Nitridoberyllate Phosphor Thermal Stability
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Solution Overview
Problem
Current phosphor systems for light-emitting diodes (LEDs) face challenges such as low stability, high luminescence losses due to thermal de-excitation, and inefficient wavelength conversion, particularly at elevated temperatures, which affect the reliability and efficiency of phosphor-converted LEDs (PCLEDs).
Innovation Solution
The development of nitridoberyllate phosphors with a trigonal planar BeN3 structure and/or tetrahedral Be(N,O)4 structure, doped with Eu2+ or Ce3+, which offer higher stability, large optical band gaps, and reduced thermal de-excitation, leading to longer luminescence lifetimes and higher quantum efficiency, along with chemical inertness and narrow band emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphor systems are used in LEDs, then the device can achieve basic wavelength conversion, but the phosphor exhibits low stability and high luminescence losses at elevated temperatures
Solution Approach 1:
The patent changes the chemical composition parameters of the phosphor by incorporating beryllium into the crystal structure, forming nitridoberyllate phosphors with specific stoichiometric ratios. This compositional parameter change results in enhanced thermal stability and reduced luminescence losses at elevated temperatures compared to conventional phosphors.
Solution Approach 2:
The patent creates composite phosphor materials by combining beryllium with other elements to form nitridoberyllate compounds with specific crystal structures. These composite materials exhibit synergistic properties that simultaneously improve stability and reduce energy losses, resolving the contradiction between reliability and energy efficiency.
2Loss of energy
If conventional phosphors are used for wavelength conversion, then the device can operate, but thermal de-excitation occurs leading to reduced quantum efficiency
Solution Approach 1:
The patent modifies the energy level parameters of the phosphor by introducing beryllium into the crystal lattice, which alters the electronic structure and energy transitions. This parameter change increases the energy gap between excited and ground states, reducing thermal de-excitation pathways and improving quantum efficiency.
3Duration of action of moving object
If standard phosphor materials are employed, then the device can achieve wavelength conversion, but the luminescence lifetime is limited
Solution Approach 1:
The patent develops nitridoberyllate phosphor compounds as composite materials with optimized crystal structures. These composite materials provide both extended luminescence lifetimes through appropriate energy level configurations and maintained high conversion efficiency through reduced non-radiative decay pathways.
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 nitridoberyllate phosphors provide enhanced stability and conversion efficiency, minimizing luminescence losses at higher temperatures, resulting in improved reliability and performance of PCLEDs with extended luminescence lifetimes and higher quantum efficiency.
Implementation Method 1
The wavelength converting material absorbs light emitted by the LED and emits light of a different, longer wavelength
Implementation Method 2
high luminescence losses due to thermal de-excitation
Data Source
AI summary
Embodiments of the invention include a light source and a nitridoberyllate phosphor disposed in a path of light emitted by the light source. The nitridoberyllate phosphor includes a trigonal planar BeN3 structure and/or a tetrahedral Be(N,O)4 structure.