ZnS:Cu,Cl,Mn,Te Phosphor for White Light Emission

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Solution Overview

Problem

Current dispersion type electroluminescent devices lack a red light emitting phosphor, relying on photoluminescent phosphors or dyes to provide red light, which complicates their structure and operation.

Innovation Solution

A phosphor represented by ZnS:Cu,Cl,Mn,Te is developed, which emits red light when an electric field is applied, allowing for the creation of a white light emitting device that combines this phosphor with blue and green phosphors to simplify the device structure by eliminating the need for a separate red light source.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If photoluminescent phosphors or dyes are used to provide red light, then red light emission is achieved, but device structure becomes complicated and operation becomes complex

Engineering Contradiction:

Improvered light emissionVSAvoiddevice structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent combines multiple phosphor materials (ZnS:Cu,Cl for green-blue emission and CdTe:Mn for red emission) into a single integrated phosphor layer that can be excited by a single UV or blue LED source, eliminating the need for separate red light sources and complex optical systems

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The phosphor composition is designed to perform multiple functions simultaneously: ZnS:Cu,Cl provides green-blue emission while also serving as a host matrix for CdTe:Mn red phosphor particles, creating a universal phosphor layer that generates both green-blue and red light components from a single excitation source

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Illumination intensity

If multiple separate phosphors are used to create white light, then full spectrum coverage is achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvewhite light emissionVSAvoidmanufacturing process

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent merges green-blue phosphor (ZnS:Cu,Cl) and red phosphor (CdTe:Mn) into a single mixed phosphor composition that can be applied as one layer, simplifying the manufacturing process while maintaining full spectrum coverage for white light emission

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention creates a composite phosphor material consisting of ZnS:Cu,Cl matrix with dispersed CdTe:Mn particles, combining the advantages of both phosphor types into a single material system that can be processed and applied as one unit rather than multiple separate layers

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 excellent color purity with an emission spectrum peak around 650 nm, enabling a simplified electroluminescent device structure and improved light emission characteristics.

Implementation Method 1

A phosphor represented by Formula 1: ZnS:Cu,Cl,Mn,Te... emits red light when an electric field is applied

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS8501042B2Phosphor, white light emitting device including the phosphor and method of preparing the phosphor

Publication Date: 2013.08.06 SAMSUNG ELECTRONICS CO LTD

AI summary

A phosphor represented by Formula 1:ZnS:Cu,Cl,Mn,Te. Formula 1