Determination of the complex refractive index of powder phosphors

Solodovnyk A, Riedel D, Lipovšek B, Osvet A, Gast J, Stern E, Forberich K, Batentschuk M, Krč J, Topič M, Brabec C (2017)


Publication Language: English

Publication Type: Journal article

Publication year: 2017

Journal

Book Volume: 7

Journal Issue: 8

URI: https://www.osapublishing.org/DirectPDFAccess/5EEDD78A-F755-8C8B-A1EDFAA1B745C1D1_370046/ome-7-8-2943.pdf?da=1&id=370046&seq=0&mobile=no

DOI: 10.1364/OME.7.002943

Abstract

We demonstrate a novel 2-step method to precisely determine both n and k of phosphors, luminescent inorganic particles, in the visible spectrum. To measure n we modified the Becke Line immersion method and verified its applicability in the absorption/ emission regions of phosphor particles (step 1). Particles were then embedded into a transparent binder and coated in thick layers (100-500 μm) on glass. Absorptance of the layers was measured with a novel approach: spectral angular resolved measurements. This method delivers accurate results by avoiding any errors from intense scattering inside the layers. A computational model was employed to extract k of particles from the measured absorptance data taking into account luminescence, scattering and re-absorption (step 2). The entire method was verified on reference materials. Finally, based on the proposed method, we determined in a broad wavelength range the n and k parameters for a variety of commonly used phosphors with few or no earlier reports on their n and k values (the complete set of numerical data is fully disclosed in the supplementary materials). © 2017 Optical Society of America.

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APA:

Solodovnyk, A., Riedel, D., Lipovšek, B., Osvet, A., Gast, J., Stern, E.,... Brabec, C. (2017). Determination of the complex refractive index of powder phosphors. Optical Materials Express, 7(8). https://dx.doi.org/10.1364/OME.7.002943

MLA:

Solodovnyk, Anastasiia, et al. "Determination of the complex refractive index of powder phosphors." Optical Materials Express 7.8 (2017).

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