NDLI: Exploring the maximum efficiency in infrared-to-visible converting phosphors activated with Er and sensitized with Yb

Content Provider	IEEE Xplore Digital Library
Author	Rich, T.C. Pinnow, D.A.
Copyright Year	1971
Description	Author affiliation: Bell Telephone Labs, Inc., Murray Hill, N. J. (Rich, T.C.)
Abstract	Recently developed visible solid state light sources made by coating infrared light emitting diodes with infrared-to-visible converting phosphors appear technologically interesting. However, the maximum achievable performance of these devices has been uncertain since there was no accurate method for extrapolating the nonlinear characteristics of the phosphors. We have developed techniques for exploring the maximum possible efficiencies of these phosphors by exciting them with a tightly focused YA1G:Nd laser operating at 1.06µ. The results of a series of measurements on the brightest phosphor materials available indicate that the ultimate efficiencies are strongly dependent on the host crystal material. Of the materials we have examined, the most efficient hosts are barium yttium fluoride, BaYF5, and yttrium fluoride, YF3. The highest attainable efficiency of the latter, defined as the ratio of visible emitted power to incident infrared excitation power, is in excess of 24%. Based on these results and the known performance of GaAs infrared light emitting diodes, we conclude that the overall performance of infrared-to-visible converting phosphor-diode devices should be comparable to the direct visible emitting GaP devices.
Starting Page	78
Ending Page	78
File Size	85992
Page Count	1
File Format	PDF
DOI	10.1109/IEDM.1971.188401
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1971-10-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phosphors Erbium Crystalline materials Optical materials Light emitting diodes Solid state circuits Light sources Coatings Barium Yttrium
Content Type	Text
Resource Type	Article

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