Borate Luminous Material for Field Emission Displays
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Solution Overview
Problem
Current fluorescence powders used in field emission devices, such as sulfides and oxides, face issues with decomposition under electron beam bombardment, sulfur poisoning, and low luminescence efficiency, which affect the brightness and lifespan of these devices.
Innovation Solution
Development of borate luminous materials with the compound M2(Re1-xLnx)2B2O7, where x is between 0 and 0.5, incorporating alkali metal elements and rare earth ions, which are synthesized through a method involving grinding and calcining of raw materials, avoiding sulfur poisoning and enhancing luminescence efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sulfide fluorescence powders are used, then high brightness is achieved, but sulfur poisoning occurs and luminescence efficiency decreases
Solution Approach 1:
The invention changes the chemical composition parameters by replacing sulfur-based compounds with borate-based compounds containing rare earth elements. This fundamental parameter change eliminates sulfur poisoning while maintaining high brightness through the photoluminescence properties of rare earth-doped borate materials, resolving the contradiction between brightness and luminescence efficiency stability
Solution Approach 2:
The invention uses composite materials combining borate base compounds with rare earth element dopants (such as Eu³⁺, Tb³⁺, Dy³⁺). This composite approach achieves high brightness through rare earth photoluminescence while the borate matrix provides chemical stability and prevents degradation, simultaneously satisfying both brightness and reliability requirements
2Reliability
If oxide fluorescence powders are used, then good stability is achieved, but luminescence efficiency is low
Solution Approach 1:
The invention creates composite borate materials where the borate matrix provides excellent chemical stability similar to oxides, while rare earth element dopants contribute high luminescence efficiency. This composite structure combines the advantages of both oxide stability and high luminescence, overcoming the limitation of traditional oxide phosphors
Solution Approach 2:
The invention changes from traditional oxide composition to borate composition with rare earth doping. This parameter change in chemical composition enables simultaneous achievement of high stability (from borate matrix) and high luminescence efficiency (from rare earth activators), resolving the contradiction between stability and luminescence efficiency
3Manufacturing precision
If complex preparation methods are used, then high purity products are obtained, but manufacturing costs increase
Solution Approach 1:
The invention extracts and eliminates unnecessary complex preparation steps from traditional synthesis methods. By using direct solid-state reaction of readily available raw materials (borates and rare earth oxides/carbides/nitrates), the method achieves high purity products without requiring complex intermediate processing steps, thereby reducing manufacturing costs while maintaining product quality
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 borate luminous materials exhibit high luminescence efficiency, chemical stability, and high color purity, while the simplified synthesis process reduces costs and maintains high product quality, overcoming the limitations of traditional materials.
Implementation Method 1
M2(Re1-xLnx)2B2O7 series oxide doped with rare earth... have high luminescence efficiency... high color purity
Implementation Method 2
The working principle of the new type field emission devices is similar to that of the traditional cathode ray tube (CRT), the application of imaging or lighting are realized by bombardment of electron beam to trichromatic fluorescence powders
Data Source
AI summary
Borate luminous material is provided, wherein, comprises the compound of following structural formula: M2(Re1-xLnx)2B2O7, wherein x is in a range of 0<x≰0.5, M is alkali metal element, Ln is at least one of Tm, Tb, Eu, Sm, Pr, Dy, Ce and Bi, Re is selected from one or more element of Y, Gd, Sc, Lu and La. The preparation method of borate luminous material also is provided. The borate luminous material has the advantages of good stability, high luminescence efficiency and high color purity.