Efficient double-emitting layer inverted organic light-emitting devices with different spacer layers

NIE Qu-yang; ZHANG Fang-hui

doi:doi:10.1007/s11801-017-7097-3

光电子快报（英文版）, 2017, 13 (5): 321, Published Online: Sep. 13, 2018

Efficient double-emitting layer inverted organic light-emitting devices with different spacer layers

论文大纲

NIE Qu-yang ZHANG Fang-hui ^*

Author Affiliations

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.

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NIE Qu-yang, ZHANG Fang-hui. Efficient double-emitting layer inverted organic light-emitting devices with different spacer layers[J]. 光电子快报（英文版）, 2017, 13(5): 321.

Efficient double-emitting layer inverted organic light-emitting devices with different spacer layers

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