Quantum Dot Color Correction for Warmer CCT Without Lumen Loss

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Solution Overview

Problem

Conventional color correction methods for reducing correlated color temperature (CCT) by using filters absorb light in the yellow/green region, leading to lumens being wasted and insufficient red output, which is not optimal for achieving warmer CCTs.

Innovation Solution

Employing quantum dots (QDs) to downconvert blue or violet light to red light, maintaining yellow and green light, thereby optimizing color fidelity and lumens without significant reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional filters are used to reduce CCT, then the color temperature is reduced, but lumens are wasted due to absorption in the yellow/green region

Engineering Contradiction:

Improvecorrelated color temperatureVSAvoidlumen loss

Core Design Contradiction:

TemperatureVSLoss of energy

Solution Approach 1:

The patent changes the mechanism of color temperature adjustment from absorption-based filtering to emission-based conversion. By using phosphors with specific emission characteristics, the system converts blue light to yellow/green light through photoluminescence, thereby changing the spectral parameters without absorbing useful lumens. This resolves the contradiction by transforming the physical principle from absorption to emission.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful effect of blue light (which causes cool color temperature) into a beneficial effect by using it to excite phosphors that emit yellow/green light. The blue light that would otherwise be problematic is now the pumping source for generating the desired warm color components, turning a disadvantage into an advantage.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Temperature

If conventional filters are used to reduce CCT, then the color temperature is reduced, but red output becomes insufficient

Engineering Contradiction:

Improvecorrelated color temperatureVSAvoidred light output

Core Design Contradiction:

TemperatureVSIllumination intensity

Solution Approach 1:

The patent applies local quality by using multiple phosphors with different emission characteristics in specific locations within the LED package. Each phosphor layer is optimized to emit specific wavelength ranges (yellow, green, red), ensuring that red light output is sufficiently maintained while achieving the desired color temperature reduction. This localized optimization of spectral properties resolves the contradiction.

Inventive Principle:

Principle #3Local quality

3Temperature

If broad spectrum filters are used to suppress blue and green light, then CCT is reduced, but yellow/green light is detrimentally suppressed

Engineering Contradiction:

Improvecorrelated color temperatureVSAvoidyellow/green light output

Core Design Contradiction:

TemperatureVSIllumination intensity

Solution Approach 1:

The patent substitutes the mechanical/optical filtering system with a photoluminescent conversion system. Instead of using filters to block or absorb unwanted wavelengths, the system uses phosphors to actively convert blue light into yellow/green light through quantum mechanical processes. This substitution eliminates the detrimental suppression of yellow/green light while achieving CCT reduction.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

QDs enable a more efficient color correction by preserving lumens and adjusting the color point on the CIE diagram, enhancing lumen efficacy and achieving warmer CCTs without substantial luminous flux loss.

Implementation Method 1

a plurality of quantum dots (QDs) disposed in the light transmitting component, the QDs configured to downconvert a portion of the first light to a second light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Data Source

PatentUS20250383064A1Color correcting optical component

Publication Date: 2025.12.18 KORRUS INC

AI summary

A color correcting optical component (CCOC) for reducing the correlated color temperature (CCT) of a light source emitting a first light, the CCOC comprising: (a) a light transmitting component, the light transmitting component being discrete from the light source; (b) a connector operatively attached to the light transmitting component for connecting the light transmitting component to the light source such that at least a portion of the first light passes through the light transmitting component; (c) a plurality of quantum dots (QDs) disposed in the light transmitting component, the QDs configured to downconvert a portion of the first light to a second light, wherein the light transmitting component emits emitted light comprising a combination of at least the first light and second light.