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Measuring phosphorescence energy flux

Petra Šter (2017) Measuring phosphorescence energy flux. MSc thesis.

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    Abstract

    Phosphorescence is a phenomenon in which a substance absorbs some light and over some time emits it with a forbidden transition. These transitions have very low probability and are therefore fairly rare. Phosphorescence produces a small but a long persistent light flux. In this master thesis I focus on the problem of measuring light flux, the efficiency of absorption and the measurement of the maximum of absorbed energy. Based on the measured central wavelength I calculate the density of active states. I carry out measurements on two samples of phosphorescent objects. For all experiments I use a simple measuring method, based on a digital camera, which is appropriate for measuring small light fluxes. This thesis can also be useful for teaching physics in school because the phenomenon of phosphorescence can be explained as storing of light energy. Furthermore, the measuring method can be applied to other experiments with light which are relevant for school. As an example I measure the light flux from the last quarter of Moon and from the almost full Moon, as well as the light energy which the flash emits. I compare these measurements with theoretical values. Based on these comparisons I analyse advantages and possible disadvantages of using the digital camera as a measuring instrument.

    Item Type: Thesis (MSc thesis)
    Keywords: phosphorescence, energy density, decay of light flux, efficiency of absorption, density of active states, digital camera, Moon, flashlight
    Number of Pages: 63
    Language of Content: Slovenian
    Mentor / Comentors:
    Mentor / ComentorsIDFunction
    izr. prof. dr. Bojan GolliMentor
    doc. dr. Gregor BavdekComentor
    Link to COBISS: http://www.cobiss.si/scripts/cobiss?command=search&base=50126&select=(ID=11899977)
    Institution: University of Ljubljana
    Department: Faculty of Education
    Item ID: 4952
    Date Deposited: 22 Jan 2018 14:36
    Last Modified: 22 Jan 2018 14:36
    URI: http://pefprints.pef.uni-lj.si/id/eprint/4952

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