Light emitting device and electronic device
A light emitting device includes a light emitting element that includes a reflection layer formed on a substrate, a light emitting layer formed on the reflection layer, and a semi-reflection layer formed on the light emitting layer, so as to transmit a portion of light from the light emitting layer and to reflect a remaining portion of the light. The light emitting element is configured as an optical resonator that causes a portion of the light outputted from the light emitting layer travelling at a predetermined angle θ, larger than 0 degrees with respect to a direction perpendicular to the reflection layer, to resonate between the reflection layer and the semi-reflection layer and extracts the light from the side of the semi-reflection layer.
1. A light emitting device, comprising:
a light emitting element that includes:
a reflection layer formed above a substrate,
a light emitting layer formed above the reflection layer, and
a semi-reflection layer formed above the light emitting, layer, so as to transmit a portion of light from the light emitting layer and to reflect a remaining portion of the light,
wherein the light emitting element is configured as an optical resonator that causes a portion of the light outputted by the light emitting layer travelling at a predetermined angle θ, larger than 0 degrees with respect to a direction perpendicular to the reflection layer, to resonate between the reflection layer and the semi-reflection layer and extracts the light from the side of the semi-reflection layer.
2. The light emitting device according to claim 1 ,
wherein an optical distance L between the reflection layer and the semi-reflection layer is determined in accordance with the following equation, in which λ represents a wavelength of the light emitted from the light emitting layer:
2 L/cos θ= m ×λ ( m is a natural number).
3. The light emitting device according to claim 1 ,
wherein the angle θ is set such that the light travelling toward the semi-reflection layer at the angle θ can be prevented from being totally reflected by the semi-reflection layer.
4. The light emitting device according to claim 1 ,
wherein a plurality of light emitting elements that respectively emit different colors constitute a group, and a plurality of such groups are arranged on the substrate;
the light emitting device further comprising:
a plurality of color filters each disposed so as to correspond to each of the plurality of light emitting elements on a one-to-one basis, and to receive the resonant light from the corresponding light emitting element.
5. The light emitting device according to claim 1 , further comprising:
a transparent conductive layer provided between the light emitting layer and the reflection layer so as to serve as an electrode of the light emitting element;
wherein the semi-reflection layer serves as the other electrode of the light emitting element.
6. The light emitting device according to claim 1 , further comprising:
a transparent conductive layer provided between the light emitting layer and the reflection layer so as to serve as an electrode of the light emitting element; and
a light-transmissive insulation layer provided between the transparent conductive layer and the reflection layer;
wherein the semi-reflection layer serves as the other electrode of the light emitting element.
7. An electronic device comprising the light emitting device according to claim 1 .
8. An electronic device comprising the light emitting device according to claim 2 .
9. An electronic device comprising the light emitting device according to claim 3 .
10. An electronic device comprising the light emitting device according to claim 4 .
11. An electronic device comprising the light emitting device according to claim 5 .
12. An electronic device comprising the light emitting device according to claim 6 .