Organic electroluminescent element
View Patent ↗In an organic electroluminescent element, light extraction efficiency is enhanced. An organic electroluminescent element 1 is configured by laminating a substrate 2 , a first electrode 3 , an organic layer 4 , and a second electrode 5 in this order. The organic layer 4 includes an emitting layer 43 , and the emitting layer 43 is formed by mixing porous particles 45 into an emitting material 44.
1. An organic electroluminescent element that is configured by laminating a substrate, a first electrode, an organic layer including an emitting layer, and a second electrode in this order, wherein
the emitting layer is formed by mixing a porous particle in an emitting material,
the porous particle is a porous silica particle comprising a mesoporous silica particle, and
the emitting layer is formed so that the porous particle is uniformly dispersed within the emitting material of the emitting layer.
2. The organic electroluminescent element according to claim 1 , wherein a refractive index of the emitting layer is lower than 1.6.
3. The organic electroluminescent element according to claim 1 , wherein plural mesopores, each of which has a pore diameter of 2 nm or more, are arranged at regular intervals inside the mesoporous silica particle.
4. The organic electroluminescent element according to claim 1 , wherein a chain hydrocarbon structure is provided on a surface of the mesoporous silica particle.
5. The organic electroluminescent element according to claim 1 , wherein an organic functional group having a π conjugated bond is provided on a surface of the mesoporous silica particle.
6. The organic electroluminescent element according to claim 1 , wherein a particle diameter of the porous particle is 10 to 100 nm.
7. The organic electroluminescent element according to claim 1 , wherein the emitting material is a coating-type material.
8. The organic electroluminescent element according to claim 1 , wherein the porous particle has a same functional group as an organic functional group included in the emitting material.
9. The organic electroluminescent element according to claim 1 , wherein the mesoporous silica particle is produced by a manufacturing method comprising:
generating a surfactant complex silica particle by making silicon alkoxide hydrolyze by using a base catalyst in a liquid phase including surfactant, water, and hydrophobic portion-containing additive; and
generating a mesoporous silica particle having an organic functional group provided on a surface of the mesoporous silica particle by extracting surfactant and hydrophobic portion-containing additive from the surfactant complex silica particle by using acid, alcohol, and siloxane having the organic function group.
10. The organic electroluminescent element according to claim 9 , wherein the silicon alkoxide comprises an organic functional group-containing silicon alkoxide.