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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 18 — Sep. 15, 2013
  • pp: 3612–3615

Light-spectrum modification of warm white-light-emitting diodes with 3D colloidal photonic crystals to approximate candlelight

Chun-Feng Lai, Cheng-Liang Hsieh, and Chia-Jung Wu  »View Author Affiliations

Optics Letters, Vol. 38, Issue 18, pp. 3612-3615 (2013)

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This study presents the light-spectrum modification of warm white-light-emitting diodes ( w -WLEDs) with 3D colloidal photonic crystals (3D CPhCs) to approximate candlelight. The study measures the angular-resolved transmission properties of the w -WLEDs with CPhCs, which exhibit photonic stop bands based on the CPhC photonic band structures. The w -WLEDs with 3D CPhCs produce a low correlated color temperature of 1963 K, a high color-rendering index of 85, and a luminous flux of 22.8 lm (four times that of a candle). This study presents the successful development of a novel low-cost technique to produce candlelight w -WLEDs for use as an indoor light source.

© 2013 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.5298) Optical devices : Photonic crystals

ToC Category:
Optical Devices

Original Manuscript: July 3, 2013
Revised Manuscript: August 17, 2013
Manuscript Accepted: August 17, 2013
Published: September 10, 2013

Chun-Feng Lai, Cheng-Liang Hsieh, and Chia-Jung Wu, "Light-spectrum modification of warm white-light-emitting diodes with 3D colloidal photonic crystals to approximate candlelight," Opt. Lett. 38, 3612-3615 (2013)

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