Light scattering layer having particles for an organic EL light-emitting device
An organic EL light-emitting device including: a light-emitting layer capable of generating light; a first light-scattering layer containing first light-scattering particles having an average particle diameter of 0.1 μm to 1 μm; and prisms in a streak array pattern. The light emitting layer, the first light-scattering layer and the prisms are disposed in this order, and a mean free path L 1 of light scattering in the first light-scattering layer and a thickness D 1 of the first light-scattering layer satisfy D 1 /L 1 <6.
1. An organic EL light-emitting device comprising:
a light-emitting layer capable of generating light;
a first light-scattering layer containing first light-scattering particles having an average particle diameter of 0.1 μm to 1 μm; and
prisms in a streak array pattern,
the light emitting layer, the first light-scattering layer and the prisms being disposed in this order, wherein
a mean free path L 1 of light scattering in the first light-scattering layer and a thickness D 1 of the first light-scattering layer satisfy D 1 /L 1 <6.
2. The organic EL light-emitting device according to claim 1 , wherein the prisms have an apex angle of 80° or smaller.
3. The organic EL light-emitting device according to claim 1 , wherein the first light-scattering layer contains a first binder.
4. The organic EL light-emitting device according to claim 3 , wherein the first binder has a refractive index of 1.5 or more.
5. The organic EL light-emitting device according to claim 3 , wherein the first binder contains high refractive index nanoparticles.
6. The organic EL light-emitting device according to claim 5 , wherein the high refractive index nanoparticles are contained in a ratio of 20% by weight or more and 80% by weight or less relative to a total amount of the first binder.
7. The organic EL light-emitting device according to claim 1 , wherein a ratio of the first light-scattering particles in the first light-scattering layer is 0.5% by weight or more and 40% by weight or less.
8. The organic EL light-emitting device according to claim 1 , comprising, between the prisms and the light-emitting layer, a second light-scattering layer capable of scattering the light.
9. The organic EL light-emitting device according to claim 8 , wherein the second light-scattering layer is provided between the light-emitting layer and the first light-scattering layer.
10. The organic EL light-emitting device according to claim 1 , wherein the first light-scattering layer has adhesiveness.