Fiber-Delivered Laser White Light With Remote Phosphor Conversion
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Solution Overview
Problem
Conventional light sources, such as incandescent bulbs and LEDs, face issues like high energy dissipation, thermal failure, broad spectrum emission, and lack of directionality, which limit their efficiency and application in specific lighting needs.
Innovation Solution
A fiber-delivered phosphor-emitted white light system utilizing gallium and nitrogen containing laser diodes with a phosphor material, integrated with a fiber and laser pump-light delivery configuration, providing a high-efficiency, directional, and tunable white light source suitable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional light bulbs are used, then lighting function is provided, but energy dissipation exceeds 90% as thermal energy
Solution Approach 1:
The patent transitions from thermal radiation (incandescent) to photoluminescence (phosphor-converted LED) as the light generation mechanism. By changing the physical parameter of light emission from thermal to quantum mechanical processes, energy efficiency improves dramatically while maintaining lighting function.
Solution Approach 2:
The patent replaces the thermal-mechanical system of incandescent bulbs with an electrical-optical system using semiconductor LEDs and phosphor conversion. This substitution eliminates the need for thermal conversion, directly converting electrical energy to optical energy with minimal losses.
2Reliability
If conventional light bulbs are used, then light is emitted, but thermal expansion and contraction causes routine failure
Solution Approach 1:
The patent replaces the thermal-based incandescent system with a cold-light semiconductor system. LEDs operate at significantly lower temperatures, eliminating thermal expansion and contraction cycles that cause filament failure in conventional bulbs, thereby dramatically improving reliability.
Solution Approach 2:
The patent changes the operating temperature parameter from high (incandescent) to low (LED), fundamentally altering the thermal stress profile and eliminating the primary failure mechanism of conventional lighting.
3Illumination intensity
If conventional light bulbs are used, then broad spectrum light is emitted, but much of it is not perceived by the human eye
Solution Approach 1:
The patent applies local quality by using a blue LED to excite a yellow phosphor, creating a targeted spectral distribution that concentrates energy in the visible range where human eyes are most sensitive, rather than emitting uniformly across all wavelengths.
Solution Approach 2:
The patent changes the spectral distribution parameters by using phosphor down-conversion, transforming the blue LED light into a combination of blue and yellow wavelengths that together form perceived white light with high visibility efficiency.
4Ease of operation
If conventional light bulbs are used, then light is emitted in all directions, but directionality and focus are lost
Solution Approach 1:
The patent segments the light emission by using multiple discrete LED chips arranged in specific geometric patterns, allowing independent control of different light beams. This enables precise directional control and beam shaping that cannot be achieved with omnidirectional incandescent bulbs.
Solution Approach 2:
The patent employs asymmetric optical design by positioning LEDs and phosphors at specific angles and locations within the housing, creating directed beam patterns rather than omnidirectional emission. This asymmetric arrangement enables focused lighting and projection capabilities.
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 system achieves high luminance, long-range visibility, and improved color quality with reduced thermal issues and energy consumption, enabling applications in dynamic lighting, LIDAR, LiFi, and automotive lighting.
Implementation Method 1
A fiber-delivered phosphor-emitted white light system utilizing gallium and nitrogen containing laser diodes with a phosphor material
Implementation Method 2
fiber-delivered phosphor-emitted white light system
Data Source
AI summary
The present disclosure provides an apparatus for generating fiber delivered laser-induced white light. The apparatus includes a package case enclosing a board member with an electrical connector through a cover member and a laser module configured to the board member inside the package case. The laser module comprises a support member, at least one laser diode device configured to emit a laser light of a first wavelength, a set of optics to guide the laser light towards an output port. Additionally, the apparatus includes a fiber assembly configured to receive the laser light from the output port for further delivering to a light head member disposed in a remote destination. A phosphor material disposed in the light head member receives the laser light exited from the fiber assembly to induce a phosphor emission of a second wavelength for producing a white light emission substantially reflected therefrom for various applications.