Effect of light scattering on upconversion photoluminescence quantum yield in microscale-to-nanoscale materials

Callum M. S. Jones, Nikita Panov, Artiom Skripka, Joseph Gibbons, Fabian Hesse, Jan-Willem G. Bos, Xiangfu Wang, Fiorenzo Vetrone, Guanying Chen, Eva Hemmer, Jose Marques-Hueso

Research output: Contribution to journalArticle

Abstract

Scattering affects excitation power density, penetration depth and upconversion emission self-absorption, resulting in particle size–dependent modifications of the external photoluminescence quantum yield (ePLQY) and net emission. Micron-size NaYF4:Yb3+, Er3+ encapsulated phosphors (∼4.2 µm) showed ePLQY enhancements of >402%, with particle-media refractive index disparity (∆n): 0.4969, and net emission increases of >70%. In sub-micron phosphor encapsulants (∼406 nm), self-absorption limited ePLQY and emission as particle concentration increases, while appearing negligible in nanoparticle dispersions (∼31.8 nm). These dependencies are important for standardising PLQY measurements and optimising UC devices, since the encapsulant can drastically enhance UC emission.

Original languageEnglish
Pages (from-to)22803-22818
Number of pages16
JournalOptics Express
Volume28
Issue number15
Early online date16 Jul 2020
DOIs
Publication statusPublished - 20 Jul 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Jones, C. M. S., Panov, N., Skripka, A., Gibbons, J., Hesse, F., Bos, J-W. G., Wang, X., Vetrone, F., Chen, G., Hemmer, E., & Marques-Hueso, J. (2020). Effect of light scattering on upconversion photoluminescence quantum yield in microscale-to-nanoscale materials. Optics Express, 28(15), 22803-22818. https://doi.org/10.1364/OE.398353