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Combined selective emitter and filter for high performance incandescent lighting

Leroy, Arny and Bhatia, Bikram and Wilke, Kyle and Ilic, Ognjen and Soljačić, Marin and Wang, Evelyn N. (2017) Combined selective emitter and filter for high performance incandescent lighting. Applied Physics Letters, 111 (9). Art. No. 094103. ISSN 0003-6951. doi:10.1063/1.4989522.

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The efficiency of incandescent light bulbs (ILBs) is inherently low due to the dominant emission at infrared wavelengths, diminishing its popularity today. ILBs with cold-side filters that transmit visible light but reflect infrared radiation back to the filament can surpass the efficiency of state-of-the-art light-emitting diodes (LEDs). However, practical challenges such as imperfect geometrical alignment (view factor) between the filament and cold-side filters can limit the maximum achievable efficiency and make the use of cold-side filters ineffective. In this work, we show that by combining a cold-side optical filter with a selective emitter, the effect of the imperfect view factor between the filament and filter on the system efficiency can be minimized. We experimentally and theoretically demonstrate energy savings of up to 67% compared to a bare tungsten emitter at 2000 K, representing a 34% improvement over a bare tungsten filament with a filter. Our work suggests that this approach can be competitive with LEDs in both luminous efficiency and color rendering index (CRI) when using selective emitters and filters already demonstrated in the literature, thus paving the way for next-generation high-efficiency ILBs.

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Additional Information:© 2017 AIP Publishing. Received 9 June 2017; accepted 14 August 2017; published online 1 September 2017. This work was primarily supported as part of the Solid-State Solar Thermal Energy Conversion (S3TEC) Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. #DE-FG02-09ER46577. A. Leroy acknowledges funding received from the Fonds de Recherche du Québec—Nature et Technologies (FRQNT).
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Department of Energy (DOE)DE-FG02-09ER46577
Fonds de Recherche du Québec-Nature et Technologies (FRQNT)UNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20170901-125127405
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81076
Deposited By: Tony Diaz
Deposited On:01 Sep 2017 20:01
Last Modified:15 Nov 2021 19:40

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