A photon-recycling incandescent lighting device
Heng Zhang1, Zhequn Huang2, Min Ding3
1School of Materials Science and Engineering, State Key Laboratory of Metal Matrix Composites, Center for Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, China.
Science Advances
|April 12, 2023
Summary
Researchers developed a new lighting device that revives incandescent technology. This photon-recycling incandescent lighting device (PRILD) offers superior energy efficiency, color rendering, and lifespan compared to current lighting solutions.
Area of Science:
- Materials Science
- Optics
- Energy
Background:
- Incandescent lighting offers excellent color rendering but suffers from low luminous efficacy and short lifespan.
- Current solid-state lighting (SSL) technologies have limitations in color fidelity and efficiency.
- There is a need for energy-efficient lighting with high-quality visual characteristics.
Purpose of the Study:
- To propose and experimentally realize an energy-efficient incandescent lighting device.
- To enhance luminous efficacy, color rendering index (CRI), and lifetime of incandescent lighting.
- To develop a novel lighting solution competitive with solid-state lighting.
Main Methods:
- Designed a visible-transparent infrared-reflective filter using machine learning (637 nm thickness).
- Utilized a Janus carbon nanotube/hexagonal boron nitride filament.
- Implemented a photon-recycling mechanism to recover infrared radiation.
Main Results:
- Achieved a luminous efficacy of 173.6 lumens per watt (25.4% efficiency).
- Demonstrated a high color rendering index (CRI) of 96.
- Obtained an LT70-rated lifetime exceeding 60,000 hours.
- Recycled 92% of infrared radiation, significantly boosting performance.
Conclusions:
- The photon-recycling incandescent lighting device (PRILD) surpasses traditional incandescent bulbs and current SSL in key performance metrics.
- PRILD offers a promising alternative for high-power density lighting applications requiring high luminous efficacy, CRI, and longevity.
- This technology represents a significant advancement in energy-efficient and high-quality lighting solutions.
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