Abstract
We have measured photoluminescence (PL) and broadband reflection spectra of the surface of an opal photonic crystal (OPC) filled with terbium nitrate hexahydrate (TNH). The excitation sources used were a halogen lamp, lasers with emission wavelengths of 266 and 337 nm, and semiconductor light-emitting diodes (369 and 385 nm). It has been shown that resonance excitation of the TNH (Tb(NO3)3 · 6H2O) filled OPC by pulsed laser light at a wavelength of 266 nm gives rise to superluminescence: an increase in the relative intensity of the 545-nm PL band, corresponding to the Tb3+ 5 D 4–7 F 5 transition. The efficiency of pumping the upper laser level of the OPC increases due to the increase in the density of photon states (Purcell effect) near the bandgap edge in the OPC. The lack of clear superluminescence under excitation by the other excitation sources is related to specific features of the absorption of incident light by the rare-earth ion and to the low output power of the cw light sources.
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Original Russian Text © V.S. Gorelik, L.S. Lepnev, A.O. Litvinova, 2017, published in Neorganicheskie Materialy, 2017, Vol. 53, No. 8, pp. 861–866.
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Gorelik, V.S., Lepnev, L.S. & Litvinova, A.O. Photoluminescence of terbium nitrate hexahydrate incorporated into pores of opal photonic crystals. Inorg Mater 53, 847–852 (2017). https://doi.org/10.1134/S0020168517080040
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DOI: https://doi.org/10.1134/S0020168517080040