## Comprehensive
Rate Equation Analysis of Upconversion Luminescence Enhancement Due
to BaCl_{2} Nanocrystals in Neodymium-Doped Fluorozirconate-Based
Glass Ceramics

journal contribution

posted on 19.06.2014 by U. Skrzypczak, C. Pfau, G. Seifert, S. Schweizer#### journal contribution

Any type of content formally published in an academic journal, usually following a peer-review process.

In neodymium-doped fluorozirconate-based
glasses, a huge increase of up to a factor of 20 of the Nd

^{3+}photoemission is possible by the introduction of BaCl_{2}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 BaCl_{2}nanocrystals is confirmed as the key reason for (upconversion) emission enhancement in the fluorozirconate-based glass ceramics.#### Read the peer-reviewed publication

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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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#### Read the peer-reviewed publication

### Categories

### Keyword(s)

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