(La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)

Phase-pure (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S upconversion (UC) nanophosphors (average crystallite size ~ 45 nm; RE=Ho, Er) were annealed from their hydrothermally crystallized layered hydroxyl sulfate precursors in flowing hydrogen at 1200 °C for 1 h, with water vapor as the only exhaust. Under 978...

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Autores principales: Li, Ji-Guang, Wang, Xuejiao, Liu, Weigang, Zhu, Qi, Li, Xiaodong, Sun, Xudong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5570760/
https://www.ncbi.nlm.nih.gov/pubmed/28840548
http://dx.doi.org/10.1186/s11671-017-2277-4
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author Li, Ji-Guang
Wang, Xuejiao
Liu, Weigang
Zhu, Qi
Li, Xiaodong
Sun, Xudong
author_facet Li, Ji-Guang
Wang, Xuejiao
Liu, Weigang
Zhu, Qi
Li, Xiaodong
Sun, Xudong
author_sort Li, Ji-Guang
collection PubMed
description Phase-pure (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S upconversion (UC) nanophosphors (average crystallite size ~ 45 nm; RE=Ho, Er) were annealed from their hydrothermally crystallized layered hydroxyl sulfate precursors in flowing hydrogen at 1200 °C for 1 h, with water vapor as the only exhaust. Under 978-nm laser excitation (up to 2.0 W), the Ho(3+)-doped phosphor exhibited green (medium), red (weak), and near-infrared (strong) emissions at ~ 546 ((5)F(4) → (5)I(8)), 658 ((5)F(7) → (5)I(8)), and 763 nm ((5)F(4) → (5)I(7)), respectively, and has the stable chromaticity coordinates of about (0.30, 0.66) in the visible-light region (400–700 nm). The Er(3+)-doped UC phosphor, on the other hand, showed weak green (~ 527/549 nm, (2)H(11/2),(4)S(3/2) → (4)I(15/2)), weak red (~668/672 nm, (4)F(9/2) → (4)I(15/2)), and strong near-infrared (~ 807/58 nm, (4)I(9/2) → (4)I(15/2)) luminescence, whose emission color in the visible region drifted from yellowish-green [(0.36, 0.61)] to green [(0.32, 0.64)] with increasing excitation power. Analysis of the power-dependent UC luminescence found three- and two-photon processes for RE=Ho and Er, respectively, and the possible UC mechanisms were proposed. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s11671-017-2277-4) contains supplementary material, which is available to authorized users.
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spelling pubmed-55707602017-09-11 (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er) Li, Ji-Guang Wang, Xuejiao Liu, Weigang Zhu, Qi Li, Xiaodong Sun, Xudong Nanoscale Res Lett Nano Express Phase-pure (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S upconversion (UC) nanophosphors (average crystallite size ~ 45 nm; RE=Ho, Er) were annealed from their hydrothermally crystallized layered hydroxyl sulfate precursors in flowing hydrogen at 1200 °C for 1 h, with water vapor as the only exhaust. Under 978-nm laser excitation (up to 2.0 W), the Ho(3+)-doped phosphor exhibited green (medium), red (weak), and near-infrared (strong) emissions at ~ 546 ((5)F(4) → (5)I(8)), 658 ((5)F(7) → (5)I(8)), and 763 nm ((5)F(4) → (5)I(7)), respectively, and has the stable chromaticity coordinates of about (0.30, 0.66) in the visible-light region (400–700 nm). The Er(3+)-doped UC phosphor, on the other hand, showed weak green (~ 527/549 nm, (2)H(11/2),(4)S(3/2) → (4)I(15/2)), weak red (~668/672 nm, (4)F(9/2) → (4)I(15/2)), and strong near-infrared (~ 807/58 nm, (4)I(9/2) → (4)I(15/2)) luminescence, whose emission color in the visible region drifted from yellowish-green [(0.36, 0.61)] to green [(0.32, 0.64)] with increasing excitation power. Analysis of the power-dependent UC luminescence found three- and two-photon processes for RE=Ho and Er, respectively, and the possible UC mechanisms were proposed. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s11671-017-2277-4) contains supplementary material, which is available to authorized users. Springer US 2017-08-24 /pmc/articles/PMC5570760/ /pubmed/28840548 http://dx.doi.org/10.1186/s11671-017-2277-4 Text en © The Author(s). 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Nano Express
Li, Ji-Guang
Wang, Xuejiao
Liu, Weigang
Zhu, Qi
Li, Xiaodong
Sun, Xudong
(La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)
title (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)
title_full (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)
title_fullStr (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)
title_full_unstemmed (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)
title_short (La(0.97)RE(0.01)Yb(0.02))(2)O(2)S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)
title_sort (la(0.97)re(0.01)yb(0.02))(2)o(2)s nanophosphors converted from layered hydroxyl sulfate and investigation of upconversion photoluminescence (re=ho, er)
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5570760/
https://www.ncbi.nlm.nih.gov/pubmed/28840548
http://dx.doi.org/10.1186/s11671-017-2277-4
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