Light-emitting element and display device

摘要

There has been a problem that difference in refractive index between an opposite substrate or a moisture barrier layer provided thereover, and air is maintained large, and light extraction efficiency is low. Further, there has been a problem that peeling or cracking due to the moisture barrier layer is easily generated, which leads to deteriorate the reliability and lifetime of a light-emitting element. A light-emitting element comprises a pixel electrode, an electroluminescent layer, a transparent electrode, a passivation film, a stress relieving layer, and a low refractive index layer, all of which are stacked sequentially. The stress relieving layer serves to prevent peeling of the passivation film. The low refractive index layer serves to reduce reflectivity of light generated in the electroluminescent layer in emitting to air. Therefore, a light-emitting element with high reliability and long lifetime and a display device using the light-emitting element can be provided.

主权项

1. A light-emitting device comprising:
a first substrate; a color filter layer over the first substrate; a first electrode over the first substrate with the color filter layer interposed therebetween, the first electrode comprising ITO; a second electrode over the first electrode; a first luminescent center pigment and a second luminescent center pigment between the first electrode and the second electrode; a first layer over the second electrode, the first layer comprising an organic material; and a second layer over the first layer, the second layer comprising a material selected from silicon nitride, silicon oxide, silicon nitride oxide, and silicon oxynitride; a third layer over the second layer, the third layer comprising Li, Ca, or Ba; and a second substrate over the third layer, wherein a light-emitting element comprising the first electrode, the second electrode, the first luminescent center pigment, and the second luminescent center pigment emits white light.