Patent ID: 8304988

Claim:
A tandem organic light emitting device, consisting: (a) an anode; (b) a cathode; (c) at least two organic light emitting diode units placed between said anode and said cathode, wherein said organic light emitting diode unit contains the following layers sequentially: a hole injection layer, a hole transporting layer, an organic light emitting layer, an electron transporting layer and an electron injection layer; and (d) at least one connecting layer, wherein each connecting layer is placed between said organic light emitting diode units and contacts with said hole injection layer of one of said organic light emitting diode units and said electron injection layer of the other one of said organic light emitting diode units directly; wherein the material of said hole injection layer and said electron injection layer is a non-doping material having both electron and hole transporting abilities; and each of said connecting layer consists of aluminum or silver.