Rare earth halide light source with enhanced red emission

Details Rare earth halide light source with enhanced red emission Rare earth halide light source with enhanced red emission

1987-10-23

1989-01-31

Moore, David K.

Electric lamp and discharge devices

With gas or vapor

With particular gas or vapor

313640, H01J 6122

Patent

active

048018465

ABSTRACT:
This invention teaches a novel high pressure electric discharge lamp which has the desired properties of high efficacy, good color rendering, and a warm color temperature. These desired properties are attained by utilizing as fills the rare earth iodides in conjunction with calcium halides and, or sodium halides. Efficient visible emission from the rare earth atomic and molecular fragments in the discharge is combined with the red emission from calcium monohalide to provide an efficient, warm source.

REFERENCES:
patent: 3319119 (1967-05-01), Rendina
patent: 3654506 (1972-04-01), Kuhl et al.
patent: 3798487 (1974-03-01), Zollweg et al.
patent: 3852630 (1974-12-01), Wesselink et al.
patent: 4027190 (1977-05-01), Shintani et al.
patent: 4029425 (1977-05-01), Higashi et al.
patent: 4171498 (1979-10-01), Fromm et al.
patent: 4178534 (1979-12-01), McNeill et al.
patent: 4243906 (1981-01-01), Wilson
patent: 4360758 (1982-11-01), Thornton et al.
N. J. Caruso, An Improved Metal Halide Lamp with High Color Rendering Properties, Journal of IES Transaction, pp. 206-219, Oct. 1983, discusses metal halide lamps utilizing iodides and bromides such as tin, calcium, and thallium iodides.
W. A. McAllister, Color and Efficiency of Neodymium Iodide Discharges, Journal Electrochem. Soc.: Solid State Science and Technology, pp. 2798-2800, Nov. 1985 discusses atomic radiation from a number of metals, added as iodides to high intensity mercury discharge arc tubes. He specifically discusses the iodides of neodymium and cesium.
R. W. B. Pearse, The Identification of Molecular Spectra, Fourth Edition, Chapman and Hall, pp. 128-129, (1965) discusses the identification of molecular spectra specifically calcium iodide.

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