Patent ID: 8237884
Filing Date: 2012-08-07
Classification: H01L

Abstract:
1. An organic light-emitting diode device with efficiency roll-up property, comprising: a first conductive layer; a hole injection layer, being formed on the first conductive layer; a host light-emitting layer, being formed on the hole injection layer and having a host highest occupied molecular orbital energy level (E a guest light-emitting material, being properly selected and doped in the host light-emitting layer, wherein the guest light-emitting material has a guest highest occupied molecular orbital energy level (E an electron transportation layer, being formed on the host light-emitting layer; an electron injection layer, being formed on the electron transportation layer; and a second conductive layer, being formed on the electron injection layer; wherein when a forward bias is applied to the first conductive layer and the second conductive layer, a plurality of holes may be injected into the hole injection layer from the first conductive layer, and a plurality of electrons may be injected into the electron injection layer from the second conductive layer, moreover, a potential difference produced by the forward bias making the electrons and the holes to move, and the moving electrons and the moving holes may recombine in the host light-emitting layer, such that the host light-emitting layer emits a color light; wherein when the selected guest light-emitting material is doped in the host light-emitting layer and makes the value of ∥ΔE wherein the ΔE