Vacuum-UV excitation and visible luminescence of nano-scale and micro-scale NaLnF(4):Pr3+ (Ln = Y, Lu)

Autor(en): Herden, Benjamin
Nordmann, Joerg
Komban, Rajesh
Haase, Markus 
Juestel, Thomas
Stichwörter: Materials Science; Materials Science, Multidisciplinary; Nano- and micro-scale particles; Optics; Polymorphism of NaLuF4 and NaYF4; PR3+; Synthesis of fluorides; Ternary fluorides; Trivalent praseodymium; VUV spectroscopy
Erscheinungsdatum: 2013
Herausgeber: ELSEVIER SCIENCE BV
Journal: OPTICAL MATERIALS
Volumen: 35
Ausgabe: 12
Startseite: 2062
Seitenende: 2067
Zusammenfassung: 
The UV-Vis luminescence of NaLnF(4):Pr3+ (Ln = Y, Lu) materials can be efficiently excited by vacuum UV radiation (VUV) such as the 172 nm emission of mercury-free Xe-discharge lamps. In this work, the optical properties of the cubic alpha-phase and the hexagonal beta-phase of NaLnF(4):Pr3+ (Ln = Y, Lu) powders are compared regarding particle sizes in the nano- and micrometer regime. Upon VUV excitation, the emission spectra of both crystal phases are found to be dominated by intraconfigurational [Xe]4f(2)-[Xe]4f(2) transitions, which is explained by the chemical properties of the ternary fluorides. Furthermore it is observed that the emission and excitation spectra of nano- and micro-scale powders are very similar, but that the luminescence intensity is affected by the average particle size. (C) 2013 Elsevier B.V. All rights reserved.
ISSN: 09253467
DOI: 10.1016/j.optmat.2013.05.020

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