Abstract
The authors found an interesting and strange phenomenon that is inexplicable using a simple energy diagram. Blue-emitting Alq (BAlq), a hole-blocking material, exhibits an excellent hole-blocking property in an organic light-emitting diode (LED) consisting of naphthyl-substituted diamime derivative (NPD) and BAlq. Nevertheless, its hole-blocking property is lost by inserting Alq3 between BAlq and a cathode. This fact suggests that an indirect interaction is imparted to the NPD/BAlq interface from a detached (not neighboring) layer. In addition, difference electroluminescence (EL) spectrum analysis is very effective in the discussion of EL mechanism.
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