Patent ID: 9722210
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. An OLED light emitting device, comprising: a cathode, a light-emitting layer, an anode, a substrate, and a light extraction layer; the light-emitting layer being located between the cathode and the anode; the substrate being located between the anode and the light extraction layer; a top surface and a bottom surface of the light extraction layer being flat surfaces, and the light extraction layer at least including a first material layer and a second material layer; the first material layer being located on the substrate; the second material layer located on the first material layer; a first contact surface of the first material layer and a second contact surface of the second material layer being contacted with each other; a longitudinal section of the first contact surface and that of the second contact surface having sawtooth portions fitted with each other; and an index of refraction (n wherein the sawtooth portions comprise a plurality of isosceles triangles; and a bottom edge of each of the isosceles triangles of the first material layer coincides with a surface of the substrate; and wherein the light extraction layer further includes a third material layer; the third material layer is located on the second material layer; and an index of refraction (n