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Comprehensive Rate Equation Analysis of Upconversion Luminescence Enhancement Due to BaCl2 Nanocrystals in Neodymium-Doped Fluorozirconate-Based Glass Ceramics
journal contribution
posted on 2014-06-19, 00:00 authored by U. Skrzypczak, C. Pfau, G. Seifert, S. SchweizerIn neodymium-doped fluorozirconate-based
glasses, a huge increase of up to a factor of 20 of the Nd3+ photoemission is possible by the introduction of BaCl2 nanocrystals. A rate equation system was developed to describe the
excitation and relaxation dynamics of neodymium ions in such composite
matrix to quantify the enhancement mechanism due to the embedded nanocrystals.
The model is extended to include the previously unknown quantitative
nanocrystal influences in an effective-medium model, considering the
change in the phonon spectrum in particular. Having verified the coefficients
with time-dependent photoluminescence experiments, it is used to predict
the intensity dependence of steady-state upconversion. The good agreement
with experimental data indicates that the rate equations enable the
quantitative simulation of photon upconversion in glass and glass
ceramics under a variety of excitation scenarios. In addition, the
strong reduction of the phonon emission probability in the BaCl2 nanocrystals is confirmed as the key reason for (upconversion)
emission enhancement in the fluorozirconate-based glass ceramics.
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rate equationsenhancement mechanismexcitation scenariosphoton upconversionemission enhancementBaCl 2 Nanocrystalsphonon emission probabilityUpconversion Luminescence EnhancementComprehensive Rate Equation Analysisglass ceramicsintensity dependencerelaxation dynamicsrate equation systemnanocrystal influencesphonon spectrumBaCl 2 nanocrystalsneodymium ionsmodel
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