A Characteristic Example of Re-trapping in Phosphorescence

Details A Characteristic Example of Re-trapping in Phosphorescence A Characteristic Example of Re-trapping in Phosphorescence

Jul 1950

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1950natur.166...70c&link_type=abstract

Nature, Volume 166, Issue 4210, pp. 70 (1950).

Computer Science

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Scientific paper

THERE has been much discussion about the existence of re-trapping (electronic recapture) in phosphorescence1. One of my experiments seems to demonstrate the existence of re-trapping: electrons leave the deep traps and get into the short-life traps. I used a calcium sulphide, (bismuth activator) phosphor of very long afterglow. This sulphide was strongly excited by ultra-violet radiations of about 0.36 µ from a mercury vapour arc; it was then heated up to 135° C. until complete extinction was reached. When the sulphide had cooled down to room temperature, it was submitted to the infra-red radiations of a 300-W. electric lamp filtered by a black manganese-iron glass with transparent range of 0.8 µ-4µ with some peaks between 1 µ and 4 µ.

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