Abstract

We report the implementation of a new, high brightness, high efficiency white-light source based on up-conversion phosphors. Up-conversion materials absorb near infrared light and re-emit in red, green, and blue. It is possible to combine these colors to create a white-light source. Such a source has the same appealing characteristics as those reported for up-conversion displays: very high brightness operation without damage to the emitters, long lifetimes, and efficiencies comparable to those of existing technologies. In addition, they offer simplicity of fabrication and a variety of operating modes. Here we demonstrate a 7-lm/W D65 white light emitter yielding 2 kcd/m<sup>2</sup> on a simple diffuser.

© 2006 IEEE

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S. L. Jacques, "Role of tissue optics and pulse duration on tissue effects during high-power laser irradiation," Appl. Opt. 32, 2447-2454 (1993).

Appl. Opt.

Appl. Phys. Lett.

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J. Appl. Phys.

A. Rapaport, J. Milliez, M. Bass, A. Cassanho, H. Jenssen, "Numerical model of the temperature dependence of the up-conversion efficiency of fluoride crystals codoped with ytterbium and thulium," J. Appl. Phys. 97, 123527-123527-6 (2005).

J. Display Technol.

A. J. Steckl, J. Heikenfeld, S. C. Allen, "Light wave coupled flat panel displays and solid-state lighting using hybrid inorganic/organic materials," J. Display Technol. 1, 157-166 (2005).

J. Opt. Soc. Amer. B (Opt. Phys.)

R. H. Page, K. I. Schaffers, P. A. Waide, J. B. Tassano, S. A. Payne, W. F. Krupke, W. K. Bischel, "Upconversion-pumped luminescence efficiency of rare-earth-doped hosts sensitized with trivalent ytterbium," J. Opt. Soc. Amer. B (Opt. Phys.) 15, 996-1008 (1998).

J. Appl. Phys.

Y. Mita, "Luminescence processes in Yb-sensitized rare-earth phosphors," J. Appl. Phys. 43, 1772-1778 (1972).

J. Display Technol.

Photon. Spectra

"SHEDS: The next revolution for the laser diode," Photon. Spectra 89-118 (2005).

Other

M. L. F. Phillips, M. P. Hehlen, K. Nguyen, J. M. Sheldon, N. J. Cockroft, "Upconversion phosphors: Recent advances and new applications," Proc. 8th Int. Symp. Phys. and Chem. of Luminesc. Mat. (Electrochem. Soc. Proc.) (1999) pp. 123-127.

D. Falk, D. Brill, D. Stork, Optics in Nature, Photography, Color, Vision and Holography (Wiley, 1986).

J. Milliez, A. Rapaport, F. Szipocs, M. Bass, A. Cassanho, H. Jenssen, "Up-conversion efficiency of potential candidates for photonic displays," SID'2003 Int. Symp. Dig. Tech. Papers (2003) pp. 1230-1233.

A. Rapaport, J. Milliez, M. Bass, A. Cassanho, H. Jenssen, "Review of the properties of up-conversion phosphors for new emissive displays," SID'2004 Int. Symp. Dig. Tech. Papers (2004) pp. 1237-1239.

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