Light emitting element
A technology of light-emitting elements and light-emitting layers, which is applied to electrical components, semiconductor devices, circuits, etc., can solve problems such as loss and external quantum efficiency reduction, and achieve the effects of improving production capacity, improving extraction efficiency, and reducing costs
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0098] First, the relationship between the shape of the concavo-convex structure and the light extraction efficiency was simulated. Here, a general model (model) is used for the build-up part composed of the semiconductor layer or the substrate of the LED. In addition, the diffractive surface is arranged at the boundary between the substrate (refractive index 1.78) and the semiconductor layer (refractive index 2.5), and the shape of the concavo-convex structure is as follows.
[0099] L&S: Made Figure 8 In the shown line and space form, the width of the line is made 40% of the period.
[0100] Checkerboard (staggered): made Figure 7 (a) shows a triangular checkerboard shape.
[0101] grid: will Figure 5 The recesses shown in (b) are made into a square lattice shape, and the width of the line is 30% of the period.
[0102] In addition, the period and height of the concavo-convex structure were made to be the same size, and 8 types with periods varying by 0.1 μm from 0.3...
Embodiment 2
[0110] Next, when the concave-convex structure is in the shape of lines and spaces, a checkerboard (triangle), or a grid (square), the protrusions of the concave-convex structure are made of SiO 2 (Refractive index: 1.45) grid (square), the period is fixed at 0.5 μm, and the simulated height is 0.3 μm to 1.0 μm, respectively 8 kinds of different 0.1 μm. Other conditions are identical with embodiment 1. The results are shown in Table 3 and Figure 12 .
[0111] table 3
[0112]
[0113] Flat surface: light extraction efficiency 6.7
[0114] μPSS: Light extraction efficiency 16.2
[0115] From Table 3 and Figure 12 It can be seen that the convex part of the concave-convex structure is made of SiO 2 The formed lattice (square) can obtain the highest light extraction efficiency even when the height of the concavo-convex structure is any height. In addition, when the height of the concavo-convex structure is less than 0.6 μm, when the concavo-convex structure is in the s...
Embodiment 3
[0117] Next, the relationship between the inclination of the sidewall of the convex portion of the concave-convex structure with respect to the diffractive surface and the light extraction efficiency was simulated. The planar shape of the concavo-convex structure was a square lattice with a period of 0.5 μm, a height of 0.25 μm, and a width of 0.15 μm at a half of the height (0.125 μm in height). And, if Figure 13 As shown, simulations were performed for six types of concavo-convex structures in which the inclination of the sidewall of the convex part with respect to the diffractive surface was different by 5 degrees in the range of 65 degrees to 90 degrees. Other conditions are identical with embodiment 1. The results are shown in Table 4 and Figure 14 .
[0118] Table 4
[0119]
[0120] From Table 4 and Figure 14 It can be seen that the larger the angle of the concavo-convex structure, the higher the light extraction efficiency can be obtained.
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More