Microcavity Light-Emitting Element for Multi-Wavelength Amplification
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Solution Overview
Problem
Conventional light-emitting elements with a single mode microcavity structure can only intensify light of one wavelength, making it difficult to achieve the wide color gamut required for lighting applications, which necessitates amplification of multiple wavelengths for desired emission colors.
Innovation Solution
A light-emitting element with a microcavity structure featuring a pair of electrodes, including a reflective and a semi-reflective electrode, and an EL layer with multiple light-emitting layers, where the optical path length between the electrodes is set to resonate with multiple wavelengths, allowing for the amplification of light across the visible spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single mode microcavity structure is used, then light of one wavelength can be intensified, but multiple wavelengths cannot be amplified simultaneously
Solution Approach 1:
The patent divides the microcavity structure into multiple independent microcavities, each designed to resonate at different wavelengths. This segmentation allows each cavity to intensify light at its specific resonant wavelength while collectively covering a broad spectrum, resolving the contradiction between single-wavelength intensity and multi-wavelength coverage.
Solution Approach 2:
The patent creates a multi-functional microcavity system where each microcavity serves the universal function of light intensification but at different wavelengths. This multi-functionality approach enables the overall structure to amplify multiple wavelengths simultaneously, achieving both high intensity at specific wavelengths and broad wavelength coverage.
2Temperature
If multiple light-emitting substances are used to cover wide wavelength range, then color temperature can be adjusted, but it becomes difficult to satisfy luminance and reliability standards simultaneously
Solution Approach 1:
The patent assigns different light-emitting substances to different regions or layers within the device, each optimized for specific wavelength ranges. The microcavity structure then selectively intensifies these emissions at their respective resonant wavelengths. This local quality approach allows precise control over color temperature while maintaining high luminance and reliability through targeted wavelength amplification.
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 approach enables the production of a light-emitting element that can amplify multiple wavelengths, resulting in a lighting device with a suitable color temperature and low power consumption, capable of emitting white light with excellent color balance and high emission efficiency.
Implementation Method 1
by setting the optical thickness of an EL element to a certain thickness or more, a resonant structure is formed for light with a plurality of wavelengths
Implementation Method 2
a so-called microcavity effect becomes conspicuous. A microcavity is a phenomenon in which light with a particular wavelength is intensified
Implementation Method 3
One of the pair of electrodes is a reflective electrode which gives a reflective surface, and the other of the pair of electrodes is an electrode which gives a semi-reflective surface
Data Source
AI summary
Disclosed is a light-emitting element with a microcavity structure which is capable of amplifying a plurality of wavelengths to give emission of a desired color. The light-emitting element includes a pair of electrodes and an EL layer having a light-emitting substance interposed between the pair of electrodes. One of the pair of electrodes gives a reflective surface and the other electrode gives a semi-reflective surface. The light-emitting element is arranged so that the emission of the light-emitting substance covers at least two wavelengths λ and an optical path length L between the reflective surface and the semi-reflective surface satisfies an equation L=nλ/2 where n is an integer greater than or equal to 2.