Wavelength Conversion Element Thermal Quenching

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Solution Overview

Problem

Existing projector technologies with fluorescent material layers face challenges in maintaining high luminous efficiency due to thermal quenching caused by poor heat rejection properties, especially at increased light intensities, which degrades performance across the entire range of film thicknesses.

Innovation Solution

A wavelength conversion element with a fluorescent material layer having a volume concentration of the fluorescent material between 15 vol % and 50 vol %, and a thickness of up to 150 μm, combined with a rotating fluorescent plate to prevent local heat generation and enhance heat dissipation, is used in conjunction with a solid-state light emitting excitation source to achieve high emission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the film thickness of the fluorescent material layer is increased, then the light intensity is improved, but the heat rejection property deteriorates causing thermal quenching

Engineering Contradiction:

Improvelight intensityVSAvoidtemperature of fluorescent material layer

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The invention changes the physical parameters of the fluorescent material layer by controlling the volume concentration of fluorescent material (10-50 vol%) and film thickness (50-200 μm) to optimize the balance between light intensity and heat rejection, preventing thermal quenching while maintaining brightness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite structure consisting of fluorescent material particles dispersed in a transparent resin matrix, creating a material system that combines the high light-emitting capability of fluorescent materials with the heat dissipation properties of the resin binder

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If the volume concentration of fluorescent material is increased, then the emission efficiency is improved, but the film quality deteriorates

Engineering Contradiction:

Improveemission efficiencyVSAvoidfilm quality

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The invention optimizes the volume concentration parameter within the specific range of 10-50 vol% to achieve high emission efficiency while preventing aggregation and maintaining uniform film formation, balancing performance with manufacturability

Inventive Principle:

Principle #35Parameter changes

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 ensures high emission efficiency and reliability across a broad range of film thicknesses by minimizing thermal quenching and maintaining uniform emission intensity, while also allowing for the formation of a high-quality fluorescent material layer.

Implementation Method 1

a fluorescent material layer (32) formed along both surfaces of the substrate (31), the fluorescent material layer (32) including a binder and a plurality of fluorescent material particles

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

combined with a rotating fluorescent plate to prevent local heat generation and enhance heat dissipation

Methodology Applied

Scientific EffectRotational motion for heat distribution:

Data Source

PatentUS9206959B2Wavelength conversion element, light source device, and projector

Publication Date: 2015.12.08 SEIKO EPSON CORP

AI summary

A wavelength conversion element includes a substrate, and a fluorescent material layer disposed on the substrate. The volume concentration of the fluorescent material in the fluorescent material layer is equal to or higher than 15 vol %.