Quantum Dot Light-Emitting Diodes for Uniform Eight-Segment Displays

Eight-segment LED displays were designed and fabricated using quantum dot light-emitting diodes. CdSe/CdS/ZnS core/shell quantum dot were employed as the emitting layer sandwiched by poly(N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine) (Poly-TPD) and an electron transport layer of ZnO nanoparticles. Each segment exhibited luminance, power efficiency and external quantum efficiency of 5380 cd/cm2, 2.63 lm/W and 1.2%, respectively. The uniformity of the eight segments was analyzed based on the current-density and luminance versus driving voltage. The good uniformity indicates that the as-designed device is useful and promising for general electroluminescent display applications.