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United States Patent | 3,599,109 |
Guggenheim , et al. | August 10, 1971 |
Light output in the visible spectrum results from up conversion of infrared radiation within a composition illustrated by erbium-doped BaYbF.sub.5. The composition may be used as a coating on an infrared-emitting GaAs diode.
Inventors: | Guggenheim; Howard J. (Somerville, NJ), Johnson; Leo F. (Bedminister, NJ) |
Assignee: |
Bell Telephone Laboratories Incorporated
(Murray Hill,
NJ)
|
Appl. No.: | 04/816,734 |
Filed: | April 16, 1969 |
Current U.S. Class: | 372/41 ; 250/458.1; 250/459.1; 252/301.4H; 252/301.4R; 372/68 |
Current International Class: | H01S 3/0915 (20060101); C09K 11/77 (20060101); G02F 2/02 (20060101); G02F 2/00 (20060101); H01S 3/16 (20060101); H01S 3/0933 (20060101); H01s 003/16 () |
Field of Search: | 331/94.5 250/71,80 252/301.4 |
3380926 | April 1968 | Harper |
3480877 | November 1969 | Dillon, Jr. et al. |
3495893 | February 1970 | Geusic et al. |