Chemical sensors based on powdered phosphors

Manish Patel; Brandi Langsdorf; Lee R. Sharpe

doi:10.1117/12.190970

21 October 1994 Chemical sensors based on powdered phosphors

Manish Patel, Brandi Langsdorf, Lee R. Sharpe

Proceedings Volume 2293, Chemical, Biochemical, and Environmental Fiber Sensors VI; (1994) https://doi.org/10.1117/12.190970
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We have developed a method to prepare powdered phosphors which can serve as chemical sensors for a variety of gases. These sensors indicate the presence of the gas by changes in the photoluminescence (PL) intensity relative to N₂ as a reference gas. Specifically, we have found that the PL of the CdS:Te phosphor increases by as much as 50% when exposed to ammonia and decreases by 50% when exposed to sulfur dioxide. This phosphor also responds to a lesser degree to O₂ and water. We have also explored other common phosphors based on ZnS, Zn_xCd_1-xS, CaS, and SrS. The ZnS containing phosphors do not show any changes in PL upon exposure to either ammonia or sulfur dioxide while the CaS phosphors respond to sulfur dioxide and water.

Citation Download Citation

Manish Patel, Brandi Langsdorf, and Lee R. Sharpe "Chemical sensors based on powdered phosphors", Proc. SPIE 2293, Chemical, Biochemical, and Environmental Fiber Sensors VI, (21 October 1994); https://doi.org/10.1117/12.190970

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