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Angular emission properties of a layer of rare-earth based nanophosphors embedded in one-dimensional photonic crystal coatings
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Image of FIG. 1.
FIG. 1.

(Color online) Experimental set-up employed for the angular characterization for the emission. The source represented is the 532 nm laser and the sample is the resonator made of nanoparticles of SiO2 (dark layers) and TiO2 (light layers). The middle layer represents the nanophosphor layer.

Image of FIG. 2.
FIG. 2.

(Color online) Transmittance (light lines) and photoluminescence (dark lines) spectra of optical resonators whose cavity modes are centered at λc = 708 nm (a) and at λc = 742 nm (e). Their photoluminescence spectra collected at different angles are plotted in sets of graphs b, c, d and f, g, h, respectively. Vertical dashed lines indicate the position of the emission bands of the nanophosphors.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Extraction power in an escape cone of angle θ of emission bands centered at λB = 708 nm and λB = 655 nm measured from the resonator whose cavity mode is located at λC = 708 nm (PTOT (θ), dark and light dots, respectively) and for reference layers (Pref (θ), dark and light crosses, respectively). (b) Similar plot of PTOT (θ) and Pref (θ) vs θ from a resonator characterized by λC = 742 nm. Graphs in (c) and (d) show the experimental enhancement factors (PTOT (θ)/Pref (θ)) for these two resonators, respectively, using the same code to identify bands. Experimental curves are multiplied by a factor 4 and 5 for the resonator of (a) and (b), respectively. Theoretical curves obtained from Eq. (3) are plotted in Figs. 3(a)–3(d) as solid lines for both resonators and as dotted lines for references. Finally, (e) and (f) show the corresponding calculated polar emission patterns of bands λB = 708 nm (dark lobes) and λB = 655 nm (light lobes) as a function of the collection angle.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Angular emission properties of a layer of rare-earth based nanophosphors embedded in one-dimensional photonic crystal coatings