Solid State White Light Lamp Using Blue and Violet Pumped Emitters
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Solution Overview
Problem
Conventional lamps based on solid state light emitters (SSLEs) face challenges in achieving high color rendering index (CRI) for objects coated with brighteners, as they often emit significant ultraviolet and violet light that can degrade materials and affect color fidelity.
Innovation Solution
The use of blue-pumped and violet-pumped SSLEs, with specific phosphors and a filter material, to produce white light that intermixes and reduces ultraviolet content, enhancing CRI and material durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional SSLEs are used to illuminate objects coated with brighteners, then the brighteners can absorb UV and violet light to emit blue light and enhance color, but the significant UV and violet emission degrades materials and affects color fidelity
Solution Approach 1:
The invention segments the white light generation into multiple SSLEs with different pump wavelengths (violet-pumped and blue-pumped). Each SSLE uses phosphors to convert its pump wavelength to a portion of the visible spectrum, and the lights are mixed to create white light with reduced UV content while maintaining color enhancement capabilities.
Solution Approach 2:
The invention changes the spectral parameters by using SSLEs with specific pump wavelengths (violet and blue) and selecting phosphors with appropriate emission characteristics. This parameter optimization reduces UV content below 5% while maintaining the ability to excite brighteners and achieve high CRI.
2Object-affected harmful factors
If blue-pumped and violet-pumped SSLEs are used to reduce UV content, then material durability improves, but the device complexity increases due to multiple light sources and phosphor combinations
Solution Approach 1:
The invention merges multiple SSLEs (violet-pumped and blue-pumped) and their respective phosphor systems into a unified lamp assembly. The support structure integrates these components to produce combined white light with reduced UV content, achieving the desired effect while managing complexity through systematic integration.
3Manufacturing precision
If multiple SSLEs with different pump wavelengths are integrated, then color rendering index improves for brightener-coated objects, but the manufacturing precision requirements increase
Solution Approach 1:
The support structure serves as an intermediary that fixedly supports and orients the multiple SSLEs. It ensures proper alignment and positioning of the violet-pumped and blue-pumped SSLEs relative to each other, enabling the beam-spreading and intermixing of light while maintaining manufacturing precision requirements.
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 combined white light achieves improved color rendering and reduced ultraviolet emission, suitable for illuminating sensitive materials and maintaining color fidelity, while optimizing material utilization and cost.
Implementation Method 1
blue-pumped phosphors for converting a portion of the blue light to non-blue visible light
Implementation Method 2
violet-pumped phosphors for converting a portion of the violet light to non-violet visible light
Implementation Method 3
the blue-pumped white light and the violet-pumped white light will propagate in a common direction and intermix with each other through beam-spreading
Data Source
AI summary
A lamp includes blue-pumped solid state light emitters (SSLEs) and violet-pumped SSLEs. Each blue-pumped SSLE has a blue excitation source configured to output blue light, and blue-pumped phosphors for converting a portion of the blue light to non-blue visible light, for the blue-pumped SSLEs to output blue-pumped white light. Each violet-pumped SSLE has a violet excitation source configured to output violet light, and violet-pumped phosphors for converting a portion of the violet light to non-violet visible light, for the one or more violet-pumped SSLEs to output violet-pumped white light. A support structure fixedly supports the blue-pumped SSLEs and the violet-pumped SSLEs in an orientation such that the blue-pumped white light and the violet-pumped white light will propagate in a common direction and intermix with each other through beam-spreading to yield a combined white light.