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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S5 — Sep. 9, 2013
  • pp: A765–A773

Polarized white light from LEDs using remote-phosphor layer sandwiched between reflective polarizer and light-recycling dichroic filter

Ji Hye Oh, Su Ji Yang, Young Rag, and Do  »View Author Affiliations


Optics Express, Vol. 21, Issue S5, pp. A765-A773 (2013)
http://dx.doi.org/10.1364/OE.21.00A765


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Abstract

This study introduces an efficient polarized, white phosphor-converted, light-emitting diode (pc-LED) using a remote phosphor film sandwiched between a reflective polarizer film (RPF) and a short-wavelength pass dichroic filter (SPDF). The on-axis brightness of polarized white light emission of a RPF/SPDF-sandwiched phosphor film over a blue LED, showed greater recovery than that of a conventional unpolarized remote phosphor film over blue LED, due to the recycling effect of yellow light from an SPDF. The relative luminous efficacy of an RPF/SPDF-sandwiched phosphor film was made 1.40 times better by adding an SPDF on the backside of an RPF-capped phosphor film. A polarization ratio of 0.84 was demonstrated for a white LED with an RPF/SPDF-sandwiched phosphor film, in good agreement with the measured results from the RPF-only sample.

© 2013 OSA

OCIS Codes
(220.0220) Optical design and fabrication : Optical design and fabrication
(230.0230) Optical devices : Optical devices
(230.1480) Optical devices : Bragg reflectors
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: April 9, 2013
Revised Manuscript: May 31, 2013
Manuscript Accepted: July 8, 2013
Published: July 15, 2013

Citation
Ji Hye Oh, Su Ji Yang, and Young Rag Do, "Polarized white light from LEDs using remote-phosphor layer sandwiched between reflective polarizer and light-recycling dichroic filter," Opt. Express 21, A765-A773 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-S5-A765


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