Wavelength Converting Device Recessed Binder Surface

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Solution Overview

Problem

Conventional wavelength converting devices experience a decrease in optical output due to light absorption by the binder material, which reduces the efficiency of light emission from fluorescent material powders.

Innovation Solution

The wavelength converting device incorporates a substrate with a wavelength converting member featuring a fluorescent material powder and a binder, where first and second recesses are formed on the binder's surface to expose side surfaces of the fluorescent material powder, allowing direct emission of light without passing through the binder, thereby reducing absorption and enhancing optical output.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If glass binder is used for binding fluorescent material powder, then heat resistance and weather resistance are improved, but light absorption by the binder causes decrease in optical output

Engineering Contradiction:

Improveheat resistance and weather resistanceVSAvoidoptical output

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The invention introduces a three-dimensional surface structure with recesses and protrusions on the binder surface. This dimensional change creates air gaps between the fluorescent powder particles and the binder, allowing converted light to escape through multiple paths rather than being trapped and absorbed by the binder material, thus improving optical output while maintaining the binder's protective functions

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The binder surface is designed with a porous-like structure consisting of recesses and protrusions. This structure reduces the contact area between the binder and the converted light, minimizing light absorption by the binder while still providing adequate binding and protection for the fluorescent material powder

Inventive Principle:

Principle #31Porous materials

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 significantly improves optical output by minimizing light absorption within the binder, resulting in a higher optical output power and more efficient light emission.

Implementation Method 1

a wavelength converting member (20) which has a fluorescent material powder (30) and a binder (40) for binding the fluorescent material powder

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS9519207B2Wavelength converting device and light emitting device using the same

Publication Date: 2016.12.13 NICHIA CORP

AI summary

Provided is a wavelength converting device having excellent optical output.The wavelength converting device includes a substrate and a wavelength converting member disposed on the substrate. The wavelength converting member includes a fluorescent material powder and a binder binding the fluorescent material powder. An upper surface of the wavelength converting member serves as a light emitting surface which includes upper surfaces of the fluorescent material powder and an upper surface of the binder. The binder has first recesses formed adjacent to the fluorescent material powder in the upper surface of the binder.