CaTiO3:Pr,M Fluorescent Material Brightness and Life
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Solution Overview
Problem
Conventional oxide fluorescent materials, such as SrTiO3:Pr,Al and CaTiO3, suffer from quick brightness deterioration and short life expectancy when excited by a low-voltage electron beam, and CaTiO3 emits light with significantly lower brightness compared to ZnCdS fluorescent materials.
Innovation Solution
A CaTiO3:Pr,M fluorescent material is developed, comprising calcium titanate with 0.003 to 0.05 mol % praseodymium as an activator and additional elements like aluminum, gallium, indium, zinc, magnesium, or potassium, which enhances brightness and life expectancy by optimizing praseodymium concentration and reducing crystal lattice defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If SrTiO3:Pr,Al fluorescent material is used, then red light emission is achieved, but brightness deteriorates quickly and life expectancy is short
Solution Approach 1:
The patent changes the host crystal material from SrTiO3 to CaTiO3 and optimizes the praseodymium concentration to 0.003-0.05 mol%, which fundamentally alters the material's stability characteristics and extends its operational life while maintaining brightness
Solution Approach 2:
The patent creates a composite fluorescent material by combining CaTiO3 host crystal with precisely controlled amounts of praseodymium (0.003-0.05 mol %) and aluminum (0.1-5 mol%), achieving both high brightness and long life expectancy through synergistic material composition
2Object-affected harmful factors
If CaTiO3 fluorescent material is used, then environmental safety is improved by eliminating cadmium and sulfur, but brightness is significantly lower than ZnCdS materials
Solution Approach 1:
The patent optimizes the praseodymium concentration parameter to a specific range (0.003-0.05 mol%) and controls aluminum content (0.1-5 mol%), which dramatically enhances the brightness of CaTiO3 material to reach at least 50 cd/m2, making it competitive with traditional materials while maintaining environmental safety
Solution Approach 2:
The patent introduces localized doping with praseodymium and aluminum elements at specific concentration ranges within the CaTiO3 crystal structure, creating optimal light emission centers that enhance brightness without compromising the overall environmental safety of the cadmium-free composition
3Use of energy by moving object
If low-voltage electron beam excitation is used, then energy consumption is reduced and VFD application is enabled, but brightness is insufficient compared to high-voltage excitation
Solution Approach 1:
The patent modifies the material composition parameters, specifically optimizing praseodymium concentration (0.003-0.05 mol%) and aluminum content (0.1-5 mol%), which enables the material to achieve high brightness efficiency under low-voltage electron beam excitation, producing at least 50 cd/m2 brightness while consuming less energy
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 CaTiO3:Pr,M fluorescent material achieves higher brightness and longer life expectancy than SrTiO3:Pr,Al, emitting light twice as bright as conventional CaTiO3 when excited by a low-voltage electron beam, and can be used in various display technologies like VFD, FED, CRT, and PDP.
Implementation Method 1
a CaTiO3:Pr,M fluorescent material comprising 100 mol % of calcium titanate CaTiO3 as a host crystal; from 0.003 mol % to 0.05 mol % of praseodymium Pr which is added, as a first additive, to the host crystal
Implementation Method 2
optimizing praseodymium concentration and reducing crystal lattice defects
Data Source
AI summary
A CaTiO3:Pr,M fluorescent material including 100 mol % of calcium titanate CaTiO3 as a host crystal; from 0.003 mol % to 0.05 mol % of praseodymium Pr which is added, as a first additive, to the host crystal; and at least one of aluminum Al, gallium Ga, indium In, zinc Zn, magnesium Mg, sodium Na, and potassium K which is added, as a second additive M, to the host crystal.