Light emitting device and method of fabricating the same

摘要

A light emitting device may include a first electrode on a substrate, a first emission layer on the first electrode, a buffer layer on the first emission layer, a middle electrode on the buffer layer, a second emission layer on the middle electrode, and a second electrode on the second emission layer. The buffer layer may include a material selected from the group consisting of a metal oxide, a polyelectrolyte, and a combination thereof. The first emission layer, buffer layer, middle electrode, and second emission layer may be fabricated using a wet process.

主权项

1. A light emitting device comprising:
a first electrode on a substrate; a first emission layer on the first electrode; a buffer layer on the first emission layer; a middle electrode directly disposed on the buffer layer; a second emission layer on the middle electrode; and a second electrode on the second emission layer, wherein the buffer layer includes a hole transporting polymer, wherein the middle electrode includes a conductive polymer different from the hole transporting polymer, and wherein the hole transporting polymer is represented by one of the following Chemical Formulae 1 to 3: wherein, in Chemical Formula 1, R1 and R2 are the same or different, R1 and R2 are selected from hydrogen, an alkyl, an alkenyl, an allyl, an aryl, (meth)acryl, (meth)acryloyl, and a combination thereof, and Y is a counter anion, wherein, in Chemical Formula 2, R3, R4 and R6 are the same or different, at least one of the R3, R4 and R6 groups is different from each other, the R3, R4 and R6 groups are not linked to each other, R3, R4 and R6 are selected from hydrogen, an alkyl, an alkenyl, an allyl, an aryl, (meth)acryl, (meth)acryloyl, and a combination thereof, and Y is a counter anion, wherein, in Chemical Formula 3, R7 to R8 are the same or different, R7 to R8 are not linked to each other, and R7 to R8 are selected from hydrogen, an alkyl, an alkenyl, an allyl, an aryl, (meth)acryl, (meth)acryloyl, and a combination thereof, and wherein the hole transporting polymer includes a fluorene alkyl ammonium salt, a poly(diallyldialkyl ammonium salt), a poly((meth)acryloyloxyalkyltrialkyl ammonium salt), poly((meth)acryloyloxyalkylaryldialkyl ammonium salt), poly(arylamine salt), poly(allylamine salt), poly(alkylene imine), poly((meth)acrylamide), poly(alkenyl amine), or a combination thereof.