Selective Wavelength Reflectors for SST Light Extraction
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Solution Overview
Problem
Conventional solid-state transducer (SST) devices suffer from inefficient light extraction due to inward propagation and reflections of converter emissions, which are not effectively managed by sub-optimal reflectors, leading to reduced light extraction efficiency.
Innovation Solution
The implementation of a selective wavelength reflector positioned between emitters to transmit emissions from one emitter while reflecting those from another, preventing inward reflections and enhancing light extraction by spatially separating the SST structure from the converter material, thereby redirecting inwardly-directed emissions towards the front side of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If converter material is deposited on or near the LED structure to generate white light, then the device can produce white light emissions, but inward converter emissions reflect off the LED structure and surrounding components multiple times, reducing light extraction efficiency
Solution Approach 1:
A selective wavelength reflector is introduced as an intermediary component positioned between the converter material and the LED structure. This reflector selectively reflects inwardly-directed converter emissions while allowing LED emissions to pass through, preventing harmful reflections off the LED structure and improving light extraction efficiency
Solution Approach 2:
The reflector is designed with wavelength-selective properties, having different optical characteristics for different wavelength ranges. It is highly reflective for converter material emissions (longer wavelengths) and highly transmissive for LED emissions (shorter wavelengths), allowing each wavelength to be treated differently to optimize overall device performance
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 enhances light extraction efficiency by preventing emissions from the converter material from reflecting off the SST structure, allowing more light to exit the device, thereby improving the overall efficiency of SST devices.
Implementation Method 1
a selective wavelength reflector positioned between emitters to transmit emissions from one emitter while reflecting those from another
Implementation Method 2
the converter material 26 absorbs some of the emissions generated by the LED structure 12 and reemits light having a longer wavelength
Data Source
AI summary
Solid state transducer (“SST”) devices with selective wavelength reflectors and associated systems and methods are disclosed herein. In several embodiments, for example, an SST device can include a first emitter configured to emit emissions having a first wavelength and a second emitter configured to emit emissions having a second wavelength different from the first wavelength. The first and second emitters can be SST structures and/or converter materials. The SST device can further include a selective wavelength reflector between the first and second emitters. The selective wavelength reflector can be configured to at least substantially transmit emissions having the first wavelength and at least substantially reflect emissions having the second wavelength.