(La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er)
| Title: | (La0.97RE0.01Yb0.02)2O2S Nanophosphors Converted from Layered Hydroxyl Sulfate and Investigation of Upconversion Photoluminescence (RE=Ho, Er) |
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| Authors: | Ji-Guang Li, Xuejiao Wang, Weigang Liu, Qi Zhu, Xiaodong Li, Xudong Sun |
| Source: | Nanoscale Research Letters, Vol 12, Iss 1, Pp 1-8 (2017) |
| Publisher Information: | SpringerOpen, 2017. |
| Publication Year: | 2017 |
| Collection: | LCC:Materials of engineering and construction. Mechanics of materials |
| Subject Terms: | Upconversion photoluminescence, Oxysulfide, Layered hydroxyl sulfate, Materials of engineering and construction. Mechanics of materials, TA401-492 |
| More Details: | Abstract Phase-pure (La0.97RE0.01Yb0.02)2O2S 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 Ho3+-doped phosphor exhibited green (medium), red (weak), and near-infrared (strong) emissions at ~ 546 (5F4 → 5I8), 658 (5F7 → 5I8), and 763 nm (5F4 → 5I7), respectively, and has the stable chromaticity coordinates of about (0.30, 0.66) in the visible-light region (400–700 nm). The Er3+-doped UC phosphor, on the other hand, showed weak green (~ 527/549 nm, 2H11/2,4S3/2 → 4I15/2), weak red (~668/672 nm, 4F9/2 → 4I15/2), and strong near-infrared (~ 807/58 nm, 4I9/2 → 4I15/2) 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. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1931-7573 1556-276X |
| Relation: | http://link.springer.com/article/10.1186/s11671-017-2277-4; https://doaj.org/toc/1931-7573; https://doaj.org/toc/1556-276X |
| DOI: | 10.1186/s11671-017-2277-4 |
| Access URL: | https://doaj.org/article/da4c770a8c014654b5fb90ceb939f7f6 |
| Accession Number: | edsdoj.4c770a8c014654b5fb90ceb939f7f6 |
| Database: | Directory of Open Access Journals |
| ISSN: | 19317573 1556276X |
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| DOI: | 10.1186/s11671-017-2277-4 |
| Published in: | Nanoscale Research Letters |
| Language: | English |