Light Emission-Detection Stack With Perovskite Wavelength Conversion
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Solution Overview
Problem
Existing optoelectronic devices face challenges in integrating infrared sources and receivers in a distributed manner within the LED matrix of display devices, limiting their adaptability and increasing manufacturing costs.
Innovation Solution
A light-emitting and receiving device is designed with a light-emitting diode and a light conversion and detection element, utilizing a perovskite material layer that absorbs and re-emits photons in different wavelength ranges, allowing for both emission and reception functions, with transparent electrodes and an optical filter to enhance selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate infrared sources and receivers are integrated into the LED matrix, then depth sensing capability is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent makes the LED serve dual functions: visible light emission for display and infrared emission for depth sensing. By controlling the LED to operate at different currents or wavelengths, it can function as both a display element and an infrared source, eliminating the need for separate infrared components and reducing device complexity
Solution Approach 2:
The patent combines the visible light emission and infrared emission functions into a single LED component. The LED structure is designed to emit both visible photons and infrared photons, merging what would traditionally require separate components into one integrated element, thereby simplifying the overall device architecture
2Adaptability or versatility
If separate infrared sources and receivers are integrated into the LED matrix, then depth sensing capability is achieved, but manufacturing cost increases
Solution Approach 1:
The LED is designed to perform multiple functions (visible display and infrared depth sensing) using the same component, which reduces the total number of parts that need to be manufactured and assembled. This multi-functionality directly lowers manufacturing costs by eliminating redundant components
Solution Approach 2:
By merging the infrared source and receiver functions into the existing LED structure, the patent eliminates the need for separate infrared component manufacturing and assembly processes, thereby reducing overall manufacturing complexity and cost
3Adaptability or versatility
If the light conversion and detection element uses photoluminescent material, then wavelength conversion is achieved, but material precision requirements increase
Solution Approach 1:
The patent adjusts the composition and properties of the photoluminescent material to optimize its conversion efficiency and wavelength transformation characteristics. By carefully controlling material parameters such as doping concentration and crystal structure, the system achieves effective wavelength conversion while managing manufacturing precision requirements
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 device achieves efficient light emission and detection using identical components, reducing production costs and enabling dynamic configuration for interactive displays with integrated infrared capabilities.
Implementation Method 1
the second active layer comprises a photoluminescent material adapted, during the emission phase, to absorb photons in the emission wavelength range of the light-emitting diode, and, in response, to re-emit photons in another wavelength range
Implementation Method 2
during the reception phase, to generate an electrical signal representative of absorbed light radiation
Data Source
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AI summary
The present description relates to a light-emitting and receiving device comprising: - a light-emitting diode (103) having a first active layer (105), a first electrode (107) in contact with the lower face of the first active layer (105), and a second electrode (109) in contact with the upper face of the first active layer (105); and - opposite the light-emitting diode (103), on an emission face of the light-emitting diode (103), a light conversion and detection element (117) having a second active layer (111), a third electrode (113) in contact with the lower face of the second active layer (111), and a fourth electrode (115) in contact with the upper face of the second active layer (111).