1. I overthrow the electron- hole recombination for light emission efficiency theory he borrows, and replaces it with Energy band gap. To prove it, I show valence electron levels cannot carry or transport holes. So it is Energy band gap that controls conductivity.
2. With shorter band Gap, Electron Transporting Layer can inject lots of electrons, or right amount of electrons, while Hole Transporting Layer with longer band gap and less conductivity prevents electrons from leaving, to create longer stay time of electrons on the emissive layer.
3. When people hear transport of holes, they should question the theory, because holes, absences of electrons, move according to electrons. Electrons left and fills holes.
4. The energy band gap theory can also apply to p-n LED, in addition to OLED. n is more conductor, p is more insulator.
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