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Local Heating from Silver Nanoparticles and Its Effect on the Er 3+ Upconversion in Oxyfluoride Glasses
Author(s) -
Liu Chao,
Heo Jong
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03890.x
Subject(s) - photon upconversion , nanoparticle , ion , materials science , excitation , analytical chemistry (journal) , absorption (acoustics) , emission intensity , laser , doping , nanotechnology , chemistry , optoelectronics , optics , composite material , physics , organic chemistry , engineering , chromatography , electrical engineering
The effect of silver (Ag) nanoparticles on the upconversion emission properties of Er 3+ ions in oxyfluoride glasses was investigated, and a mechanism of the energy transfer proposed. The integrated intensity ratios between 522 and 545 nm emission bands of Er 3+ ions in glasses containing Ag nanoparticles were strongly dependent on the size of the Ag nanoparticles as well as on the intensity of the 800 nm excitation laser. When the absorption of Ag nanoparticles overlapped with the 2 H 11/2 and 4 S 3/2 energy levels in Er 3+ ions, a strong energy transfer occurred from Er 3+ : 2 H 11/2 , 4 S 3/2 levels to Ag nanoparticles. This energy was then converted to a temperature rise in the vicinity of Er 3+ ions, eventually leading to the large increase in the integrated intensity ratios. The estimated effective temperature was approximately 200 K higher than the experimental temperature when the excitation power was 700 mW.