Tunable Nitridosilicate Phosphor for LED Color Rendering
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Solution Overview
Problem
Current LED lighting technologies face challenges in achieving a suitable emission spectrum and chemical stability for color rendering and thermal stability, particularly in nitride phosphors without oxygen, which lack tunability and require additional red-emitting phosphors for white illumination.
Innovation Solution
A method for forming a tunable luminescent material by mixing strontium nitride, silicon nitride, and aluminum nitride with europium under high temperature and pressure, creating a nitridosilicate phosphor with adjustable emission and excitation spectra by varying aluminum content, enabling red to blue light emission without oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitridosilicate phosphors without oxygen are used, then chemical stability and thermal stability are improved, but emission spectrum tunability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing aluminum nitride into the nitridosilicate system and controlling the Al/Si ratio. This parameter adjustment enables emission wavelength tuning from blue to red while preserving the oxygen-free condensed framework structure that provides chemical and thermal stability.
Solution Approach 2:
The patent creates a composite nitridosilicate material combining silicon nitride, aluminum nitride, and strontium nitride in specific ratios. This composite approach allows simultaneous achievement of structural stability from the condensed framework and emission tunability from the aluminum-induced spectral modifications.
2Temperature
If nitridosilicate phosphors without oxygen are used, then thermal stability is improved, but emission spectrum coverage for white illumination deteriorates
Solution Approach 1:
By adjusting the aluminum content parameter in the nitridosilicate composition, the emission spectrum can be tuned to cover different wavelength ranges. The patent optimizes the Al/Si ratio to achieve broad spectrum coverage suitable for white illumination while maintaining the thermally stable oxygen-free structure.
3Adaptability or versatility
If aluminum content is increased in nitridosilicate phosphor, then emission wavelength tuning from blue to red is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent uses a single compositional parameter (aluminum content or Al/Si ratio) to control emission wavelength. This simplifies manufacturing compared to using multiple different phosphor materials, as only the aluminum concentration needs to be adjusted during synthesis while maintaining the same base compound structure.
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 resulting nitridosilicate phosphor exhibits enhanced chemical and thermal stability, offering a tunable emission spectrum from red to blue, suitable for white LED applications, and provides a stable chemical structure, addressing the limitations of existing nitride phosphors.
Implementation Method 1
A tunable nitridosilicate phosphor doped by a rare earth element and having an emission spectrum tunable by an aluminum content of the nitridosilicate phosphor
Data Source
AI summary
The present disclosure provides an illuminating system including a light emitting diode (LED); and a tunable luminescent material disposed approximate the light-emitting diode, wherein the tunable luminescent material includes alkaline earth metal (AE) and silicon aluminum nitride doped by a rare earth element (RE), formulated as (AE)Si6−pAlpN8, wherein p is a parameter defining a relative aluminum content in weight and p is greater than zero.