Patent ID: 8704212

Claim:
A light-emitting device comprising: a first insulating layer over a substrate, the first insulating layer comprising silicon nitride; a second insulating layer over the first insulating layer, the second insulating layer comprising silicon oxide; a crystalline silicon film over the second insulating layer; a gate insulating layer over the crystalline silicon film; a gate electrode over the gate insulating layer, the gate electrode overlapping the crystalline silicon film; a third insulating layer over the gate electrode; a wiring over the third insulating layer; a fourth insulating layer over the wiring; a light-emitting element over the fourth insulating layer, the light-emitting element comprising an anode comprising ITO and a film of silver, a cathode over the anode and a layer comprising an organic compound between the anode and the cathode; and a fifth insulating layer having an opening overlapping the anode, the fifth insulating layer overlapping an end portion of the anode, wherein the layer comprising the organic compound comprises a material having molecular weight 678, wherein the material having molecular weight 678 consists of a first part of molecular weight 510 and a second part of molecular weight 168, and wherein the first part is combined with the second part by a single bond.