A strategy to achieve efficient green-emission dual-mode luminescence of Yb 3+ , Er 3+ doped NaBiF 4
- PDF / 5,579,943 Bytes
- 9 Pages / 595.276 x 790.866 pts Page_size
- 93 Downloads / 191 Views
RARE METALS
ORIGINAL ARTICLE
A strategy to achieve efficient green-emission dual-mode luminescence of Yb3+, Er3+ doped NaBiF4 Jin-Hui Xie, Jue Wang, Gui-Hua Qiu, Xi-Bing Li, Wen-Tao Huang, Rui-Rong Zhang, Tong Lin, Li-Xi Wang, Qi-Tu Zhang*
Received: 10 January 2020 / Revised: 21 March 2020 / Accepted: 7 August 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A series of hexagonal phase NaBiF4: xYb3?, yEr3? were successfully synthesized by solvothermal method. The morphology, phase structure, up-conversion luminescence and down-conversion luminescence properties of Yb3? and Er3? doping concentration and the energy transfer mechanism were studied. It shows that the doping of Yb3? and Er3? does not cause the phase transition of NaBiF4, but influences its morphology. In the NaBiF4: Yb3?, Er3?, Yb3? can transfer energy with Er3?, enhancing up-conversion green emission. With Yb3? doping concentration increasing, the up-conversion red-green ratio will increase while the down-conversion intensity of the green emission decreases and that of the red emission increases. Considering the potential application of NaBiF4: xYb3?, yEr3? phosphors in optical illumination, the thermal stability was carried out. Keywords NaBiF4; Dual-mode luminescence; Energy transfer; High temperature fluorescence
J.-H. Xie, J. Wang, X.-B. Li, W.-T. Huang, T. Lin, L.-X. Wang, Q.-T. Zhang* College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China e-mail: [email protected] J.-H. Xie, J. Wang, X.-B. Li, W.-T. Huang, T. Lin, L.-X. Wang, Q.-T. Zhang Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing 210009, China G.-H. Qiu, R.-R. Zhang Shandong Institute of Non-metallic Material, Jinan 250031, China
1 Introduction Upconversion luminescence (UCL) is the process of emitting higher energy photons after absorbing two or more low-energy near-infrared photons belonging to antiStokes fluorescence [1–3]. Rare earth doped NaReF4 phosphors have evoked considerable attention in such fields as optical illumination, near-infrared detection and biometric calibration [4–7] due to their fascinating features like low background fluorescence, low penetration depth, low toxicity, and resistance to photodamage and photobleaching [8–11]. Among them, the UCL phosphors used in bioimaging [12] are mainly composed of sensitizers such as Yb3?, Nd3?, activators like Er3?, Tm3? and matrix such as fluorides and oxides. The UCL phosphors increase the UC intensity and develop a monochromatic phosphors located within the biological window at the emission peak position [13–16]. UCL phosphors also have certain limitations. For example, due to surface defects and vibrational activity of ligands, their quantum efficiency is low and fluorescence intensity is weak. Defects and vibrations cause non-radiative energy loss, which ultimately leads to the quenching of fluorescence [17]. Kraemer et al. [18] synthesized Er3?/Tm3? and Yb3? co-doped NaYF4 ph
Data Loading...
