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Title: Investigation of sensitizer ions tunable-distribution in fluoride nanoparticles for efficient accretive three-center energy transfer

Cooperative upconversion luminescence of Yb³⁺-Yb³⁺ couples and three-center energy transfer mechanisms have been deeply investigated in Yb³⁺ doped and Yb³⁺-Tb³⁺ co-doped β-PbF₂ nanoparticles. As sensitizer ions, the distribution of Yb³⁺ ions, which is a key factor that affects the cooperative upconversion luminescence and three-center energy transfer processes, can be tuned by the structure of nanoparticles. Based on the three-center distributions in tetragonal PbYb{sub x}Tb{sub 1–x}F₅ nanoparticles, two different energy transfer models, Cooperative Energy Transfer (CET) and Accretive Energy Transfer (AET) mechanisms were established. Especially, AET model is observed and verified in this work for the first time. Experimental results obtained from photoluminescence spectroscopy study are in agreement with the theoretical calculations by applying rate equations in these models, strongly supporting the proposed three-center energy transfer mechanisms. The sensitization between Yb³⁺ ions only existing in AET process can greatly improve the energy transfer rates, further to enhance the quantum efficiency. The results that the calculated luminescence quantum efficiency in AET quantum cutting process is much higher than that in CET process (134% and 104%, respectively), can benefit for further increasing the conversion efficiency of c-Si solar cells.
Authors:
; ; ; ; ; ; ;  [1]
  1. The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics and Applied Physics Institute, Nankai University, Tianjin 300071 (China)
Publication Date:
OSTI Identifier:
22305935
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; COMPUTERIZED SIMULATION; CONVERSION; CRYSTALS; CUTTING; DOPED MATERIALS; ENERGY TRANSFER; LEAD FLUORIDES; NANOPARTICLES; PHOTOLUMINESCENCE; QUANTUM EFFICIENCY; SILICON; SOLAR CELLS; SPECTROSCOPY; TERBIUM ADDITIONS; YTTERBIUM ADDITIONS