Vertical Light-Emitting Device with Reflective Members
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Three-dimensional light-emitting devices experience reduced luminous efficiency due to high light absorption by light-absorbing members, as light emitted in a lateral direction travels through a long optical path, while light emitted upward or downward is absorbed less due to a shorter path.
Innovation Solution
The implementation of vertical light-emitting structures with a core-shell structure and reflective members between them, where the reflective members have a lower refractive index than the light-absorbing member, to reflect light emitted in a lateral direction and minimize its transmission through the absorbing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a 3D light-emitting device with increased light-emitting area is used, then the luminous efficiency should increase, but the luminous efficiency does not increase proportionally because light emitted in lateral direction is absorbed by light-absorbing members
Solution Approach 1:
A reflective member is introduced as an intermediary element between the vertical light-emitting structures and the light-absorbing member. This reflective member intercepts light emitted in the lateral direction and redirects it, preventing direct absorption by the light-absorbing member while maintaining the 3D structure's light-emitting area
Solution Approach 2:
The patent redirects lateral-emitted light (horizontal dimension) toward vertical directions by using the reflective member. This dimensional redirection changes the light propagation path from lateral to vertical, reducing the optical path length through the light-absorbing member
2Length of moving object
If light is emitted in lateral direction in a 3D light-emitting device, then the light travels through a long optical path, but this results in high light absorption by light-absorbing members
Solution Approach 1:
Instead of allowing light to propagate laterally through the long optical path, the reflective member inverts the propagation direction by reflecting lateral light toward vertical directions. This shortens the effective optical path length through the light-absorbing member and reduces energy loss
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly reduces the number of times light is transmitted through the light-absorbing member, thereby enhancing the luminous efficiency of the light-emitting device by reflecting lateral light emissions upward or downward.
Implementation Method 1
Reflective members are disposed between the vertical light-emitting structures and reflect light that is emitted in a lateral direction of the vertical light-emitting structures
Implementation Method 2
A semiconductor light-emitting device such as a light-emitting diode (LED) or a laser diode (LD) uses an electroluminescence phenomenon whereby light is emitted from a material (semiconductor) by supplying current or applying voltage
Data Source
AI summary
The present application relates to a light-emitting device and method of manufacturing the same. The device includes a lower portion, and vertical light-emitting structures disposed on the lower portion. A conductive member partially surrounds the vertical light-emitting structures, and reflective members are disposed between the vertical light-emitting structures. The reflective members reflect light that is emitted in a lateral direction from the vertical light-emitting structures to minimize the number of times that light emitted in a lateral direction from the vertical light-emitting structure is transmitted through the light-absorbing member, thereby increasing a luminous efficiency.