Light-emitting element with emission angle selection layer
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Solution Overview
Problem
Existing light-emitting technologies face challenges in suppressing the spread of the light-emitting region and improving directivity, leading to inefficiencies in coupling with optical systems and increased heat dissipation issues.
Innovation Solution
A light-emitting element comprising a phosphor layer, an emission angle selection layer, and a reflective layer, with a dielectric spacer and metal nanoparticles, where the phosphor layer includes a low reabsorption phosphor and a light scatterer, and the emission angle selection layer is designed to control the emission angle, reducing etendue and enhancing directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting structures are used, then light emission is achieved, but the light-emitting region spreads and directivity deteriorates
Solution Approach 1:
The light-emitting element is divided into distinct functional layers: a phosphor layer for light conversion and an emission angle selection layer for directional control. This segmentation allows each layer to independently optimize its function, with the emission angle selection layer specifically designed to suppress light-emitting region spread while maintaining high directivity.
Solution Approach 2:
The invention introduces a vertical layering dimension to control light emission characteristics. By stacking the phosphor layer and emission angle selection layer in the thickness direction, the system achieves directional control without increasing lateral dimensions, thus suppressing light-emitting region spread while improving directivity.
2Illumination intensity
If light emission is enhanced, then brightness is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The emission angle selection layer is extracted as a separate functional component from the conventional homogeneous light-emitting structure. This layer selectively extracts and transmits light within a specific emission angle range while blocking other angles, thereby improving brightness in the desired direction and facilitating heat dissipation by reducing total light emission volume.
3Illumination intensity
If the emission angle selection layer is added, then directivity is improved, but device complexity increases
Solution Approach 1:
The emission angle selection layer is merged with the phosphor layer to form an integrated light-emitting element structure. This combination achieves directional light emission without requiring separate external optical components, thereby improving directivity while minimizing the increase in device complexity.
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
The solution effectively suppresses the spread of the light-emitting region, improves directivity, and minimizes light emission reduction, suitable for applications in projectors and other light sources by reducing etendue and enhancing heat dissipation.
Implementation Method 1
a phosphor layer which causes fluorescence to occur with incident light
Implementation Method 2
the phosphor layer includes a phosphor and a light scatterer
Implementation Method 3
an emission angle selection layer that emits light incident at a predetermined angle
Implementation Method 4
the reflective layer, the phosphor layer, and the light emission angle selection layer are arranged in this order
Implementation Method 5
the phosphor layer contains fine metal particles which excite second surface plasmons with the incident light
Data Source
AI summary
An object is to provide a light-emitting element capable of further suppressing the spread of a light-emitting region and further improving directivity. A light-emitting element is provided which includes at least a phosphor layer and an emission angle selection layer which emits light incident at a predetermined angle, in which the phosphor layer includes a phosphor and a light scatterer, and the phosphor layer and the light emission angle selection layer are arranged in this order.