Patent ID: 8803853

Claim:
A light-emitting device comprising: a plurality of light-emitting elements each exhibiting a different emission color; wherein at least one of the light-emitting elements comprises n light-emitting layers (n≧2, n is a natural number) between a pair of electrodes, wherein each of the n light-emitting layers comprises a light-emitting substance, wherein the light-emitting substances each exhibit different emission colors, wherein between a m-th light-emitting layer (m is a natural number) and a (m+1)-th light-emitting layer, a first mixed layer and a second mixed layer are provided, wherein the first mixed layer comprises a first substance and a second substance, wherein the first substance comprises a substance having a higher mobility of electrons than that of holes or a bipolar substance, wherein the second substance has an electron-donating property to the first substance, and wherein the second mixed layer comprises an organic matter and a metal oxide comprising molybdenum or ruthenium.