White Light Source With Segmented Luminescent Conversion Layers

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current white light sources using light-emitting diodes with luminescent conversion materials struggle to provide a consistent color temperature across different applications, as the blue component of the light can vary significantly, affecting the color impression and requiring adjustable lighting solutions.

Innovation Solution

A white light source comprising light-emitting diodes subdivided into first and second types, with a conversion element using first and second luminescent conversion materials in matrix materials applied two-dimensionally, allowing for independent adjustment of color temperature by varying the intensity and spectral conversion of light emitted by each type of diode.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single luminescent conversion material is used in white light sources, then the structure is simple, but the color temperature cannot be adjusted or varied

Engineering Contradiction:

Improvecolor temperature adjustabilityVSAvoidconversion element structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The conversion element is segmented into multiple luminescent conversion materials (first, second, and third materials with different color temperatures) arranged in different regions. Each material converts light from specific LED types to produce distinct color temperatures, enabling adjustable white light output without requiring a completely different light source for each application.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different luminescent conversion materials are placed in specific regions corresponding to different LED types. The first material is positioned where first LEDs emit, the second material where second LEDs emit, allowing each region to have optimized color conversion properties tailored to its light source, thereby achieving variable color temperature output.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If multiple luminescent conversion materials are used in different regions, then variable color temperature is achieved, but the manufacturing process becomes more complex

Engineering Contradiction:

Improvecolor temperature variabilityVSAvoidapplication process

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent transitions from a single-layer conversion structure to a multi-layer or multi-region spatial arrangement. By organizing luminescent materials in different spatial zones (first, second, third materials in different regions), the system achieves color temperature control through spatial distribution rather than requiring complex temporal or mechanical adjustment mechanisms.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Temperature

If the blue component of light is increased for higher color temperature, then the color temperature increases, but the color impression becomes less suitable for certain applications

Engineering Contradiction:

Improvecolor temperatureVSAvoidcolor impression suitability

Core Design Contradiction:

TemperatureVSAdaptability or versatility

Solution Approach 1:

The white light source dynamically adjusts its color temperature by selectively activating different LED types and their corresponding luminescent conversion materials. The system can transition between color temperatures (e.g., from cooler with more blue component to warmer with less blue component) depending on application requirements, making the color impression suitable for different scenarios such as photography, stage lighting, or general illumination.

Inventive Principle:

Principle #15Dynamics

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 enables a variable color temperature white light source with distinct color nuances, suitable for applications like stage lighting and photography, by generating white light with different color temperatures in different regions, enhancing color consistency and adaptability.

Implementation Method 1

a conversion element configured to absorb light emitted by the light-emitting diodes and generate converted light with a longer wavelength than the emitted light, wherein the conversion element includes a first luminescent conversion material in a first matrix material

Methodology Applied

Scientific EffectLuminescent conversion: Photoluminescence

Data Source

PatentUS10910353B2White light source and method of producing a white light source

Publication Date: 2021.02.02 OSRAM OLED

AI summary

A white light source includes an arrangement of light-emitting diodes, wherein the light-emitting diodes are subdivided into first light-emitting diodes and second light-emitting diodes, and a conversion element configured to absorb light emitted by the light-emitting diodes and generate converted light with a longer wavelength than the emitted light, wherein the conversion element includes a first luminescent conversion material in a first matrix material, the first matrix material with the first luminescent conversion material is arranged two-dimensionally in a continuous layer above the first and second light-emitting diodes, the conversion element includes a second luminescent conversion material in a second matrix material, and the second matrix material with the second luminescent conversion material is arranged only above the second light-emitting diodes.