Energy-saving quality road lighting with colloidal quantum dot nanophosphors
Demir, Hilmi Volkan
Walter de Gruyter GmbH
373 - 381
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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.
Keywordslight-emitting diodes (LEDs)
quantum dots (QDs)
Roads and streets
Semiconductor quantum dots
Colloidal quantum dots
Color rendering index
Conventional light sources
Power conversion efficiencies
White lightemitting diodes (WLEDs)
Light emitting diodes
Published Version (Please cite this version)http://dx.doi.org/10.1515/nanoph-2014-0016
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