Efficient and stable laser-driven white lighting | Zendy

Kristin A. Denault | Zendy; Michael Cantore | Zendy; Shuji Nakamura | Zendy; Steven P. DenBaars | Zendy; Ram Seshadri | Zendy

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Efficient and stable laser-driven white lighting

Author(s) -

Kristin A. Denault,

Michael Cantore,

Shuji Nakamura,

Steven P. DenBaars,

Ram Seshadri

Publication year - 2013

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4813837

Subject(s) - color rendering index , laser , materials science , luminous efficacy , yttrium , luminous flux , blue laser , diode , optics , color temperature , phosphor , optoelectronics , diode pumped solid state laser , cerium , laser power scaling , light source , physics , nanotechnology , oxide , layer (electronics) , metallurgy

Laser-based white lighting offers a viable option as an efficient and color-stable high-power solid-state white light source. We show that white light generation is possible using blue or near-UV laser diodes in combination with yellow-emitting cerium-substituted yttrium aluminum garnet (YAG:Ce) or a mixture of red-, green-, and blue-emitting phosphors. A variety of correlated color temperatures (CCT) are achieved, ranging from cool white light with a CCT of 4400 K using a blue laser diode to a warm white light with a CCT of 2700 K using a near-UV laser diode, with respective color rendering indices of 57 and 95. The luminous flux of these devices are measured to be 252 lm and 53 lm with luminous efficacies of 76 lm/W and 19 lm/W, respectively. An estimation of the maximum efficacy of a device comprising a blue laser diode in combination with YAG:Ce is calculated and the results are used to optimize the device

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