(a) and efficiency-luminance (b) characteristics of two OLEDs with structures of ITO/CuPc 5 nm/NPB 75 nm/ 60 nm/Mg:Ag (filled squares) and ITO/PTCDA:CuPc 10 nm/NPB 70 nm/ 60 nm/Mg:Ag (open circles), respectively.
Maximum current efficiency and driving voltage vs PTCDA:CuPc thickness (a), plots of power efficiency as a function of current density (b), and the EL spectra (c) for OLEDs with a structure of ITO/PTCDA:CuPc /NPB / 60 nm/Mg:Ag, where PTCDA:CuPc thicknesses are 5, 10, 20, and 30 nm, respectively.
XRD patterns (a) and absorption spectra (b) for 100 nm CuPc, PTCDA and 1:2 PTCDA:CuPc (by weight ratio) films deposited on quartz glasses.
(a) and efficiency-current density (b) for OLEDs with a structure of ITO/NPB spacer /PTCDA:CuPc 10 nm/NPB / 60 nm/Mg:Ag, where NPB spacer thicknesses are 0 nm (open circles), 10 nm (filled circles), 20 nm (upward triangles), and 30 nm (downward triangles), respectively.
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