Energy-saving quality road lighting with colloidal quantum dot nanophosphors

Date
2014
Advisor
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Source Title
Nanophotonics
Print ISSN
21928606
Electronic ISSN
Publisher
Walter de Gruyter GmbH
Volume
3
Issue
6
Pages
373 - 381
Language
English
Type
Article
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Abstract

Here the first photometric study of road-lighting white light-emitting diodes (WLEDs) integrated with semiconductor colloidal quantum dots (QDs) is reported enabling higher luminance than conventional light sources, specifically in mesopic vision regimes essential to street lighting. Investigating over 100 million designs uncovers that quality road-lighting QD-WLEDs, with a color quality scale and color rendering index ≥85, enables 13-35% higher mesopic luminance than the sources commonly used in street lighting. Furthermore, these QD-WLEDs were shown to be electrically more efficient than conventional sources with power conversion efficiencies ≥16-29%. Considering this fact, an experimental proof-of-concept QD-WLED was demonstrated, which is the first account of QD based color conversion custom designed for street lighting applications. The obtained white LED achieved the targeted mesopic luminance levels in accordance with the road lighting standards of the USA and the UK. These results indicate that road-lighting QD-WLEDs are strongly promising for energy-saving quality road lighting. © 2014 Science Wise Publishing & De Gruyter 2014.

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Keywords
light-emitting diodes (LEDs), mesopic vision, outdoor lighting, photometric design, quantum dots (QDs), Color, Energy conservation, Light sources, Luminance, Photometry, Roads and streets, Semiconductor diodes, Semiconductor quantum dots, Street lighting, Transportation, Colloidal quantum dots, Color conversions, Color rendering index, Conventional light sources, Lighting applications, Mesopic vision, Power conversion efficiencies, White lightemitting diodes (WLEDs), Light emitting diodes
Citation
Published Version (Please cite this version)