High performance incandescent light bulb using a selective emitter and nanophotonic filters
Author(s)
Wang, Evelyn N.
Leroy, Arny
Wilke, Kyle L.
Bhatia, Bikramjit S
Soljacic, Marin
Ilic, Ognjen
Date Issued
September 2017
Journal
Thermal Radiation Management for Energy Applications
Publisher
SPIE
Citation
Leroy, Arny, Kyle Wilke, Marin Soljačić, Evelyn N. Wang, Bikram Bhatia, and Ognjen Ilic. “High Performance Incandescent Light Bulb Using a Selective Emitter and Nanophotonic Filters.” Edited by Mowafak M. Al-Jassim and Peter Bermel. Thermal Radiation Management for Energy Applications (September 6, 2017), San Diego, California, United States, SPIE, 2017. © 2017 SPIE
Version
Final published version
Abstract
Previous approaches for improving the efficiency of incandescent light bulbs (ILBs) have relied on tailoring the emitted spectrum using cold-side interference filters that reflect the infrared energy back to the emitter while transmitting the visible light. While this approach has, in theory, potential to surpass light-emitting diodes (LEDs) in terms of luminous efficiency while conserving the excellent color rendering index (CRI) inherent to ILBs, challenges such as low view factor between the emitter and filter, high emitter (>2800 K) and filter temperatures and emitter evaporation have significantly limited the maximum efficiency. In this work, we first analyze the effect of non-idealities in the cold-side filter, the emitter and the view factor on the luminous efficiency. Second, we theoretically and experimentally demonstrate that the loss in efficiency associated with low view factors can be minimized by using a selective emitter (e.g., high emissivity in the visible and low emissivity in the infrared) with a filter. Finally, we discuss the challenges in achieving a high performance and long-lasting incandescent light source including the emitter and filter thermal stability as well as emitter evaporation.
MIT Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Device Research Laboratory
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1117/12.2275299
