An integrated first principles and experimental investigation of the relationship between structural rigidity and quantum efficiency in phosphors for solid state lighting
2016; Elsevier BV; Volume: 179; Linguagem: Inglês
10.1016/j.jlumin.2016.07.006
ISSN1872-7883
AutoresJungmin Ha, Zhenbin Wang, Ekaterina Novitskaya, G.A. Hirata, Olivia A. Graeve, Shyue Ping Ong, Joanna McKittrick,
Tópico(s)Advanced Photocatalysis Techniques
ResumoWe outline an integrated approach for exploring novel near-UV excited phosphors. To test the hypothesis of whether high host structural rigidity results in phosphors with high quantum efficiency (Φ), we calculated the Debye temperatures (Θ) for 27 host materials using density functional theory calculations. We identified Eu2+-activated Ca7Mg(SiO4)4 and CaMg(SiO3)2 as having a relatively high Θ=601 K and 665 K, respectively, and predicted excitation energies of 3.18 eV (337 nm) and 3.29 eV (377 nm), respectively, both of which are in good agreement with the results of photoluminescence spectroscopy. However, the measured Φ for these two phosphors was < 30%, which indicates that Θ alone is not a sufficient condition for a high Φ. This work demonstrates the potential of combined first-principles calculations and experiments in the discovery and design of novel near-UV excited phosphors.
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