers Author Name Affiliation NIE Qu-yang  College of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China  ZHANG Fang-hui  College of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China  Abstract:       Double-emitting layer inverted organic light-emitting devices (IOLEDs) with different spacer layers were investigated, where 2,20,7,70-tetrakis(carbazol-9-yl)-9,9-spirobifluorene (CBP), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen) and 4,40,400-tris(N-carbazolyl)-triphenylamine (TCTA) were used as spacer layers, respectively, and GIr1 and R-4b were used as green and red guest phosphorescent materials, respectively. The results show that the device with BCP spacer layer has the best performance. The maximum current efficiency of the BCP spacer layer device reaches up to 24.15 cd.A-1 when the current density is 3.99 mA.cm-2, which is 1.23 times bigger than that of the CBP spacer layer device. The performance is better than that of corresponding conventional device observably. The color coordinate of the device with BCP spacer layer only changes from (0.625 1, 0.368 0) to (0.599 5, 0.392 8) when the driving voltage increases from 6 V to 10 V, so it shows good stability in color coordinate, which is due to the adoption of the co-doping evaporation method for cladding luminous layer and the effective restriction of spacer layer to carriers in emitting layer. Hits: 4113 Download times: 0 View Full Text    Download reader