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Analysis of upconversion nanoparticles as an active medium for upconversion light sources

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationProceedings of SPIE
Subtitle of host publicationOptical Components and Materials XVI
PublisherS P I E - International Society for Optical Engineering
Number of pages9
ISBN (Print)9781510624702
Publication statusPublished - 1 Mar 2019
Publication typeA4 Article in a conference publication
EventSPIE Photonics West 2019 - San Francisco, United States
Duration: 2 Feb 20198 Feb 2019

Publication series

NameProceedings of SPIE : the International Society for Optical Engineering
PublisherSPIE, The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceSPIE Photonics West 2019
CountryUnited States
CitySan Francisco


In the presented work, we investigated the optical and thermal stability of upconversion nanoparticles based on the three widely used matrices (NaYF4, Y2O3, LaF3). Analysis of the upconversion emission as a function of pump power density in a wide range revealed a multi-stage functional dependence. The stages of linear growing, saturation and degradation with both reversible and irreversible characters were discovered. For matrices of nanoparticles with low-temperature stability (NaYF4), the dependence proves to be irreversible that could cause by a change in the structure and chemical composition of the matrix. Reversible dependence occurs in matrices with high-temperature stability (Y2O3 and LaF3) and is caused by multiphonon nonradiative relaxation, which can be temperature-stimulated because of self-heating and low air-cooling of the crystal matrixes with low thermal conductivity.


  • upconversion, nanoparticles, luminescence, erbium, ytterbium, light sources

Publication forum classification

Field of science, Statistics Finland

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