JEM Phosphor Composition for High Emission Intensity

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Solution Overview

Problem

Conventional JEM phosphors emit blue or green light with low emission intensity, limiting their application in display devices and lighting systems.

Innovation Solution

A phosphor comprising a JEM crystal activated with Eu, specifically represented by MAl(Si, Al)6(O, N)10, where M includes Ca, Sr, and/or Eu, exhibiting enhanced emission brightness and stability, allowing for green-to-yellow color emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional JEM phosphors are used, then the phosphor can emit blue or green light, but the emission intensity is low

Engineering Contradiction:

Improveemission intensityVSAvoidemission stability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the JEM phosphor by introducing specific metal elements (M = Ca, Sr, Eu, La, Sc, Y, or lanthanoid elements) and controlling the ratios of Si and Al in the crystal structure. This compositional parameter optimization resolves the contradiction by achieving both high emission intensity and stable emission characteristics simultaneously

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite phosphor material with the general formula MAl(Si6-zAlz)N10-zOz, combining multiple elements in a specific crystal structure. This composite approach allows the phosphor to achieve enhanced emission intensity while maintaining stability, resolving the technical contradiction between brightness and reliability

Inventive Principle:

Principle #40Composite 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

The phosphor achieves high emission intensity and stability, suitable for various display devices and lighting applications, including VFD, FED, PDP, CRT, and white LED, with improved resistance to material degradation and ultraviolet absorption.

Implementation Method 1

the phosphor is excited by an excitation source with high energy such as a vacuum ultraviolet ray, an ultraviolet ray, an electron beam, and blue light so as to emit a visible light ray such as blue light, green light, yellow light, orange light, and red light

Methodology Applied

Scientific EffectPhotoluminescence: Photoluminescence

Implementation Method 2

the phosphor is excited by an excitation source with high energy such as a vacuum ultraviolet ray, an ultraviolet ray, an electron beam, and blue light

Methodology Applied

Scientific EffectCathodoluminescence: Cathodoluminescence

Data Source

PatentUS9909060B2Phosphor, light-emitting device, image display device, pigment, and ultraviolet absorber

Publication Date: 2018.03.06 NAT INST FOR MATERIALS SCI

AI summary

Provided are an oxynitride phosphor comprising a JEM crystal as a main component and being characterized by light-emitting properties (light emission color or excitation property, light emission spectrum) that is different from the known JEM phosphor, and an application thereof. The phosphor of the present invention comprises the JEM crystal activated with Eu and represented by MAl(Si, Al)6(O, N)10 (where the M element is one or more elements selected from the group consisting of Ca, Sr, Eu, La, Sc, Y, and lanthanoid elements; and includes at least Eu as well as Ca and/or Sr).