| Autor: |
Krishnan R; Department of Physics, University of the Free State, Bloemfontein, 9301, South Africa. krishnanrphy@gmail.com swarthc@ufs.ac.za., Menon SG, Poelman D, Kroon RE, Swart HC |
| Jazyk: |
angličtina |
| Zdroj: |
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2021 Jan 07; Vol. 50 (1), pp. 229-239. Date of Electronic Publication: 2020 Dec 09. |
| DOI: |
10.1039/d0dt03081c |
| Abstrakt: |
A Yb 3+ free self-sensitized Er 2 WO 6 phosphor has been synthesized via a solid-state reaction method. The phosphor material, Er 2 WO 6 , has a monoclinic crystal structure with space group P2/c (13). The deconvoluted high-resolution X-ray photoelectron spectra of all the core elements in the Er 2 WO 6 phosphor material were explored. The highly resolved absorption peaks in the ultra-violet, visible and near-infra-red (NIR) regions of the diffuse reflectance spectrum were due to the Stark-splitting of the 4f energy levels of the Er 3+ ions. Under 980 nm NIR laser excitation, the Er 2 WO 6 phosphor showed an intense up-converted red emission at 677 nm due to the 4 F 9/2 → 4 I 15/2 transitions of the Er 3+ ions. The cross-relaxation and resonance energy transfer process involved in the key intermediate 4 F 3/2 and 4 F 5/2 levels of the Er 3+ and their role in generating red emissions were investigated. The laser pump power versus upconversion intensity plot showed a slope with an n value <1 and the possible reasons behind this behavior were investigated. The photoluminescence properties of the Er 2 WO 6 phosphor in the visible and NIR region were further analyzed. The potential application of the phosphor as a marker in latent fingerprint detection was also evaluated. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
