{"id":332747,"date":"2016-12-07T03:00:00","date_gmt":"2016-12-07T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=d5b137320e27279d4c779816a3fcd660"},"modified":"2016-12-07T03:00:00","modified_gmt":"2016-12-07T00:00:00","slug":"the-photoluminescence-of-a-fluorescent-lamp-didactic-experiments-on-the-exponential-decay","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=332747","title":{"rendered":"The photoluminescence of a fluorescent lamp: didactic experiments on the exponential decay"},"content":{"rendered":"<p>The lifetimes of the photoluminescent compounds contained in the coating of fluorescent compact<br \/>\nlamps are usually measured using specialised instruments, including pulsed lasers and\/or<br \/>\nspectrofluorometers. Here we discuss how some low cost apparatuses, based on the use of either<br \/>\nsensors for the educational lab or commercial digital photo cameras, can be employed to the same<br \/>\naim. The experiments do not require that luminescent phosphors are hazardously extracted from the<br \/>\ncompact fluorescent lamp, that also contains mercury. We obtain lifetime measurements for specific<br \/>\nfluorescent elements of the bulb coating, in good agreement with the known values. We also address<br \/>\nthe physical mechanisms on which fluorescence lamps are based in a simplified way, suitable for<br \/>\nundergraduate students; and we discuss in detail the physics of the lamp switch-off by analysing the<br \/>\ntime dependent spectrum, measured through a commercial fiber-optic spectrometer. Since the<br \/>\nexperiment is not hazardo&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The lifetimes of the photoluminescent compounds contained in the coating of fluorescent compact<br \/>\nlamps are usually measured using specialised instruments, including pulsed lasers and\/or<br \/>\nspectrofluorometers. Here we discuss how some low cost apparatuse&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-332747","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/332747","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=332747"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/332747\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=332747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=332747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=332747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}