High luminous flux from single crystal phosphor-converted laser-based white lighting system

Handle URI:
http://hdl.handle.net/10754/598472
Title:
High luminous flux from single crystal phosphor-converted laser-based white lighting system
Authors:
Cantore, Michael; Pfaff, Nathan; Farrell, Robert M.; Speck, James S.; Nakamura, Shuji; DenBaars, Steven P.
Abstract:
The efficiency droop of light emitting diodes (LEDs) with increasing current density limits the amount of light emitted per wafer area. Since low current densities are required for high efficiency operation, many LED die are needed for high power white light illumination systems. In contrast, the carrier density of laser diodes (LDs) clamps at threshold, so the efficiency of LDs does not droop above threshold and high efficiencies can be achieved at very high current densities. The use of a high power blue GaN-based LD coupled with a single crystal Ce-doped yttrium aluminum garnet (YAG:Ce) sample was investigated for white light illumination applications. Under CW operation, a single phosphor-converted LD (pc-LD) die produced a peak luminous efficacy of 86.7 lm/W at 1.4 A and 4.24 V and a peak luminous flux of 1100 lm at 3.0 A and 4.85 V with a luminous efficacy of 75.6 lm/W. Simulations of a pc-LD confirm that the single crystal YAG:Ce sample did not experience thermal quenching at peak LD operating efficiency. These results show that a single pc-LD die is capable of emitting enough luminous flux for use in a high power white light illumination system.
Citation:
Cantore M, Pfaff N, Farrell RM, Speck JS, Nakamura S, et al. (2015) High luminous flux from single crystal phosphor-converted laser-based white lighting system. Optics Express 24: A215. Available: http://dx.doi.org/10.1364/oe.24.00a215.
Publisher:
The Optical Society
Journal:
Optics Express
KAUST Grant Number:
SB140014
Issue Date:
14-Dec-2015
DOI:
10.1364/oe.24.00a215
Type:
Article
ISSN:
1094-4087
Sponsors:
This work was supported by the KACST(SB140013)-KAUST(SB140014)-UCSB Solid State Lighting Program (SSLP) and the Solid State Lighting & Energy Electronics Center. A portion of this work was done in the UCSB nanofabrication facility, part of the NSF NNIN network (ECS-0335765), as well as the UCSB Materials Research Lab, which is supported by the NSF MRSEC program (DMR-1121053).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorCantore, Michaelen
dc.contributor.authorPfaff, Nathanen
dc.contributor.authorFarrell, Robert M.en
dc.contributor.authorSpeck, James S.en
dc.contributor.authorNakamura, Shujien
dc.contributor.authorDenBaars, Steven P.en
dc.date.accessioned2016-02-25T13:21:20Zen
dc.date.available2016-02-25T13:21:20Zen
dc.date.issued2015-12-14en
dc.identifier.citationCantore M, Pfaff N, Farrell RM, Speck JS, Nakamura S, et al. (2015) High luminous flux from single crystal phosphor-converted laser-based white lighting system. Optics Express 24: A215. Available: http://dx.doi.org/10.1364/oe.24.00a215.en
dc.identifier.issn1094-4087en
dc.identifier.doi10.1364/oe.24.00a215en
dc.identifier.urihttp://hdl.handle.net/10754/598472en
dc.description.abstractThe efficiency droop of light emitting diodes (LEDs) with increasing current density limits the amount of light emitted per wafer area. Since low current densities are required for high efficiency operation, many LED die are needed for high power white light illumination systems. In contrast, the carrier density of laser diodes (LDs) clamps at threshold, so the efficiency of LDs does not droop above threshold and high efficiencies can be achieved at very high current densities. The use of a high power blue GaN-based LD coupled with a single crystal Ce-doped yttrium aluminum garnet (YAG:Ce) sample was investigated for white light illumination applications. Under CW operation, a single phosphor-converted LD (pc-LD) die produced a peak luminous efficacy of 86.7 lm/W at 1.4 A and 4.24 V and a peak luminous flux of 1100 lm at 3.0 A and 4.85 V with a luminous efficacy of 75.6 lm/W. Simulations of a pc-LD confirm that the single crystal YAG:Ce sample did not experience thermal quenching at peak LD operating efficiency. These results show that a single pc-LD die is capable of emitting enough luminous flux for use in a high power white light illumination system.en
dc.description.sponsorshipThis work was supported by the KACST(SB140013)-KAUST(SB140014)-UCSB Solid State Lighting Program (SSLP) and the Solid State Lighting & Energy Electronics Center. A portion of this work was done in the UCSB nanofabrication facility, part of the NSF NNIN network (ECS-0335765), as well as the UCSB Materials Research Lab, which is supported by the NSF MRSEC program (DMR-1121053).en
dc.publisherThe Optical Societyen
dc.titleHigh luminous flux from single crystal phosphor-converted laser-based white lighting systemen
dc.typeArticleen
dc.identifier.journalOptics Expressen
dc.contributor.institutionMaterials Department, University of California, Santa Barbara, California 93106, USAen
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of California, Santa Barbara, California 93117, USAen
kaust.grant.numberSB140014en
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