LED Lighting Device with Luminescent Materials for High Wall Plug Efficiency
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Solution Overview
Problem
Conventional lighting technologies, such as incandescent and fluorescent bulbs, are inefficient and have limitations in color rendering index (CRI) and lifespan, while solid-state light emitters like LEDs face challenges in producing white light efficiently and maintaining high energy efficiency and long lifespan.
Innovation Solution
A lighting device utilizing solid-state light emitters with luminescent materials positioned close to the LEDs, combined with specific LED configurations and power management to achieve high wall plug efficiency, warm white color temperature, and improved CRI, enabling efficient energy use and extended lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If incandescent light bulbs are used, then color rendering index (CRI) is high (greater than 95), but energy efficiency is very low (about 90% of electricity is released as heat rather than light)
Solution Approach 1:
The patent replaces the thermal radiation mechanism of incandescent bulbs with solid-state light emission from LEDs. The LED converts electrical energy directly to light through electroluminescence, eliminating the need to heat a filament to incandescence. This substitution of the fundamental light generation mechanism resolves the contradiction by achieving high energy efficiency without generating excessive heat.
Solution Approach 2:
The patent changes the operating parameters of the lighting system by using LEDs that operate at lower temperatures and convert electrical energy more efficiently into visible light. By adjusting the electrical-to-optical conversion parameters through solid-state physics rather than thermal physics, the system achieves high energy efficiency while minimizing harmful heat release.
2Use of energy by moving object
If fluorescent light bulbs are used, then energy efficiency is improved (about 10 times better than incandescent), but color rendering index and lifespan are still limited
Solution Approach 1:
The patent replaces the gas discharge and phosphor conversion mechanism of fluorescent bulbs with direct solid-state light emission from LEDs. This eliminates the need for mercury vapor, phosphor coatings, and complex electrode structures, resulting in a more reliable system with longer lifespan while maintaining high energy efficiency.
Solution Approach 2:
The patent uses composite LED structures combining different semiconductor materials and phosphor materials to achieve both high energy efficiency and extended lifespan. The composite nature of the LED device allows optimization of both efficiency and reliability simultaneously through material science advances.
3Use of energy by moving object
If solid state light emitters like LEDs are used, then energy efficiency and lifespan are improved, but producing white light efficiently and maintaining high color rendering index remain challenging
Solution Approach 1:
The patent uses phosphor materials as intermediaries to convert the blue or ultraviolet light from the LED into a broader spectrum that includes more wavelengths visible to the human eye. This intermediary conversion process enables the LED to produce white light with improved color rendering index while maintaining the high energy efficiency of the solid-state light source.
Solution Approach 2:
The patent employs composite material systems combining LED semiconductor materials with various phosphor materials to achieve both high energy efficiency and high color rendering index. The composite structure allows the LED to emit blue light efficiently while the phosphor converts portions of this light into other wavelengths, creating white light with excellent color rendering properties.
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 solution achieves a wall plug efficiency of at least 85 lumens per watt, a CRI of at least 90, and a warm color temperature, providing efficient, long-lasting, and high-quality lighting suitable for various applications.
Implementation Method 1
A lighting device utilizing solid-state light emitters with luminescent materials positioned close to the LEDs
Implementation Method 2
solid-state light emitters with luminescent materials positioned close to the LEDs
Data Source
AI summary
There is provided a lighting device which emits light with an wall plug efficiency of at least 85 lumens per watt. The lighting device comprises at least one solid state light emitter, e.g., one or more light emitting diodes, and optionally further includes one or more luminescent material. In some embodiments, the output light is of a brightness of at least 300 lumens. In some embodiments, the output light has a CRI Ra of at least 90. Also, a method of lighting, comprising supplying electricity to a lighting device which emits light with a wall plug efficiency of at least 85 lumens per watt.